subject:(Nanocomposites)

1. Liu, Huinan. Design, Fabrication and Evaluation of 2D to 3D nanostructured Ceramic/Polymer Composites for Orthopedic Regeneration and Controlled Drug Delivery.

Degree: PhD, Biomedical Engineering, 2008, Brown University

URL: https://repository.library.brown.edu/studio/item/bdr:237/

► Desirable cytocompatibility properties of nano-sized ceramics were combined with the tunable degradability and deformability of a select polymer (poly-lactide-co-glycolide, or PLGA) to optimize biological and… (more)

▼ Desirable cytocompatibility properties of nano-sized ceramics were combined with the tunable degradability and deformability of a select polymer (poly-lactide-co-glycolide, or PLGA) to optimize biological and mechanical properties for orthopedic tissue regeneration. Nanophase ceramics mimic the size scale of constituent components of natural bone and enhance the adsorption of proteins that mediate bone cell adhesion. Results have shown significantly promoted osteoblast (bone-forming cell) adhesion and long-term functions (alkaline phosphatase activity and calcium deposition) on nanophase ceramics compared to conventional (micron-scale) ceramics. Therefore, nano-titania particles were first dispersed in a model polymer (PLGA) matrix using sonication to imitate the nano-sized surface features and distribution of nano-ceramics in/on bone. Surface characteristics of the composites (such as topography, surface area and surface roughness) were studied. Importantly, results showed that osteoblast adhesion was the greatest when surface roughness values of the composites were closer to that of natural bone; this was mediated by controlling the dispersion of titania in PLGA. Moreover, this study demonstrated that the dispersion of nanophase titania in PLGA decreased the harmful acidic pH changes of PLGA as it degrades. From the perspective of mechanical properties, compared to agglomerated nano-titania in PLGA, well-dispersed nanophase titania in PLGA improved the tensile and compressive moduli and strength of these composites. In order to mimic the hierarchical structure of bone, a novel aerosol-based 3D printing technique was used to further fabricate nanostructured 3D ceramic/polymer composites. Osteoblast interactions with these 3D scaffolds provided evidence of an even further promoted bone cell infiltration into such 3D structures. Lastly, nanocomposites were used as novel drug delivery systems to promote bone growth. Specifically, a bone morphogenetic protein (BMP-7) derived peptide (DIF-7c) was loaded onto nanophase hydroxyapatite/PLGA composites by either covalent chemical attachment or physical adsorption. Results demonstrated that the model peptide was successfully immobilized onto nano-HA/PLGA composites using aminosilane chemistry. Moreover, a greater prolonged two-phase release profile was achieved using these nanocomposite-based drug delivery systems over single-phase (hydroxyapatite or PLGA) drug carriers. In summary, this dissertation demonstrated for the first time that nanophase ceramic/polymer composites are promising candidates as novel, drug-carrying orthopedic materials for more effective bone regeneration and bone disease treatment. Advisors/Committee Members: Webster, Thomas (director), Morgan, Jeffrey (reader), Mathiowitz, Edith (reader), Palmore, G. Tayhas (reader), Karp, Jeffrey (reader).

Subjects/Keywords: nanocomposites

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APA (6^th Edition):

Liu, H. (2008). Design, Fabrication and Evaluation of 2D to 3D nanostructured Ceramic/Polymer Composites for Orthopedic Regeneration and Controlled Drug Delivery. (Doctoral Dissertation). Brown University. Retrieved from https://repository.library.brown.edu/studio/item/bdr:237/

Chicago Manual of Style (16^th Edition):

Liu, Huinan. “Design, Fabrication and Evaluation of 2D to 3D nanostructured Ceramic/Polymer Composites for Orthopedic Regeneration and Controlled Drug Delivery.” 2008. Doctoral Dissertation, Brown University. Accessed February 22, 2020. https://repository.library.brown.edu/studio/item/bdr:237/.

MLA Handbook (7^th Edition):

Liu, Huinan. “Design, Fabrication and Evaluation of 2D to 3D nanostructured Ceramic/Polymer Composites for Orthopedic Regeneration and Controlled Drug Delivery.” 2008. Web. 22 Feb 2020.

Vancouver:

Liu H. Design, Fabrication and Evaluation of 2D to 3D nanostructured Ceramic/Polymer Composites for Orthopedic Regeneration and Controlled Drug Delivery. [Internet] [Doctoral dissertation]. Brown University; 2008. [cited 2020 Feb 22]. Available from: https://repository.library.brown.edu/studio/item/bdr:237/.

Council of Science Editors:

Liu H. Design, Fabrication and Evaluation of 2D to 3D nanostructured Ceramic/Polymer Composites for Orthopedic Regeneration and Controlled Drug Delivery. [Doctoral Dissertation]. Brown University; 2008. Available from: https://repository.library.brown.edu/studio/item/bdr:237/

2. Suresh Kumar, Danikonda. Preparation and characterization of graphene oxide reinforced thermophastic starch based green nanocomposites;.

Degree: 2015, Osmania University

URL: http://shodhganga.inflibnet.ac.in/handle/10603/42958

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Advisors/Committee Members: Madhukar, K.

Subjects/Keywords: Nanocomposites

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APA (6^th Edition):

Suresh Kumar, D. (2015). Preparation and characterization of graphene oxide reinforced thermophastic starch based green nanocomposites;. (Thesis). Osmania University. Retrieved from http://shodhganga.inflibnet.ac.in/handle/10603/42958

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Suresh Kumar, Danikonda. “Preparation and characterization of graphene oxide reinforced thermophastic starch based green nanocomposites;.” 2015. Thesis, Osmania University. Accessed February 22, 2020. http://shodhganga.inflibnet.ac.in/handle/10603/42958.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Suresh Kumar, Danikonda. “Preparation and characterization of graphene oxide reinforced thermophastic starch based green nanocomposites;.” 2015. Web. 22 Feb 2020.

Vancouver:

Suresh Kumar D. Preparation and characterization of graphene oxide reinforced thermophastic starch based green nanocomposites;. [Internet] [Thesis]. Osmania University; 2015. [cited 2020 Feb 22]. Available from: http://shodhganga.inflibnet.ac.in/handle/10603/42958.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Suresh Kumar D. Preparation and characterization of graphene oxide reinforced thermophastic starch based green nanocomposites;. [Thesis]. Osmania University; 2015. Available from: http://shodhganga.inflibnet.ac.in/handle/10603/42958

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Addis Ababa University

3. ASEFA, ABADI. STUDIES OF NOVEL GRAPHENE NANORIBBON/ POLYANILINE NANOCOMPOSITES FOR THEIR APPLICATIONS IN SOLAR CELLS .

Degree: 2013, Addis Ababa University

URL: http://etd.aau.edu.et/dspace/handle/123456789/755

► Organic polymer nanocomposites blended with graphene nanostructures have recently attracted lot of scientific interest due to their novel heterojunction charge transport properties and for fabrication… (more)

Subjects/Keywords: graphene; nanocomposites

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APA (6^th Edition):

ASEFA, A. (2013). STUDIES OF NOVEL GRAPHENE NANORIBBON/ POLYANILINE NANOCOMPOSITES FOR THEIR APPLICATIONS IN SOLAR CELLS . (Thesis). Addis Ababa University. Retrieved from http://etd.aau.edu.et/dspace/handle/123456789/755

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

ASEFA, ABADI. “STUDIES OF NOVEL GRAPHENE NANORIBBON/ POLYANILINE NANOCOMPOSITES FOR THEIR APPLICATIONS IN SOLAR CELLS .” 2013. Thesis, Addis Ababa University. Accessed February 22, 2020. http://etd.aau.edu.et/dspace/handle/123456789/755.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

ASEFA, ABADI. “STUDIES OF NOVEL GRAPHENE NANORIBBON/ POLYANILINE NANOCOMPOSITES FOR THEIR APPLICATIONS IN SOLAR CELLS .” 2013. Web. 22 Feb 2020.

Vancouver:

ASEFA A. STUDIES OF NOVEL GRAPHENE NANORIBBON/ POLYANILINE NANOCOMPOSITES FOR THEIR APPLICATIONS IN SOLAR CELLS . [Internet] [Thesis]. Addis Ababa University; 2013. [cited 2020 Feb 22]. Available from: http://etd.aau.edu.et/dspace/handle/123456789/755.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

ASEFA A. STUDIES OF NOVEL GRAPHENE NANORIBBON/ POLYANILINE NANOCOMPOSITES FOR THEIR APPLICATIONS IN SOLAR CELLS . [Thesis]. Addis Ababa University; 2013. Available from: http://etd.aau.edu.et/dspace/handle/123456789/755

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Oregon State University

4. Kelley, Jeremiah (Jeremiah Joseph). Nanocomposites incorporating cellulose nanocrystals with potential applications in lithium ion batteries.

Degree: MS, Material Science, 2011, Oregon State University

URL: http://hdl.handle.net/1957/21774

► Cellulose nanocrystals (CNCs) have received considerable attention over the last ten years because CNCs can be produced from renewable materials such as straw, wood, cotton,… (more)

Subjects/Keywords: nanocomposites; Nanocrystals

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APA (6^th Edition):

Kelley, J. (. J. (2011). Nanocomposites incorporating cellulose nanocrystals with potential applications in lithium ion batteries. (Masters Thesis). Oregon State University. Retrieved from http://hdl.handle.net/1957/21774

Chicago Manual of Style (16^th Edition):

Kelley, Jeremiah (Jeremiah Joseph). “Nanocomposites incorporating cellulose nanocrystals with potential applications in lithium ion batteries.” 2011. Masters Thesis, Oregon State University. Accessed February 22, 2020. http://hdl.handle.net/1957/21774.

MLA Handbook (7^th Edition):

Kelley, Jeremiah (Jeremiah Joseph). “Nanocomposites incorporating cellulose nanocrystals with potential applications in lithium ion batteries.” 2011. Web. 22 Feb 2020.

Vancouver:

Kelley J(J. Nanocomposites incorporating cellulose nanocrystals with potential applications in lithium ion batteries. [Internet] [Masters thesis]. Oregon State University; 2011. [cited 2020 Feb 22]. Available from: http://hdl.handle.net/1957/21774.

Council of Science Editors:

Kelley J(J. Nanocomposites incorporating cellulose nanocrystals with potential applications in lithium ion batteries. [Masters Thesis]. Oregon State University; 2011. Available from: http://hdl.handle.net/1957/21774

University of Southern California

5. Wang, Chia-Hao. Nanoclay-reinforced polyurethane.

Degree: PhD, Materials Science, 2009, University of Southern California

URL: http://digitallibrary.usc.edu/cdm/compoundobject/collection/p15799coll127/id/258147/rec/4310

► Polyurethane-layered silicate nanocomposites with different layered silicates, montmorillonite (MMT) and attapulgite (ATT), were investigated to gain fundamental understanding of the role of nanofillers, the chemistry… (more)

▼ Polyurethane-layered silicate nanocomposites with different layered silicates, montmorillonite (MMT) and attapulgite (ATT), were investigated to gain fundamental understanding of the role of nanofillers, the chemistry of the modifiers, and the physics of polymer nanocomposites.; Polyurethane-based nanocomposites with compositions that included soft segments with number average molecular weights of 1000, 2000, and 2900, and organic-modified MMT (including MMT-30B and MMT-I30E) were prepared by in situ polymerization. Transmission electron microscopy (TEM) and wide-angle X-ray diffraction (WAXD) results revealed that both MMT-30B and MMT-I30E were intercalated and partially exfoliated by the PU. Mechanical tests showed that the PU1000 series in soft-segment molecular weight yielded superior tensile properties compared to the PU2000 and PU2900 series. Also, for a given molecular weight of soft segment in PU, the MMT-30B nanocomposites exhibited greater increases in Young’s modulus, tensile strength and elongation at break than the MMT-I30E counterpart, and the crystallinity of PU was enhanced by the clays.; In pristine PU and composites containing ATT nano-rods, the effects of functionalization on dispersion and on thermal, physical, and mechanical properties were characterized by Fourier transform infrared spectroscopy (FTIR), thermogravimetric analysis (TGA), transmission electron microscopy (TEM), differential scanning calorimetry (DSC), and mechanical testing. Functionalization of ATT nano-rods proved beneficial in terms of dispersion, degree of crystallinity, thermal stability, and tensile strength. A higher grafting content of 4,4’-methlenebis(phenyl isocyanate)-modified attapulgite (ATT-MDI) led to more uniform dispersion and enhanced tensile properties of the nanocomposites. However, the grafting content had negligible effects on the thermal behavior of PU/ATT-MDI nanocomposites.; To extend the applications of attapulgite to specific polymer systems and to heterogeneous catalytic reactions, the physicochemical changes resulting from thermal and acid treatments were investigated. TGA analysis of the untreated attapulgite revealed that dehydration and dehydroxylation occurred during heating. The dehydration and dehydroxylation led to changes in attapulgite structure, as demonstrated by FTIR spectra of heat-treated samples. The FTIR spectra also revealed that acid treatment led to hydroxylation of the heat-treated attapulgite. WAXD patterns of heat-treated samples showed a loss of crystal structure of attapulgite. Atomic force microscopy (AFM) and transmission electron microscopy (TEM) images of acid-treated attapulgite nano-rods revealed a rough surface with perforations. Advisors/Committee Members: Nutt, Steven R. (Committee Chair), Shing, Katherine S. (Committee Member), Sammis, Charles G. (Committee Member).

Subjects/Keywords: nanocomposites; polyurethane

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APA (6^th Edition):

Wang, C. (2009). Nanoclay-reinforced polyurethane. (Doctoral Dissertation). University of Southern California. Retrieved from http://digitallibrary.usc.edu/cdm/compoundobject/collection/p15799coll127/id/258147/rec/4310

Chicago Manual of Style (16^th Edition):

Wang, Chia-Hao. “Nanoclay-reinforced polyurethane.” 2009. Doctoral Dissertation, University of Southern California. Accessed February 22, 2020. http://digitallibrary.usc.edu/cdm/compoundobject/collection/p15799coll127/id/258147/rec/4310.

MLA Handbook (7^th Edition):

Wang, Chia-Hao. “Nanoclay-reinforced polyurethane.” 2009. Web. 22 Feb 2020.

Vancouver:

Wang C. Nanoclay-reinforced polyurethane. [Internet] [Doctoral dissertation]. University of Southern California; 2009. [cited 2020 Feb 22]. Available from: http://digitallibrary.usc.edu/cdm/compoundobject/collection/p15799coll127/id/258147/rec/4310.

Council of Science Editors:

Wang C. Nanoclay-reinforced polyurethane. [Doctoral Dissertation]. University of Southern California; 2009. Available from: http://digitallibrary.usc.edu/cdm/compoundobject/collection/p15799coll127/id/258147/rec/4310

6. Pereira Nabais, Catarina. Contribution à l’étude de l’insertion électrochimique du lithium dans des nanocomposites graphite / Pb et graphite / Sn / Sb : Contribution to the study of lithium electrochemical insertion in graphite / Pb and graphite / Sn / Sb nanocomposites.

Degree: Docteur es, Physique et Chimie de la Matière et des Matériaux, 2008, Université Henri Poincaré – Nancy I

URL: http://www.theses.fr/2008NAN10029

►

Cette étude s’inscrit dans le cadre de la recherche de nouvelles électrodes négatives de batteries à ions lithium ayant des capacités supérieures à celles du… (more)

▼

Cette étude s’inscrit dans le cadre de la recherche de nouvelles électrodes négatives de batteries à ions lithium ayant des capacités supérieures à celles du graphite. La synthèse de nouveaux matériaux d’électrode, constitués de nanoparticules métalliques de plomb ou d’alliage étain/antimoine déposées sur le graphite, consiste à réduire des halogénures métalliques, en présence de graphite, à l’aide d’un hydrure alcalin (NaH ou LiH) activé par un alcoolate généré in situ. Les caractéristiques structurales et morphologiques des différents systèmes graphite – métal sont ici étudiées par DRX, MET et MEB afin de mieux comprendre les mécanismes susceptibles d’intervenir lors de l’insertion de lithium. Le système graphite - plomb est étudié dans le but d’appréhender l’importance des interactions graphite - métal sur les performances électrochimiques. En effet, le caractère métallique du plomb paraît conduire à un faible ancrage des nanoparticules au support carboné et à des performances médiocres de ces matériaux comme électrodes négatives de batteries Li-ion. L’investigation systématique des composites graphite/(1-x)Sn/(x)Sb en fonction de la teneur en antimoine montre que le caractère semi-métallique de l’antimoine conduit à une amélioration des propriétés mécaniques et d’ancrage des nanoparticules de l’alliage SnSb au graphite. L’étude structurale et morphologique en fonction de la nature de l’hydrure montre que LiH comparé à NaH conduit à des composites plus homogènes, dont les particules, mieux accrochées à la surface du graphite, présentent une meilleure tenue en cyclage et des capacités massiques plus élevées.

The main propose of this work is to investigate new anode materials possessing high mass capacity and being able of replacing graphite in Li-ion batteries. Electrode materials constituted of Pb and Sn/Sb alloy nanoparticles dispersed on the graphite surface, were obtained by chemical reduction of a metal halide, in the presence of graphite, using an alkoxide - activated hydride (NaH or LiH) as a reducing agent. To collect information about the structural and the morphological characteristics of graphite-metal powders, XRD, TEM and SEM analyses were performed. These results allowed to establish a relation between the powder sample characteristics and the encountered electrochemical performances (mass capacity and cycling stability) during lithium insertion / de-insertion process. Graphite – Pb system was used as model for studying the influence of metal-graphite interactions on the electrochemical behaviour of graphite-metal compounds. The results point out to a weak interaction between Pb metal particles and the graphite surface, which seems to be the main reason for the poor electrochemical performances observed during cycling. The systematic study of graphite/(1-x)Sn/(x)Sb composites as function of Sb content appears to show that antimony semi-metallic character is responsible for SnSb pinning on the graphite surface and improvement of their electrochemical properties. Structural and morphological studies…

Advisors/Committee Members: Billaud, Denis (thesis director).

Subjects/Keywords: Nanocomposites

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APA (6^th Edition):

Pereira Nabais, C. (2008). Contribution à l’étude de l’insertion électrochimique du lithium dans des nanocomposites graphite / Pb et graphite / Sn / Sb : Contribution to the study of lithium electrochemical insertion in graphite / Pb and graphite / Sn / Sb nanocomposites. (Doctoral Dissertation). Université Henri Poincaré – Nancy I. Retrieved from http://www.theses.fr/2008NAN10029

Chicago Manual of Style (16^th Edition):

Pereira Nabais, Catarina. “Contribution à l’étude de l’insertion électrochimique du lithium dans des nanocomposites graphite / Pb et graphite / Sn / Sb : Contribution to the study of lithium electrochemical insertion in graphite / Pb and graphite / Sn / Sb nanocomposites.” 2008. Doctoral Dissertation, Université Henri Poincaré – Nancy I. Accessed February 22, 2020. http://www.theses.fr/2008NAN10029.

MLA Handbook (7^th Edition):

Pereira Nabais, Catarina. “Contribution à l’étude de l’insertion électrochimique du lithium dans des nanocomposites graphite / Pb et graphite / Sn / Sb : Contribution to the study of lithium electrochemical insertion in graphite / Pb and graphite / Sn / Sb nanocomposites.” 2008. Web. 22 Feb 2020.

Vancouver:

Pereira Nabais C. Contribution à l’étude de l’insertion électrochimique du lithium dans des nanocomposites graphite / Pb et graphite / Sn / Sb : Contribution to the study of lithium electrochemical insertion in graphite / Pb and graphite / Sn / Sb nanocomposites. [Internet] [Doctoral dissertation]. Université Henri Poincaré – Nancy I; 2008. [cited 2020 Feb 22]. Available from: http://www.theses.fr/2008NAN10029.

Council of Science Editors:

Pereira Nabais C. Contribution à l’étude de l’insertion électrochimique du lithium dans des nanocomposites graphite / Pb et graphite / Sn / Sb : Contribution to the study of lithium electrochemical insertion in graphite / Pb and graphite / Sn / Sb nanocomposites. [Doctoral Dissertation]. Université Henri Poincaré – Nancy I; 2008. Available from: http://www.theses.fr/2008NAN10029

University of Manchester

7. Albozahid, Muayad Abdulhasan Mali. Design of Novel High Modulus TPUs for NanoComposite Applications.

Degree: 2018, University of Manchester

URL: http://www.manchester.ac.uk/escholar/uk-ac-man-scw:313952

► Abstract This thesis focuses on designing thermoplastic nanocomposites with good mechanical, thermal and electrical properties. Thermoplastic nanocomposites, which are used in this work, are composed… (more)

▼ Abstract This thesis focuses on designing thermoplastic nanocomposites with good mechanical, thermal and electrical properties. Thermoplastic nanocomposites, which are used in this work, are composed of thermoplastic polyurethane (TPU) matrices and graphene nanofillers (GNFs). TPUs were synthesised with large ratios of hard segments (HS), including 60, 70 and 80 Wt. % HS. The influences of HS content and annealing treatment at 80 °C on the thermal, electrical and mechanical properties of TPUs and TPUs/GNFs samples have been investigated. The crystallinity, Tg, tensile strength, yield strength, and tensile modulus of all pure TPU samples are seen to increase after annealing treatment due to microphase separation. This also depends on the HS content in order to achieve better properties with various annealing times. The nanofillers include graphene nanoplatelets (GNP), graphene oxide (GO), and reduced graphene oxide (rGO). Various dispersion routes have been utilised to achieve better dispersion and distribution of the nanofillers. In-situ polymerisation, melt-compounding and solution-mixing techniques have been used to study dispersion effects and further moulding by injection moulding to prepare new TPU nanocomposites. Filler-matrix and filler-filler interfaces significantly influence the final performance of TPU nanocomposites. There is therefore a balance to be struck in the design of graphene-based TPU nanocomposites between the ability to achieve higher loadings of reinforcement and the reduction in effective Youngâ€™s modulus of the reinforcement as the number of layers in the nanofillers is increased. Effective stress transfer is achieved as a result of both dispersion and interfacial interaction. It has been demonstrated that graphene plays a reinforcing role in nanocomposites through its effective modulus as well as bonding with TPU phases. The first nanofiller studied is GNP, which shows good mechanical, thermal and electrical properties. The in-situ polymerisation approach was found to be the best dispersion method compared to melt compounding and solution mixing, as the optimum properties of GNP nanofillers can be achieved in the TPU/70 HS matrix. The TPU/70 HS had higher values compared to both TPU/60 HS and TPU/80 HS. However, the preparation of GO and rGO incorporating TPU/70 HS was not successfully synthesised due to the suppression of chain growth during polymerisation. Thus, the melt-compounding process was used instead for both GO- and rGO-based TPU matrices. TPU/70/GO nanocomposites displayed better mechanical performance compared to TPU/70/rGO nanocomposites, as a result of greater interaction between TPUs chains and fillers surfaces. It was found that the percolation thresholds for GO- and rGO-filled nanocomposites were significantly lower than that of GNP-filled nanocomposites due to their higher aspect ratio. Annealing treatment showed lower mechanical properties of TPU nanocomposite samples compared to non-annealed TPU nanocomposite samples, resulting from disruption of phase separation and… Advisors/Committee Members: WILKINSON, ARTHUR A, Saiani, Alberto, Wilkinson, Arthur.

Subjects/Keywords: TPUs nanocomposites

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APA (6^th Edition):

Albozahid, M. A. M. (2018). Design of Novel High Modulus TPUs for NanoComposite Applications. (Doctoral Dissertation). University of Manchester. Retrieved from http://www.manchester.ac.uk/escholar/uk-ac-man-scw:313952

Chicago Manual of Style (16^th Edition):

Albozahid, Muayad Abdulhasan Mali. “Design of Novel High Modulus TPUs for NanoComposite Applications.” 2018. Doctoral Dissertation, University of Manchester. Accessed February 22, 2020. http://www.manchester.ac.uk/escholar/uk-ac-man-scw:313952.

MLA Handbook (7^th Edition):

Albozahid, Muayad Abdulhasan Mali. “Design of Novel High Modulus TPUs for NanoComposite Applications.” 2018. Web. 22 Feb 2020.

Vancouver:

Albozahid MAM. Design of Novel High Modulus TPUs for NanoComposite Applications. [Internet] [Doctoral dissertation]. University of Manchester; 2018. [cited 2020 Feb 22]. Available from: http://www.manchester.ac.uk/escholar/uk-ac-man-scw:313952.

Council of Science Editors:

Albozahid MAM. Design of Novel High Modulus TPUs for NanoComposite Applications. [Doctoral Dissertation]. University of Manchester; 2018. Available from: http://www.manchester.ac.uk/escholar/uk-ac-man-scw:313952

Mississippi State University

8. Cho, Hosouk. CHEMICAL INCORPORATION OF POLYHEDRAL OLIGOMERIC SILSESQUIOXANE INTO THERMOSET MATRICES.

Degree: PhD, Chemistry, 2006, Mississippi State University

URL: http://sun.library.msstate.edu/ETD-db/theses/available/etd-07062006-183428/ ;

► A new class of organic-inorganic hybrid nanocomposites containing well-defined polyhedral oligomeric silsesquioxane (POSS) monomers, which have been copolymerized with organic monomers, were synthesized. Poly(isobutyl methacrylate-co-butanediol… (more)

▼ A new class of organic-inorganic hybrid nanocomposites containing well-defined polyhedral oligomeric silsesquioxane (POSS) monomers, which have been copolymerized with organic monomers, were synthesized. Poly(isobutyl methacrylate-co-butanediol dimethacrylate-co-3-methacrylylpropyl- heptaisobutyl(T8)polyhedral oligomeric silsesquioxane) (P(iBMA-co-BDMA-co-MA-POSS)) nanocomposites with different crosslink densities (BDMA loadings of 1, 3 and 5 wt%) and different MA-POSS percentages (5, 10, 15, 20 and 30 wt%) have been synthesized by radical-initiated terpolymerization. Linear P(iBMA-co-MA-POSS) copolymers were also prepared. Viscoelastic properties and morphologies were studied by DMTA (dynamic mechanical thermal analysis) and TEM (transmission electron microscopy). Two types of inorganic-organic hybrid polyhedral oligomeric silsesquioxane (POSS) / vinyl ester (VE) nanocomposites were synthesized. The first type contained a mixture of T8, T10 and T12 cages, each multifunctionalized with 3-methacrylylpropyl groups. The second type contained octa(3-methacrylylpropyldimethylsiloxyl)(T8)POSS. VE/POSS samples with weight ratios of 99/1, 97/3, 95/5, 90/10, 85/15 and 80/20 were prepared of each type. The nanocomposites were characterized by DMTA, TEM, scanning electron microscopy (SEM), X-ray energy dispersive spectroscopy (X-EDS), swelling, extraction and FT-IR. Three classes of inorganic-organic hybrid phenolic resin/polyhedral oligomeric silsesquioxane (POSS) nanocomposites were also synthesized via condensation polymerization. The POSS macromers employed included multifunctional dichloromethylsilylethylheptaisobutyl(T8)POSS, trisilanolheptaphenyl-POSS, and poly(phenylsilsesquioxane) uncured POSS. A nonfunctional octaisobutyl(T8)POSS was blended into the uncured phenolic resin followed by curing under the same conditions as those used for the other three nanocomposites classes. Phenolic/POSS samples with weight ratios of 99/1, 97/3, 95/5 and 90/10 were prepared of each type. Octaaminophenyl(T8)POSS and dodecaaminophenyl(T12)POSS were synthesized, characterized and then incorporated into two types of thermoset resins: (1) the bisphenol-F-based cyanate ester resin, PT-15, and (2) epoxy (Epon 828, Shell Chemical Corp.)/ 4,4?-diaminodiphenylmethane (DDM) resin, respectively, to make two series of nanocomposites. The sum of amino groups in both DDM and POSS were held in a 1:1 mole ratio to the epoxy groups. EPON-828/POSS/DDM (78.63/0/21.37, 77.48/5/17.52, 76.34/10/13.66, 74.05/20/5.95 and 72.28/27.72/0 wt/wt/wt compositions for both series) was prepared. PT-15/POSS composites (99/1, 97/3 and 95/5 wt/wt compositions for both types) were also prepared. Advisors/Committee Members: Charles U. Pittman (chair).

Subjects/Keywords: nanocomposites

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APA (6^th Edition):

Cho, H. (2006). CHEMICAL INCORPORATION OF POLYHEDRAL OLIGOMERIC SILSESQUIOXANE INTO THERMOSET MATRICES. (Doctoral Dissertation). Mississippi State University. Retrieved from http://sun.library.msstate.edu/ETD-db/theses/available/etd-07062006-183428/ ;

Chicago Manual of Style (16^th Edition):

Cho, Hosouk. “CHEMICAL INCORPORATION OF POLYHEDRAL OLIGOMERIC SILSESQUIOXANE INTO THERMOSET MATRICES.” 2006. Doctoral Dissertation, Mississippi State University. Accessed February 22, 2020. http://sun.library.msstate.edu/ETD-db/theses/available/etd-07062006-183428/ ;.

MLA Handbook (7^th Edition):

Cho, Hosouk. “CHEMICAL INCORPORATION OF POLYHEDRAL OLIGOMERIC SILSESQUIOXANE INTO THERMOSET MATRICES.” 2006. Web. 22 Feb 2020.

Vancouver:

Cho H. CHEMICAL INCORPORATION OF POLYHEDRAL OLIGOMERIC SILSESQUIOXANE INTO THERMOSET MATRICES. [Internet] [Doctoral dissertation]. Mississippi State University; 2006. [cited 2020 Feb 22]. Available from: http://sun.library.msstate.edu/ETD-db/theses/available/etd-07062006-183428/ ;.

Council of Science Editors:

Cho H. CHEMICAL INCORPORATION OF POLYHEDRAL OLIGOMERIC SILSESQUIOXANE INTO THERMOSET MATRICES. [Doctoral Dissertation]. Mississippi State University; 2006. Available from: http://sun.library.msstate.edu/ETD-db/theses/available/etd-07062006-183428/ ;

Oregon State University

9. Shir Mohammadi, Meisam. Developing Design Model for Cellulose Nanocomposites.

Degree: PhD, Materials Science, 2016, Oregon State University

URL: http://hdl.handle.net/1957/59427

► Today nano scale materials are being used for wide range of applications. One promising topic in nano scale materials is using them for reinforcement of… (more)

Subjects/Keywords: Nanocomposites; Nanocomposites (Materials) – Mechanical properties – Mathematical models

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APA (6^th Edition):

Shir Mohammadi, M. (2016). Developing Design Model for Cellulose Nanocomposites. (Doctoral Dissertation). Oregon State University. Retrieved from http://hdl.handle.net/1957/59427

Chicago Manual of Style (16^th Edition):

Shir Mohammadi, Meisam. “Developing Design Model for Cellulose Nanocomposites.” 2016. Doctoral Dissertation, Oregon State University. Accessed February 22, 2020. http://hdl.handle.net/1957/59427.

MLA Handbook (7^th Edition):

Shir Mohammadi, Meisam. “Developing Design Model for Cellulose Nanocomposites.” 2016. Web. 22 Feb 2020.

Vancouver:

Shir Mohammadi M. Developing Design Model for Cellulose Nanocomposites. [Internet] [Doctoral dissertation]. Oregon State University; 2016. [cited 2020 Feb 22]. Available from: http://hdl.handle.net/1957/59427.

Council of Science Editors:

Shir Mohammadi M. Developing Design Model for Cellulose Nanocomposites. [Doctoral Dissertation]. Oregon State University; 2016. Available from: http://hdl.handle.net/1957/59427

10. Vanmarcke, Audrey. Etude des relations élaboration, morphologie et comportement mécanique de mélanges et (nano)composites à base d’amidon : Relationships between processing, morphology and mechanical behaviour of starch based blends and (nano)composites.

Degree: Docteur es, Physique et science des matériaux, 2017, Université Lille I – Sciences et Technologies

URL: http://www.theses.fr/2017LIL10153

►

L’amidon, de par son faible coût et son abondance, est un candidat de choix dans le développement de nouveaux biopolymères. Cependant, les propriétés mécaniques de… (more)

▼

L’amidon, de par son faible coût et son abondance, est un candidat de choix dans le développement de nouveaux biopolymères. Cependant, les propriétés mécaniques de l’amidon thermoplastique (TPS) étant inférieures à celles des polymères pétro-sourcés, il est très souvent mélangé à une polyoléfine (PO) résultant en un mélange incompatible dont la morphologie doit être optimisée. L’objectif de cette étude est d’améliorer la compatibilité de mélanges PO/TPS en modulant les propriétés de l’interface via l’utilisation de polyoléfines de polarité différente d’une part, et d’autre part, par l’ajout de nanocharges à l’interface du mélange. Le suivi de l’évolution de la structure des mélanges par SAXS lors d’essais de traction in situ a montré que les premiers signes de décohésion apparaissent pour des taux de déformation plus élevés lorsque le TPS est mélangé avec une PO plus polaire, indiquant l’existence d’une meilleure interface. Des nanocharges de carbonate de calcium (CaCO3) de polarité différente ont ensuite été ajoutées aux mélanges. Selon leur polarité, les CaCO3 peuvent être localisées à l’interface ou dans la phase dispersée amylacée donnant lieu à une réduction ou à une augmentation de sa taille selon la nature de la PO. L’étude du comportement mécanique a montré une augmentation des contraintes avec la PO la plus polaire indépendamment de la localisation des CaCO3 dans le mélange. Ceci met en évidence le fait qu’une compatibilisation par ajout de nanocharges ne nécessite pas uniquement de contrôler la dispersion pour les placer à l’interface du mélange, il faut également prendre en compte les propriétés intrinsèques de chaque composant.

Among the various bio-based polymers considered as potential alternative of oil-based plastics, starch appears as one of the most interesting materials due to its wide availability and low cost. However, thermoplastic starch (TPS) exhibits poor mechanical properties as compared to synthetic polymers. One strategy used to overcome this drawback consists in blending TPS with a polyolefin (PO) resulting in an incompatible blend which morphology has to be optimized. In that frame, the main objective of this work is to enhance the mechanical performances of PO/TPS blends via a modulation of the interface properties by using polyolefins with different polarity and by adding nanoparticles to compatibilize the blends. The structural evolution of the blends induced by strain has been followed in situ by SAXS and revealed that the first signs of decohesion appear at higher strain rates when the TPS is mixed with the more polar polyolefin indicating a better adhesion in this blend. Calcium carbonate nanoparticles (CaCO3) with different polarities were then added to the blends. According to their polarity, the CaCO3 were located at the interface or in the dispersed phase composed of TPS, resulting in a refinement or a coarsening of the morphology depending on the polyolefin used. The study of the mechanical behavior shows an increase in the tensile properties for the more polar PO. These…

Advisors/Committee Members: Gaucher, Valérie (thesis director), Duquesne, Sophie (thesis director), Stoclet, Grégory (thesis director).

Subjects/Keywords: Nanocomposites; Compatibilisation; 668.42

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APA (6^th Edition):

Vanmarcke, A. (2017). Etude des relations élaboration, morphologie et comportement mécanique de mélanges et (nano)composites à base d’amidon : Relationships between processing, morphology and mechanical behaviour of starch based blends and (nano)composites. (Doctoral Dissertation). Université Lille I – Sciences et Technologies. Retrieved from http://www.theses.fr/2017LIL10153

Chicago Manual of Style (16^th Edition):

Vanmarcke, Audrey. “Etude des relations élaboration, morphologie et comportement mécanique de mélanges et (nano)composites à base d’amidon : Relationships between processing, morphology and mechanical behaviour of starch based blends and (nano)composites.” 2017. Doctoral Dissertation, Université Lille I – Sciences et Technologies. Accessed February 22, 2020. http://www.theses.fr/2017LIL10153.

MLA Handbook (7^th Edition):

Vanmarcke, Audrey. “Etude des relations élaboration, morphologie et comportement mécanique de mélanges et (nano)composites à base d’amidon : Relationships between processing, morphology and mechanical behaviour of starch based blends and (nano)composites.” 2017. Web. 22 Feb 2020.

Vancouver:

Vanmarcke A. Etude des relations élaboration, morphologie et comportement mécanique de mélanges et (nano)composites à base d’amidon : Relationships between processing, morphology and mechanical behaviour of starch based blends and (nano)composites. [Internet] [Doctoral dissertation]. Université Lille I – Sciences et Technologies; 2017. [cited 2020 Feb 22]. Available from: http://www.theses.fr/2017LIL10153.

Council of Science Editors:

Vanmarcke A. Etude des relations élaboration, morphologie et comportement mécanique de mélanges et (nano)composites à base d’amidon : Relationships between processing, morphology and mechanical behaviour of starch based blends and (nano)composites. [Doctoral Dissertation]. Université Lille I – Sciences et Technologies; 2017. Available from: http://www.theses.fr/2017LIL10153

University of Alberta

11. Nelson-Fitzpatrick, Nathaniel. Novel materials for the design of cantilever transducers.

Degree: PhD, Department of Electrical and Computer Engineering, 2011, University of Alberta

URL: https://era.library.ualberta.ca/files/9k41zf62j

► Micro and nanocantilever structures have been used as transducers for a plethora of sensor applications. These transducer technologies have similar shapes, but the material properties… (more)

▼ Micro and nanocantilever structures have been used as transducers for a plethora of sensor applications. These transducer technologies have similar shapes, but the material properties and geometrical optimizations needed to improve sensitivity are rather different. This is a record of two different material and design strategies undertaken for static and resonant cantilever sensors. For resonant cantilever sensors we desire a material that is stiff and light. We fabricated silicon nanocantilevers using electron beam lithography and a cryogenic etching technique and assayed their resonance frequencies. The brittle nature of surface machined Si necessitated the move towards nanocantilevers made from glassy materials like Si3N4 and SiCN, which are difficult to deposit reliably in thicknesses below 50 nm. Alternatively, we fabricated and characterized atomic layer deposited (ALD) TiN films for nanocantilevers. We assayed chemical and physical characteristics of TiN films deposited between 120˚C and 300˚C with XPS, XRD, ellipsometry, and wafer bowing. We then fabricated nanoresonator beams out of TiN deposited at 200˚C. For static cantilever sensors we designed an Au-Ta nanocomposite alloy. Combining Au and Ta using magnetron co-sputtering we synthesized a material with low intrinsic stress while retaining the chemical affinity of Au to thiolized molecules. XRD, SEM, AFM, nanoindentation, stress measurements and nanocantilever resonance tests were performed to determine the bulk and surface characteristics of these Au-Ta alloys. The FCC <111> structure of Au was retained in films below 50 at.% Ta. Young's modulus was increased slightly by the addition of Ta while hardness was increased fivefold. The film's deposited stress was relieved upon inclusion of 5 at.% Ta. Chemical characteristics of Au-Ta films over the range of Pure Au to Au 40 at.% Ta was assessed using contact angle measurements, XPS, FTIR and cantilever measurements. As Ta concentration was increased the binding of 1-dodecanethiol was hindered. Low Ta films (5 and 10 at.% Ta) exhibited reduced but significant thiol binding, while higher concentrations displayed insignificant binding. We fabricated geometrically optimized cantilevers with a theoretical spring constant as low as 10.5 mN/m. The detection of dodecanethiol was demonstrated with these cantilevers, confirming intrinsic sensitivity to thiolized molecules.

Subjects/Keywords: nanocomposites; microcantilever; transducers

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Nelson-Fitzpatrick, N. (2011). Novel materials for the design of cantilever transducers. (Doctoral Dissertation). University of Alberta. Retrieved from https://era.library.ualberta.ca/files/9k41zf62j

Chicago Manual of Style (16^th Edition):

Nelson-Fitzpatrick, Nathaniel. “Novel materials for the design of cantilever transducers.” 2011. Doctoral Dissertation, University of Alberta. Accessed February 22, 2020. https://era.library.ualberta.ca/files/9k41zf62j.

MLA Handbook (7^th Edition):

Nelson-Fitzpatrick, Nathaniel. “Novel materials for the design of cantilever transducers.” 2011. Web. 22 Feb 2020.

Vancouver:

Nelson-Fitzpatrick N. Novel materials for the design of cantilever transducers. [Internet] [Doctoral dissertation]. University of Alberta; 2011. [cited 2020 Feb 22]. Available from: https://era.library.ualberta.ca/files/9k41zf62j.

Council of Science Editors:

Nelson-Fitzpatrick N. Novel materials for the design of cantilever transducers. [Doctoral Dissertation]. University of Alberta; 2011. Available from: https://era.library.ualberta.ca/files/9k41zf62j

University of Manchester

12. Albozahid, Muayad. Design of novel high modulus TPUs for nanocomposite applications.

Degree: PhD, 2018, University of Manchester

URL: https://www.research.manchester.ac.uk/portal/en/theses/design-of-novel-high-modulus-tpus-for-nanocomposite-applications(ce7989db-b70d-46a3-8c11-6793a6d9e235).html ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.740372

► This thesis focuses on designing thermoplastic nanocomposites with good mechanical, thermal and electrical properties. Thermoplastic nanocomposites, which are used in this work, are composed of… (more)

▼ This thesis focuses on designing thermoplastic nanocomposites with good mechanical, thermal and electrical properties. Thermoplastic nanocomposites, which are used in this work, are composed of thermoplastic polyurethane (TPU) matrices and graphene nanofillers (GNFs). TPUs were synthesised with large ratios of hard segments (HS), including 60, 70 and 80 Wt. % HS. The influences of HS content and annealing treatment at 80 °C on the thermal, electrical and mechanical properties of TPUs and TPUs/GNFs samples have been investigated. The crystallinity, Tg, tensile strength, yield strength, and tensile modulus of all pure TPU samples are seen to increase after annealing treatment due to microphase separation. This also depends on the HS content in order to achieve better properties with various annealing times. The nanofillers include graphene nanoplatelets (GNP), graphene oxide (GO), and reduced graphene oxide (rGO). Various dispersion routes have been utilised to achieve better dispersion and distribution of the nanofillers. In-situ polymerisation, melt-compounding and solution-mixing techniques have been used to study dispersion effects and further moulding by injection moulding to prepare new TPU nanocomposites. Filler-matrix and filler-filler interfaces significantly influence the final performance of TPU nanocomposites. There is therefore a balance to be struck in the design of graphene-based TPU nanocomposites between the ability to achieve higher loadings of reinforcement and the reduction in effective Youngâs modulus of the reinforcement as the number of layers in the nanofillers is increased. Effective stress transfer is achieved as a result of both dispersion and interfacial interaction. It has been demonstrated that graphene plays a reinforcing role in nanocomposites through its effective modulus as well as bonding with TPU phases. The first nanofiller studied is GNP, which shows good mechanical, thermal and electrical properties. The in-situ polymerisation approach was found to be the best dispersion method compared to melt compounding and solution mixing, as the optimum properties of GNP nanofillers can be achieved in the TPU/70 HS matrix. The TPU/70 HS had higher values compared to both TPU/60 HS and TPU/80 HS. However, the preparation of GO and rGO incorporating TPU/70 HS was not successfully synthesised due to the suppression of chain growth during polymerisation. Thus, the melt-compounding process was used instead for both GO- and rGO-based TPU matrices. TPU/70/GO nanocomposites displayed better mechanical performance compared to TPU/70/rGO nanocomposites, as a result of greater interaction between TPUs chains and fillers surfaces. It was found that the percolation thresholds for GO- and rGO-filled nanocomposites were significantly lower than that of GNP-filled nanocomposites due to their higher aspect ratio. Annealing treatment showed lower mechanical properties of TPU nanocomposite samples compared to non-annealed TPU nanocomposite samples, resulting from disruption of phase separation and restacking…

Subjects/Keywords: 620; TPUs nanocomposites

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Albozahid, M. (2018). Design of novel high modulus TPUs for nanocomposite applications. (Doctoral Dissertation). University of Manchester. Retrieved from https://www.research.manchester.ac.uk/portal/en/theses/design-of-novel-high-modulus-tpus-for-nanocomposite-applications(ce7989db-b70d-46a3-8c11-6793a6d9e235).html ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.740372

Chicago Manual of Style (16^th Edition):

Albozahid, Muayad. “Design of novel high modulus TPUs for nanocomposite applications.” 2018. Doctoral Dissertation, University of Manchester. Accessed February 22, 2020. https://www.research.manchester.ac.uk/portal/en/theses/design-of-novel-high-modulus-tpus-for-nanocomposite-applications(ce7989db-b70d-46a3-8c11-6793a6d9e235).html ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.740372.

MLA Handbook (7^th Edition):

Albozahid, Muayad. “Design of novel high modulus TPUs for nanocomposite applications.” 2018. Web. 22 Feb 2020.

Vancouver:

Albozahid M. Design of novel high modulus TPUs for nanocomposite applications. [Internet] [Doctoral dissertation]. University of Manchester; 2018. [cited 2020 Feb 22]. Available from: https://www.research.manchester.ac.uk/portal/en/theses/design-of-novel-high-modulus-tpus-for-nanocomposite-applications(ce7989db-b70d-46a3-8c11-6793a6d9e235).html ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.740372.

Council of Science Editors:

Albozahid M. Design of novel high modulus TPUs for nanocomposite applications. [Doctoral Dissertation]. University of Manchester; 2018. Available from: https://www.research.manchester.ac.uk/portal/en/theses/design-of-novel-high-modulus-tpus-for-nanocomposite-applications(ce7989db-b70d-46a3-8c11-6793a6d9e235).html ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.740372

Kansas State University

13. Manepalli, Pavan Harshit. Use of thermoplastic starch in poly(lactic acid)/poly(butylene adipate-co-terephthalate) based nanocomposites for bio-based food packaging.

Degree: PhD, Department of Grain Science and Industry, 2019, Kansas State University

URL: http://hdl.handle.net/2097/39378

► Poly(lactic acid) (PLA) is the most common bio-based & compostable polymer available commercially that is cost competitive and combines a range of desirable properties like… (more)

▼ Poly(lactic acid) (PLA) is the most common bio-based & compostable polymer available commercially that is cost competitive and combines a range of desirable properties like melt processability, high strength and modulus. The films made from this aliphatic polyester tend to be brittle which can be overcome by blending PLA with another bio-based polymer with high flexibility poly(butylene adipate-co-terephthalate) (PBAT), but the resultant blend is only biodegradable in composting conditions. The primary focus of this study was incorporation of thermoplastic starch (TPS) in PLA/PBAT blends to increase the rate of biodegradability and decrease the cost. In the first part of this study, as a preliminary step only PLA/PBAT blends were investigated along with nanofiller nanocrystalline cellulose (NCC) as a nanofiller for enhancing mechanical and barrier properties. Melt extrusion was used for preparation of nanocomposites and 200 microns thick films were formed by melt pressing. PBAT enhanced elongation but NCC did not have any positive impact on the mechanical and barrier properties of the nanocomposites as NCC was aggregated in the polymer matrix due to the difference in polarity based on the hydrophilic nature of the nanofiller and hydrophobic nature of the polymer matrix. In the second part of study, up to 40%TPS was blended along with the PLA/PBAT/NCC nanocomposites. Joncryl (0.5%) was used as a compatibilizer. TPS addition decreased the mechanical and barrier properties (Tensile strength (TS) = 15- 30 MPa, Elongation at break (EB) = 6-12%, Water vapor permeability (WVP) = 1.6-8.3 g.mm/kPa.h.m²), although addition of NCC helped in increasing the TS and decreasing the WVP. Dispersion of NCC improved with the addition of hydrophilic TPS. Analytical techniques including transmission electron microscopy, fourier-transform infrared spectroscopy, differential scanning calorimetry were used to study the polymer-polymer and polymer-nanofiller interactions. Optimization study of PLA/PBAT/TPS/NCC nanocomposites was done using mixture response surface methods. Quadratic models with good predicted R² (between 84.3% and 97.59%) were developed for all the responses. Optimization study was done that could yield films with optimum properties comparable to commercial plastics and maximizing the level of TPS. Films with optimum properties (TS = 29.5 MPa, EB = 12%, WVP = 1.99 g.mm/kPa.h.m²) were predicted at levels of 64.3% PLA, 14.5% PBAT, 18% TPS and 2.6% NCC along with 0.5% Joncryl. The improved mechanical and barrier performance suggested that PLA/PBAT/TPS/NCC nanocomposites have potential use in food packaging applications. In the final phase of study, mathematical modeling was used to understand the influence of nanofiller (NCC) on the mechanical and barrier properties of the nanocomposites. The modified Halpin-Tsai equation was used to model the elastic modulus of the nanocomposites, while the modified Nielsen equation was used to model the WVP as a function of nanofiller content, geometry, strength and interactions with… Advisors/Committee Members: Sajid Alavi.

Subjects/Keywords: Food Packaging; Nanocomposites

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Manepalli, P. H. (2019). Use of thermoplastic starch in poly(lactic acid)/poly(butylene adipate-co-terephthalate) based nanocomposites for bio-based food packaging. (Doctoral Dissertation). Kansas State University. Retrieved from http://hdl.handle.net/2097/39378

Chicago Manual of Style (16^th Edition):

Manepalli, Pavan Harshit. “Use of thermoplastic starch in poly(lactic acid)/poly(butylene adipate-co-terephthalate) based nanocomposites for bio-based food packaging.” 2019. Doctoral Dissertation, Kansas State University. Accessed February 22, 2020. http://hdl.handle.net/2097/39378.

MLA Handbook (7^th Edition):

Manepalli, Pavan Harshit. “Use of thermoplastic starch in poly(lactic acid)/poly(butylene adipate-co-terephthalate) based nanocomposites for bio-based food packaging.” 2019. Web. 22 Feb 2020.

Vancouver:

Manepalli PH. Use of thermoplastic starch in poly(lactic acid)/poly(butylene adipate-co-terephthalate) based nanocomposites for bio-based food packaging. [Internet] [Doctoral dissertation]. Kansas State University; 2019. [cited 2020 Feb 22]. Available from: http://hdl.handle.net/2097/39378.

Council of Science Editors:

Manepalli PH. Use of thermoplastic starch in poly(lactic acid)/poly(butylene adipate-co-terephthalate) based nanocomposites for bio-based food packaging. [Doctoral Dissertation]. Kansas State University; 2019. Available from: http://hdl.handle.net/2097/39378

14. Ghebache, Zohra. Contribution à l'élaboration de Nano-composites à Base de Polymère Conducteur.

Degree: 2016, Université M'Hamed Bougara Boumerdès

URL: http://dlibrary.univ-boumerdes.dz:8080/handle/123456789/2895

138 p. :ill.; 30 cm

L'objectif du présent travail est la synthèse et caractérisation des nanocomposites polymères conducteurs (transducteurs partie sensible de biocapteurs) à base de poly(aniline) dopée par un acide solide (zéolithe HY) greffé avec différents

Subjects/Keywords: Nanocomposites; Nanoparticules; Polymères conducteurs

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Ghebache, Z. (2016). Contribution à l'élaboration de Nano-composites à Base de Polymère Conducteur. (Thesis). Université M'Hamed Bougara Boumerdès. Retrieved from http://dlibrary.univ-boumerdes.dz:8080/handle/123456789/2895

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Ghebache, Zohra. “Contribution à l'élaboration de Nano-composites à Base de Polymère Conducteur.” 2016. Thesis, Université M'Hamed Bougara Boumerdès. Accessed February 22, 2020. http://dlibrary.univ-boumerdes.dz:8080/handle/123456789/2895.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Ghebache, Zohra. “Contribution à l'élaboration de Nano-composites à Base de Polymère Conducteur.” 2016. Web. 22 Feb 2020.

Vancouver:

Ghebache Z. Contribution à l'élaboration de Nano-composites à Base de Polymère Conducteur. [Internet] [Thesis]. Université M'Hamed Bougara Boumerdès; 2016. [cited 2020 Feb 22]. Available from: http://dlibrary.univ-boumerdes.dz:8080/handle/123456789/2895.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Ghebache Z. Contribution à l'élaboration de Nano-composites à Base de Polymère Conducteur. [Thesis]. Université M'Hamed Bougara Boumerdès; 2016. Available from: http://dlibrary.univ-boumerdes.dz:8080/handle/123456789/2895

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

15. Coelho, Caio Parra Dantas. Obtenção e caracterização de nanocompósitos de poliestireno e argilas esmectíticas.

Degree: Mestrado, Engenharia Metalúrgica e de Materiais, 2008, University of São Paulo

URL: http://www.teses.usp.br/teses/disponiveis/3/3133/tde-05082009-165838/ ;

►

Neste trabalho foram preparados nanocompósitos de Poliestireno (PS) e argilas organofílicas. As argilas, inicialmente hidrofílicas, foram modificadas organicamente utilizando três sais quaternários de amônio diferentes:… (more)

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Neste trabalho foram preparados nanocompósitos de Poliestireno (PS) e argilas organofílicas. As argilas, inicialmente hidrofílicas, foram modificadas organicamente utilizando três sais quaternários de amônio diferentes: Cloreto de hexadecil trimetil amônio (CTAC), Cloreto de alquil dimetil benzil amônio (Dodigen) e Cloreto de dimetil dioctadecil amônio (Praepagen). A argila organofílica Cloisite 20A foi também utilizada neste estudo. Os nanocompósitos foram preparados por intercalação no polímero fundido por três técnicas diferentes: adição de argila em suspensão de álcool etílico por uma bomba dosadora de líquidos durante a extrusão, adição de argila em pó por um alimentador mecânico durante a extrusão e adição de suspensão de argila em álcool etílico durante obtenção por batelada. Os materiais obtidos foram caracterizados por difração de raios-X (DRX), microscopia óptica (MO) e microscopia eletrônica de transmissão (MET) e ensaios reológicos de Cisalhamento Oscilatório de Pequenas Amplitudes (COPA). As propriedades térmicas foram analisadas por análise termogravimétrica (TG) e as propriedades mecânicas foram analisadas por ensaios de tração e impacto Izod. As três técnicas se mostraram eficazes na preparação dos nanocompósitos, e seus resultados apresentaram uma similaridade muito grande. Os resultados de DRX e microscopia mostraram que a maioria dos nanocompósitos apresentou estruturas compostas de fases intercaladas e esfoliadas. As análises térmicas mostraram que a adição de argila ao PS o tornou mais estável termicamente, suportando maiores temperaturas antes de iniciar o processo de degradação. Os ensaios reológicos de COPA e ensaios mecânicos dos nanocompósitos obtidos não apresentaram grandes variações em relação ao PS puro.

In this work nanocomposites of polystyrene (PS) and organophilic clays were prepared. The clays were organically modified using three different ammonium quaternary salts: cetyltrimethyl ammonium chloride (commercial name: CTAC), alquildimethyl benzyl ammonium chloride (commercial name: Dodigen) and distearyl dimethyl ammonium chloride (commercial name: Praepagen). The organoclay Cloisite 20 A was also used in this work. The nanocomposites were prepared by melt intercalation using three different techniques: adding the organoclay as a diluted organic solvent supension to the extruder using a motor-driven metering pump, adding the organoclay as powder to the extruder using a mechanical feeder and adding the organoclay as a diluted organic solvent suspension to the mixer. The materials obtained were characterized by X-ray diffraction (XRD), optical microscopy (OM), transmission electron microscopy (TEM) and by rheological studies through small amplitude oscillatory shear tests (SAOS). The thermal properties were studied by thermogravimetrical analyses (TG) and the mechanical properties were studied by tensile and impact Izod strength tests. The three techniques were efficient to prepare nanocomposites, and their results were very similar. The DRX and microscopy results showed that the…

Advisors/Committee Members: Demarquette, Nicole Raymonde.

Subjects/Keywords: Argilas; Clay; Nanocomposites; Nanocompositos

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Coelho, C. P. D. (2008). Obtenção e caracterização de nanocompósitos de poliestireno e argilas esmectíticas. (Masters Thesis). University of São Paulo. Retrieved from http://www.teses.usp.br/teses/disponiveis/3/3133/tde-05082009-165838/ ;

Chicago Manual of Style (16^th Edition):

Coelho, Caio Parra Dantas. “Obtenção e caracterização de nanocompósitos de poliestireno e argilas esmectíticas.” 2008. Masters Thesis, University of São Paulo. Accessed February 22, 2020. http://www.teses.usp.br/teses/disponiveis/3/3133/tde-05082009-165838/ ;.

MLA Handbook (7^th Edition):

Coelho, Caio Parra Dantas. “Obtenção e caracterização de nanocompósitos de poliestireno e argilas esmectíticas.” 2008. Web. 22 Feb 2020.

Vancouver:

Coelho CPD. Obtenção e caracterização de nanocompósitos de poliestireno e argilas esmectíticas. [Internet] [Masters thesis]. University of São Paulo; 2008. [cited 2020 Feb 22]. Available from: http://www.teses.usp.br/teses/disponiveis/3/3133/tde-05082009-165838/ ;.

Council of Science Editors:

Coelho CPD. Obtenção e caracterização de nanocompósitos de poliestireno e argilas esmectíticas. [Masters Thesis]. University of São Paulo; 2008. Available from: http://www.teses.usp.br/teses/disponiveis/3/3133/tde-05082009-165838/ ;

16. Yang, Fengyuan. SUPERCRITICAL CARBON DIOXIDE (scCO2) PROCESSING OF DISPERSED POLYMER/CLAY NANOCOMPOSITES: STRUCTURAL AND BARRIER PROPERTIES.

Degree: 2014, Johns Hopkins University

URL: http://jhir.library.jhu.edu/handle/1774.2/37884

► Improved polymeric packaging materials have significantly economic and environmental impact on food, beverage and other industries. In this dissertation, we developed polymer/clay nanocomposites, by incorporating… (more)

▼ Improved polymeric packaging materials have significantly economic and environmental impact on food, beverage and other industries. In this dissertation, we developed polymer/clay nanocomposites, by incorporating impermeable layered silicates into polymeric matrix to enhance barrier properties. We utilized the unique properties of super critical carbon dioxide (scCO2) to exfoliate clay layers and improve polymer-clay interactions, which are two key challenges in the field of nanocomposites. Firstly, the scCO2 processing was applied to pre-disperse various commercial Cloisite® clays, the effects of scCO2 processing and chemical and physical properties of clay particles on clay pre-dispersion were investigated and the extent of clay pre-dispersion was assessed by SEM, WAXD and TGA. We found that the scCO2 processing results in pre-dispersion of organic modified clays regardless what kind of modifier on them. The degree of dispersion of different kind of clays actually is a competitive result between carbon dioxide philicity and modifiers interaction. In addition, TGA data confirm that the scCO2 processing does not remove surface modifiers from clays, which maintain good solubility of clay in organic solvent and compatibility with organic phase. Secondly, the pre-dispersed clay particles were solution blending with polystyrene (PS) to form nanocomposites, whose structural physical properties were characterized and evaluated by WAXD and TEM. The effects of scCO2 processing, clay dispersion, modification and fraction on improvements of physical properties such as rheology and barrier of nanocomposites were investigated. In addition, structure-barrier properties relationship was assessed based on several phenomenological models. In particular, we identified that 10A is the best reinforcement for improving PS barrier properties. Microstructural and barrier properties characterizations revealed that scCO2 processed clays prevent reorganization of platelets and lead to more homogenously clay dispersion with improved interfaces. As the increase of clay fraction and dispersion, gas permeation decreased continuously, in this study ~83% reduction of permeation had been achieved with 3.1 vol% of scCO2 processed clays with a calculated effective aspect ratio of 109. Finally, the concept of scCO2 processing reinforced polymer/clay nanocomposites based on PS matrix was translated to more complex melting extrusion of engineering polymers, such as polyethylene terephthalate (PET) and high density polyethylene (HDPE). The effects of scCO2 processing, clay dispersion, modification and fraction and temperature on improvements of structural and physical properties of matrix were investigated and discussed. 30B and 20A were identified as the best candidate for improving barrier properties of PET and HDPE respectively. Similarly, we found that scCO2 processed clays lead to more homogenously clay dispersion with improved interfaces. Nevertheless, unlike previous research, permeation of PET did not decrease continuously with increase of clay… Advisors/Committee Members: Rangaramanujam, Kannan (advisor).

Subjects/Keywords: Nanocomposites; Super critical carbon dioxide

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APA (6^th Edition):

Yang, F. (2014). SUPERCRITICAL CARBON DIOXIDE (scCO2) PROCESSING OF DISPERSED POLYMER/CLAY NANOCOMPOSITES: STRUCTURAL AND BARRIER PROPERTIES. (Thesis). Johns Hopkins University. Retrieved from http://jhir.library.jhu.edu/handle/1774.2/37884

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Yang, Fengyuan. “SUPERCRITICAL CARBON DIOXIDE (scCO2) PROCESSING OF DISPERSED POLYMER/CLAY NANOCOMPOSITES: STRUCTURAL AND BARRIER PROPERTIES.” 2014. Thesis, Johns Hopkins University. Accessed February 22, 2020. http://jhir.library.jhu.edu/handle/1774.2/37884.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Yang, Fengyuan. “SUPERCRITICAL CARBON DIOXIDE (scCO2) PROCESSING OF DISPERSED POLYMER/CLAY NANOCOMPOSITES: STRUCTURAL AND BARRIER PROPERTIES.” 2014. Web. 22 Feb 2020.

Vancouver:

Yang F. SUPERCRITICAL CARBON DIOXIDE (scCO2) PROCESSING OF DISPERSED POLYMER/CLAY NANOCOMPOSITES: STRUCTURAL AND BARRIER PROPERTIES. [Internet] [Thesis]. Johns Hopkins University; 2014. [cited 2020 Feb 22]. Available from: http://jhir.library.jhu.edu/handle/1774.2/37884.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Yang F. SUPERCRITICAL CARBON DIOXIDE (scCO2) PROCESSING OF DISPERSED POLYMER/CLAY NANOCOMPOSITES: STRUCTURAL AND BARRIER PROPERTIES. [Thesis]. Johns Hopkins University; 2014. Available from: http://jhir.library.jhu.edu/handle/1774.2/37884

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Anna University

17. Nixon Samuel Vijayakumar G. Synthesis of ZnO CuO BaO MnO ZnO BaO AND ZnO CaO composite nanofibers by electrospinning and their characterization;.

Degree: 2014, Anna University

URL: http://shodhganga.inflibnet.ac.in/handle/10603/14693

►

Electrospinning process is a versatile process which uses an electrostatic force to process many kinds of materials like polymers, composite, ceramic materials, etc. Electrospinning of… (more)

▼

Electrospinning process is a versatile process which uses an electrostatic force to process many kinds of materials like polymers, composite, ceramic materials, etc. Electrospinning of the composite sol derived from the sol-gel process yields one dimensional nanocomposite fibers. Poly (Vinyl Alcohol) / zinc acetate / copper acetate nanofibers were synthesized by electrospinning the sol obtained in the sol-gel process. The effect of applied voltage on the morphology of the fibers was studied. Nonlinear optical properties were studied by Kurtz-Perry powder technique and Second Harmonic Generation (SHG) efficiency was measured to be 11.1 times than that of KDP PVA / barium acetate / manganese acetate sol was electrospun to obtain composite nanofibers. These nanofibers were calcined at 1023 K for 5h and BaO / MnO composite nanofibers were obtained. Morphology of these nanofibers were studied by varying the size of the needle opening. Composite fibers of PVA / zinc acetate / barium acetate were obtained by electrospinning the sol obtained in the sol-gel process. The effect on morphology of these fibers was studied with respect to working distance. From the dielectric studies, it was found that the material exhibits ferroelectric to paraelectric phase transition at 323 K. From the SHG test, Second Harmonic Generation efficiency of this material was found to be 0.55 times than that of KDP. Second harmonic generation efficiency of ZnO/Ca0.5O and Zn0.5O/CaO nanocomposites were found to be 1.63 and 2.94 times than that of KDP. The A.C.conductivity of ZnO/Ca0.5O, Zn0.5O/CaO and ZnO/CaO nanocomposite materials were investigated. Among all the three composite materials, Zn0.5O/CaO has the highest conductivity, ZnO/CaO has moderate conductivity and ZnO/Ca0.5O has the least conductivity at 308 K. All these nanofibers exhibited interesting properties and could be used as potential candidates in various engineering applications. newline newline newline

Advisors/Committee Members: Suresh Kumar P.

Subjects/Keywords: Synthesis; nanofibers; electrospinning; paraelectric; nanocomposites

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APA (6^th Edition):

G, N. S. V. (2014). Synthesis of ZnO CuO BaO MnO ZnO BaO AND ZnO CaO composite nanofibers by electrospinning and their characterization;. (Thesis). Anna University. Retrieved from http://shodhganga.inflibnet.ac.in/handle/10603/14693

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

G, Nixon Samuel Vijayakumar. “Synthesis of ZnO CuO BaO MnO ZnO BaO AND ZnO CaO composite nanofibers by electrospinning and their characterization;.” 2014. Thesis, Anna University. Accessed February 22, 2020. http://shodhganga.inflibnet.ac.in/handle/10603/14693.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

G, Nixon Samuel Vijayakumar. “Synthesis of ZnO CuO BaO MnO ZnO BaO AND ZnO CaO composite nanofibers by electrospinning and their characterization;.” 2014. Web. 22 Feb 2020.

Vancouver:

G NSV. Synthesis of ZnO CuO BaO MnO ZnO BaO AND ZnO CaO composite nanofibers by electrospinning and their characterization;. [Internet] [Thesis]. Anna University; 2014. [cited 2020 Feb 22]. Available from: http://shodhganga.inflibnet.ac.in/handle/10603/14693.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

G NSV. Synthesis of ZnO CuO BaO MnO ZnO BaO AND ZnO CaO composite nanofibers by electrospinning and their characterization;. [Thesis]. Anna University; 2014. Available from: http://shodhganga.inflibnet.ac.in/handle/10603/14693

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Anna University

18. Revathi Purushothaman. Development and characterization of mesoporous terpolyimide nanocomposites with low dielectric constant.

Degree: Chemistry, 2013, Anna University

URL: http://shodhganga.inflibnet.ac.in/handle/10603/9988

►

Polyimides are a sophisticated family of materials, which cover an exhaustive range of high performance polymers. They find applications in highly technical end use fields… (more)

Subjects/Keywords: Dielectric constant; Mesoporous terpolyimide nanocomposites

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APA (6^th Edition):

Purushothaman, R. (2013). Development and characterization of mesoporous terpolyimide nanocomposites with low dielectric constant. (Thesis). Anna University. Retrieved from http://shodhganga.inflibnet.ac.in/handle/10603/9988

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Purushothaman, Revathi. “Development and characterization of mesoporous terpolyimide nanocomposites with low dielectric constant.” 2013. Thesis, Anna University. Accessed February 22, 2020. http://shodhganga.inflibnet.ac.in/handle/10603/9988.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Purushothaman, Revathi. “Development and characterization of mesoporous terpolyimide nanocomposites with low dielectric constant.” 2013. Web. 22 Feb 2020.

Vancouver:

Purushothaman R. Development and characterization of mesoporous terpolyimide nanocomposites with low dielectric constant. [Internet] [Thesis]. Anna University; 2013. [cited 2020 Feb 22]. Available from: http://shodhganga.inflibnet.ac.in/handle/10603/9988.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Purushothaman R. Development and characterization of mesoporous terpolyimide nanocomposites with low dielectric constant. [Thesis]. Anna University; 2013. Available from: http://shodhganga.inflibnet.ac.in/handle/10603/9988

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

University of Minnesota

19. Kim, Hyunwoo. Processing, morphology and properties of graphene reinforced polymer nanocomposites.

Degree: PhD, Chemical Engineering, 2009, University of Minnesota

URL: http://purl.umn.edu/56729

► A unique combination of excellent electrical, thermal and mechanical properties has made graphene a multi-functional reinforcement for polymers. The goal of this research has been… (more)

▼ A unique combination of excellent electrical, thermal and mechanical properties has made graphene a multi-functional reinforcement for polymers. The goal of this research has been three-fold: exfoliation of graphite for higher surface area, development of effective strategies for processing and characterization of graphene based polymer composites and understanding their processing, structure and property relationships. Exfoliated carbon sheets can be obtained from graphite oxide (GO). Functionalized graphene sheets (FGS) are formed by rapid pyrolysis of GO. Despite size reduction and distortion in the flat graphene structure by thermal treatments, FGS have high electrical conductivity and can be melt-processed into polymers. GO can be chemically modified with isocyanate, which improves dispersability in organic solvents and polymers. Although not as thermally stable and electrical conductive as FGS, isocyanate treated GO (iGO) has a larger diameter and is advantageous for retaining high toughness of the composites. FGS and iGO were incorporated into a range of model polymers. Solvent aided blending led to better dispersion of FGS in thermoplastic polyurethane than melt processing. Via solvent mixing, polyurethane became electrically conductive at even less than 0.5 wt% of FGS. With 3 wt% iGO, tensile modulus was increased up to 10 times and nitrogen permeation was reduced by 90%, implying high aspect ratio of exfoliated sheets. Morphology of melt compounded graphite and FGS in poly(ethylene-2,6-naphthalate) was characterized with electron microscopy, X-ray scattering, melt rheology and solid property measurements. Unlike graphite, dispersion of FGS quantified from different routes spreads over a wide range due to structural irregularity and simplified model assumptions. Melt viscoelasticity and electrical properties of polycarbonate were significantly modified by graphite orientation. Flow-induced orientation reduced property gains by graphene dispersion, while quiescent-state annealing restored rigidity and electrical conductivity of the composites. Using melt-state rheological and dielectric measurements, micro-structural evolution of FGS in polystyrene was monitored through annealing. Temporal property changes were analogous to the aging response of colloidal glasses and also influenced by matrix chain relaxation dynamics. Graphene-based polymer nanocomposites can be a new versatile soft material with numerous advantages. For maximized benefits, composite morphology must be tailored appropriately with understanding of its structure-property relationships.

Subjects/Keywords: Graphene; Polymer Nanocomposites; Chemical Engineering

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Kim, H. (2009). Processing, morphology and properties of graphene reinforced polymer nanocomposites. (Doctoral Dissertation). University of Minnesota. Retrieved from http://purl.umn.edu/56729

Chicago Manual of Style (16^th Edition):

Kim, Hyunwoo. “Processing, morphology and properties of graphene reinforced polymer nanocomposites.” 2009. Doctoral Dissertation, University of Minnesota. Accessed February 22, 2020. http://purl.umn.edu/56729.

MLA Handbook (7^th Edition):

Kim, Hyunwoo. “Processing, morphology and properties of graphene reinforced polymer nanocomposites.” 2009. Web. 22 Feb 2020.

Vancouver:

Kim H. Processing, morphology and properties of graphene reinforced polymer nanocomposites. [Internet] [Doctoral dissertation]. University of Minnesota; 2009. [cited 2020 Feb 22]. Available from: http://purl.umn.edu/56729.

Council of Science Editors:

Kim H. Processing, morphology and properties of graphene reinforced polymer nanocomposites. [Doctoral Dissertation]. University of Minnesota; 2009. Available from: http://purl.umn.edu/56729

University of Illinois – Urbana-Champaign

20. Banerjee, Debapriya. Statistical mechanical theory of equilibrium structure and miscibility of polymer nanocomposites: effects of polymer chemical heterogeneity and architecture, and nanoparticle surface corrugation and softness.

Degree: PhD, Materials Science & Engineering, 2015, University of Illinois – Urbana-Champaign

URL: http://hdl.handle.net/2142/89266

► Motivated by the persistent interest in different nanoparticles added to various polymer matrices, the Polymer Reference Interaction Site Model (PRISM) theory is extended and applied… (more)

▼ Motivated by the persistent interest in different nanoparticles added to various polymer matrices, the Polymer Reference Interaction Site Model (PRISM) theory is extended and applied to study the thermodynamics, statistical structure, and miscibility of diverse polymer nanocomposites (PNCs). Under chemistry-matched conditions and in the absence of interfacial attractions between a spherically smooth nanoparticle and the matrix fluid, the polymer-induced depletion attraction is dominant and induces entropic phase separation. The depletion attraction can be potentially reduced by modifying the nanoparticle surface topography as recently observed in experiments. Two types of surface-modified nanoparticles have been considered in this thesis – (1) spheres with ordered roughness on the surface and (2) soft polymeric nanoparticles with surface fluctuations and fuzziness. Monte Carlo integration and other computational techniques have been developed to compute the effective interactions between such particles. The morphologically diverse particles introduce additional length scales, making the physics non-monotonic, subtle, and rich. The common advantage with using either of the particles is reduced contact aggregation and enhanced miscibility. Optimal surface corrugation and/or particle softness allow monomer penetration resulting in favourable (entropic) mixing. However, high enough degree of corrugation/softness can also result in destabilization by excluding the polymer from its interior. Another route of developing new nanocomposites is by tuning the polymer-particle interfacial chemistry. Prior work has established three states of spatial organization, namely depletion, steric stabilization and bridging, depending upon the effective interfacial attraction strengths. Introducing polymer chemical heterogeneity via the use of AB copolymers offers additional control over the equilibrium structure. Specifically, two types of copolymers are considered – (1) random copolymers (RCP) of disordered sequence and (2) ordered, alternating multiblock copolymers (MBCP). Quantum chemical calculations are combined with the polymer liquid state theory to predict structure and miscibility. The chain connectivity, monomer sequence, copolymer composition and differential wettability results in unique frustration in the system leading to novel states of organization of the polymer around the nanoparticles. In the context of strongly attractive nanoscopic fullerenes, this results in improved miscibility relative to the corresponding homopolymers. For some of the systems studied, maximum dispersion is predicted at an intermediate copolymer composition due to packing correlations and differential wetting effects with favourable comparison to experiments. Advisors/Committee Members: Schweizer, Kenneth S (advisor), Schweizer, Kenneth S (Committee Chair), Braun, Paul V (committee member), Ferguson, Andrew L (committee member), Schroeder, Charles M (committee member).

Subjects/Keywords: Polymer Nanocomposites; Integral Equation Theory

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APA (6^th Edition):

Banerjee, D. (2015). Statistical mechanical theory of equilibrium structure and miscibility of polymer nanocomposites: effects of polymer chemical heterogeneity and architecture, and nanoparticle surface corrugation and softness. (Doctoral Dissertation). University of Illinois – Urbana-Champaign. Retrieved from http://hdl.handle.net/2142/89266

Chicago Manual of Style (16^th Edition):

Banerjee, Debapriya. “Statistical mechanical theory of equilibrium structure and miscibility of polymer nanocomposites: effects of polymer chemical heterogeneity and architecture, and nanoparticle surface corrugation and softness.” 2015. Doctoral Dissertation, University of Illinois – Urbana-Champaign. Accessed February 22, 2020. http://hdl.handle.net/2142/89266.

MLA Handbook (7^th Edition):

Banerjee, Debapriya. “Statistical mechanical theory of equilibrium structure and miscibility of polymer nanocomposites: effects of polymer chemical heterogeneity and architecture, and nanoparticle surface corrugation and softness.” 2015. Web. 22 Feb 2020.

Vancouver:

Banerjee D. Statistical mechanical theory of equilibrium structure and miscibility of polymer nanocomposites: effects of polymer chemical heterogeneity and architecture, and nanoparticle surface corrugation and softness. [Internet] [Doctoral dissertation]. University of Illinois – Urbana-Champaign; 2015. [cited 2020 Feb 22]. Available from: http://hdl.handle.net/2142/89266.

Council of Science Editors:

Banerjee D. Statistical mechanical theory of equilibrium structure and miscibility of polymer nanocomposites: effects of polymer chemical heterogeneity and architecture, and nanoparticle surface corrugation and softness. [Doctoral Dissertation]. University of Illinois – Urbana-Champaign; 2015. Available from: http://hdl.handle.net/2142/89266

University of Illinois – Urbana-Champaign

21. Ozkan, Tanil. Mechanical and interfacial properties of carbon nanofibers for polymer nanocomposites.

Degree: MS, Mechanical Engineering, 2009, University of Illinois – Urbana-Champaign

URL: http://hdl.handle.net/2142/47634

► The mechanical and failure response of vapor grown carbon nanofibers (VGCNFs) has been unexplored despite the large volume of carbon nanofiber composites fabricated today. Three… (more)

▼ The mechanical and failure response of vapor grown carbon nanofibers (VGCNFs) has been unexplored despite the large volume of carbon nanofiber composites fabricated today. Three grades of VGCNFs, namely as-fabricated, high temperature heat treated, and graphitized/surface oxidized, with average diameters of 150 nm were tested individually for their tensile strength by a MEMS mechanical testing platform. Their nominal tensile strengths followed Weibull distributions with characteristic strength values between 2.74- 3.34 GPa, which correlated well with the expected effects of heat treatment and oxidative post-processing. These values are the first measurements reported for VGCNFs and are more than 50% smaller than the generally accepted values for the tensile strength of this class of nanofibers. The as-fabricated nanofibers had the smallest Weibull modulus indicating a wide flaw population that was reduced significantly upon heat treatment. The nanofiber fracture surface was that of a stacked truncated cup structure with oblique graphene layers comprising the backbone of VGCNFs. Under uniaxial tension, cleavage of the outer turbostratic layer occurred first, followed by relative slip of the internal oblique graphene layers. The change in the mechanical strength (Weibull strength), and its scatter (Weibull moduli), with heat treatment correlated well with the fiber structure evidence in Transmission Electron Microscopy (TEM) images, which showed graphitization of the outer turbostratic layer and the formation of a new interface with the inner, originally graphitic, layer that was characterized by structural discontinuities that reduced the total load bearing capacity of the nanofibers. In this work, the strength of the carbon nanofiber-polymer matrix interfaces was also quantified for the frrst time by means of novel nanoscale fiber pull-out experiments. The interfacial shear strength averaged 55 MPa revealing that the adhesion and bonding of the heat-treated, non-functionalized carbon nanofibers is quite better than that of non-functionalized carbon fibers (15-28 MPa) and as good as that of functionalized carbon fibers ( 40-65 MPa), which underscores that extrapolations of macroscale interfacial measurements to the nanoscale are not appropriate. Advisors/Committee Members: Chasiotis, Ioannis (advisor), Polycarpou, Andreas A. (advisor).

Subjects/Keywords: carbon nanofibers (CNF); Polymer nanocomposites

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Ozkan, T. (2009). Mechanical and interfacial properties of carbon nanofibers for polymer nanocomposites. (Thesis). University of Illinois – Urbana-Champaign. Retrieved from http://hdl.handle.net/2142/47634

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Ozkan, Tanil. “Mechanical and interfacial properties of carbon nanofibers for polymer nanocomposites.” 2009. Thesis, University of Illinois – Urbana-Champaign. Accessed February 22, 2020. http://hdl.handle.net/2142/47634.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Ozkan, Tanil. “Mechanical and interfacial properties of carbon nanofibers for polymer nanocomposites.” 2009. Web. 22 Feb 2020.

Vancouver:

Ozkan T. Mechanical and interfacial properties of carbon nanofibers for polymer nanocomposites. [Internet] [Thesis]. University of Illinois – Urbana-Champaign; 2009. [cited 2020 Feb 22]. Available from: http://hdl.handle.net/2142/47634.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Ozkan T. Mechanical and interfacial properties of carbon nanofibers for polymer nanocomposites. [Thesis]. University of Illinois – Urbana-Champaign; 2009. Available from: http://hdl.handle.net/2142/47634

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

University of Illinois – Urbana-Champaign

22. Yamamoto, Umi. Microscopic theory for dynamics in entangled polymer nanocomposites.

Degree: PhD, 0240, 2014, University of Illinois – Urbana-Champaign

URL: http://hdl.handle.net/2142/49732

► New microscopic theories for describing dynamics in polymer nanocomposites are developed and applied. The problem is addressed from two distinct perspectives and using two different… (more)

▼ New microscopic theories for describing dynamics in polymer nanocomposites are developed and applied. The problem is addressed from two distinct perspectives and using two different theoretical approaches. The first half of this dissertation studies the long-time and intermediate-time dynamics of nanoparticles in entangled and unentangled polymer melts for dilute particle concentrations. Using a combination of mode-coupling, Brownian motion, and polymer physics ideas, the nanoparticle long-time diffusion coefficients is formulated in terms of multiple length-scales, packing microstructures, and spatially-resolved polymer density fluctuation dynamics. The key motional mechanism is described via the parallel relaxation of the force exerted on the particle controlled by collective polymer constraint-release and the particle self-motion. A sharp but smooth crossover from the hydrodynamic to the non-hydrodynamic regime is predicted based on the Stokes-Einstein violation ratio as a function of all the system variables. Quantitative predictions are made for the recovery of the Stokes-Einstein law, and the diffusivity in the crossover regime agrees surprisingly well with large-scale molecular dynamics simulations for all particle sizes and chain lengths studied. The approach is also extended to address intermediate-time anomalous transport of a single nanoparticle and two-particle relative diffusion. The second half of this dissertation focuses on developing a novel dynamical theory for a liquid of infinitely-thin rods in the presence of hard spherical obstacles, aiming at a technical and conceptual extension of the existing paradigm for entangled polymer dynamics. As a fundamental theoretical development, the two-component generalization of a first-principles dynamic meanfield approach is presented. The theory enforces inter-needle topological uncrossability and needlesphere impenetrability in a unified manner, leading to a generalized theory of entanglements that includes the sphere excluded volume effect. Coupled self-consistent equations for the generalized diffusion tensors are constructed, and the expressions for the transverse localization lengths and the long-time diffusion coefficients are derived. In the static sphere limit, we find the effective tube diameter is generally reduced as a function of a single confinement parameter that quantifies the number of particles penetrating into the pure-polymer tube. A preliminary extension to treat flexible chain melts has also been achieved, and shown to agree reasonably well with simulations. The anisotropic needle diffusion constants are rich functions of the length-scale ratios, needle concentration and particle volume fraction. We show that the steric blocking of the longitudinal motion causes a literal and simultaneous localization of the two diffusion channels, and entangled needles can diffuse via a modified reptation dynamics over a window of polymer concentration but the compression of the tube and the blocking of the reptation motion must be… Advisors/Committee Members: Schweizer, Kenneth S. (advisor), Goldenfeld, Nigel D. (Committee Chair), Schweizer, Kenneth S. (committee member), Aksimentiev, Aleksei (committee member), Granick, Steve (committee member).

Subjects/Keywords: Nanocomposites; Polymer Dynamics; Entanglement; Nanoparticles

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APA (6^th Edition):

Yamamoto, U. (2014). Microscopic theory for dynamics in entangled polymer nanocomposites. (Doctoral Dissertation). University of Illinois – Urbana-Champaign. Retrieved from http://hdl.handle.net/2142/49732

Chicago Manual of Style (16^th Edition):

Yamamoto, Umi. “Microscopic theory for dynamics in entangled polymer nanocomposites.” 2014. Doctoral Dissertation, University of Illinois – Urbana-Champaign. Accessed February 22, 2020. http://hdl.handle.net/2142/49732.

MLA Handbook (7^th Edition):

Yamamoto, Umi. “Microscopic theory for dynamics in entangled polymer nanocomposites.” 2014. Web. 22 Feb 2020.

Vancouver:

Yamamoto U. Microscopic theory for dynamics in entangled polymer nanocomposites. [Internet] [Doctoral dissertation]. University of Illinois – Urbana-Champaign; 2014. [cited 2020 Feb 22]. Available from: http://hdl.handle.net/2142/49732.

Council of Science Editors:

Yamamoto U. Microscopic theory for dynamics in entangled polymer nanocomposites. [Doctoral Dissertation]. University of Illinois – Urbana-Champaign; 2014. Available from: http://hdl.handle.net/2142/49732

Anna University

23. Karikalchozhan C. Studies on synthesis andCharacterization of polybenzoxazineBased nanocomposites;.

Degree: Studies on synthesis andCharacterization of polybenzoxazineBased nanocomposites, 2015, Anna University

URL: http://shodhganga.inflibnet.ac.in/handle/10603/43080

►

The objective of the present work is to focus on the synthesis and newlinecharacterization of different functionalized polybenzoxazines and to improve newlinethe properties of polybenzoxazines… (more)

Subjects/Keywords: nanocomposites; polybenzoxazine; Science and humanities

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APA (6^th Edition):

C, K. (2015). Studies on synthesis andCharacterization of polybenzoxazineBased nanocomposites;. (Thesis). Anna University. Retrieved from http://shodhganga.inflibnet.ac.in/handle/10603/43080

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

C, Karikalchozhan. “Studies on synthesis andCharacterization of polybenzoxazineBased nanocomposites;.” 2015. Thesis, Anna University. Accessed February 22, 2020. http://shodhganga.inflibnet.ac.in/handle/10603/43080.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

C, Karikalchozhan. “Studies on synthesis andCharacterization of polybenzoxazineBased nanocomposites;.” 2015. Web. 22 Feb 2020.

Vancouver:

C K. Studies on synthesis andCharacterization of polybenzoxazineBased nanocomposites;. [Internet] [Thesis]. Anna University; 2015. [cited 2020 Feb 22]. Available from: http://shodhganga.inflibnet.ac.in/handle/10603/43080.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

C K. Studies on synthesis andCharacterization of polybenzoxazineBased nanocomposites;. [Thesis]. Anna University; 2015. Available from: http://shodhganga.inflibnet.ac.in/handle/10603/43080

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Anna University

24. Rajasekaran R. Studies on development and Characterization of bismaleimide Modified polysulfone epoxy matrices And nanocomposites;.

Degree: Studies on development and Characterization of bismaleimide Modified polysulfone epoxy matrices And nanocomposites, 2015, Anna University

URL: http://shodhganga.inflibnet.ac.in/handle/10603/43171

►

The bismaleimide modified polysulfone epoxy matrices in the form newlineof castings were characterized by physico chemical mechanical tensile newlinestrength flexural strength tensile modulus flexural modulus… (more)

Subjects/Keywords: polysulfone epoxy matrices And nanocomposites

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APA (6^th Edition):

R, R. (2015). Studies on development and Characterization of bismaleimide Modified polysulfone epoxy matrices And nanocomposites;. (Thesis). Anna University. Retrieved from http://shodhganga.inflibnet.ac.in/handle/10603/43171

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

R, Rajasekaran. “Studies on development and Characterization of bismaleimide Modified polysulfone epoxy matrices And nanocomposites;.” 2015. Thesis, Anna University. Accessed February 22, 2020. http://shodhganga.inflibnet.ac.in/handle/10603/43171.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

R, Rajasekaran. “Studies on development and Characterization of bismaleimide Modified polysulfone epoxy matrices And nanocomposites;.” 2015. Web. 22 Feb 2020.

Vancouver:

R R. Studies on development and Characterization of bismaleimide Modified polysulfone epoxy matrices And nanocomposites;. [Internet] [Thesis]. Anna University; 2015. [cited 2020 Feb 22]. Available from: http://shodhganga.inflibnet.ac.in/handle/10603/43171.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

R R. Studies on development and Characterization of bismaleimide Modified polysulfone epoxy matrices And nanocomposites;. [Thesis]. Anna University; 2015. Available from: http://shodhganga.inflibnet.ac.in/handle/10603/43171

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Penn State University

25. Yang , Huilin. Antibacterial Titania Nanocomposites.

Degree: MS, Chemistry, 2010, Penn State University

URL: https://etda.libraries.psu.edu/catalog/10578

► Titania nanoparticles with antibacterial shells were synthesized by two methods: silane method and atom transfer radical polymerization (ATRP) method. Fourier-transform infrared (FT-IR), X-ray photoelectron spectroscopy… (more)

Subjects/Keywords: DMAEMA; antibacterial; nanocomposites; titania

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APA (6^th Edition):

Yang , H. (2010). Antibacterial Titania Nanocomposites. (Masters Thesis). Penn State University. Retrieved from https://etda.libraries.psu.edu/catalog/10578

Chicago Manual of Style (16^th Edition):

Yang , Huilin. “Antibacterial Titania Nanocomposites.” 2010. Masters Thesis, Penn State University. Accessed February 22, 2020. https://etda.libraries.psu.edu/catalog/10578.

MLA Handbook (7^th Edition):

Yang , Huilin. “Antibacterial Titania Nanocomposites.” 2010. Web. 22 Feb 2020.

Vancouver:

Yang H. Antibacterial Titania Nanocomposites. [Internet] [Masters thesis]. Penn State University; 2010. [cited 2020 Feb 22]. Available from: https://etda.libraries.psu.edu/catalog/10578.

Council of Science Editors:

Yang H. Antibacterial Titania Nanocomposites. [Masters Thesis]. Penn State University; 2010. Available from: https://etda.libraries.psu.edu/catalog/10578

University of Tennessee – Knoxville

26. Linton, Dias. The Importance of Chain Connectivity in the Formation of Non-covalent Interactions between Polymers and Single-walled Carbon Nanotubes and its Impact on Dispersion.

Degree: 2010, University of Tennessee – Knoxville

URL: https://trace.tennessee.edu/utk_graddiss/896

► Polymer nanocomposites have garnered incredible promise in the field of material science due to the excellent mechanical strength, thermal and electrical conductivities of the nanoparticles… (more)

▼ Polymer nanocomposites have garnered incredible promise in the field of material science due to the excellent mechanical strength, thermal and electrical conductivities of the nanoparticles and the extension of these properties to the processing flexibility inherent to plastics. However, practical realization of these nanoparticle-based materials has been hindered by the tendency of these nanoparticles to aggregate as a result of strong inter-particle forces. In this dissertation, we investigate the formation of non-covalent charge transfer interactions between polymers and single-walled carbon nanotubes (SWNTs) with the goal of optimizing interfacial adhesion and homogeneity of nanocomposites without modifying the SWNT native surface. Nanocomposites of SWNTs and three sets of polymer matrices with varying composition of electron donating or electron accepting functional groups were prepared. In the first part of this dissertation, quantitative characterization by optical microscopy and Raman spectroscopy and qualitative results through thick film composite visualization show that the existence of a moderate amount of interacting moieties along the polymer chain results in an enhanced intermolecular interaction with SWNT, which translates to an optimum nanoparticle homogeneity. Calculations from density functional theory and Flory-Huggins theory correlate with the experimental results, which illustrate that chain connectivity is critical in controlling the accessibility of the functional groups to form intermolecular interactions. Thus, controlling the amount of interacting functional groups throughout the polymer chain such that an adequate distance between them is realized will direct the extent of charge transfer interaction, which enables tuning the SWNT dispersion. The second part of this dissertation focuses on the elucidation of the morphology of these nanoparticle entities in a polymer matrix. The observance of microphase-separated peaks in the scattering patterns of polyacrylonitrile (PAN) nanocomposites indicate an ordering of the PAN polymer induced by the carbon nanotube cage, which could either be due to a thermodynamically bound layer around the SWNT or the occurrence of SWNT-induced PAN crystallization. Finally, UV-Vis measurements were performed on SWNT-polymer suspension in order to comprehend the interactions that occur during nanocomposite fabrication. These results demonstrate that SWNT dispersions in pure N,N-dimethyl formamide (DMF) are stabilized by the adsorption of polymers onto the SWNTs.

Subjects/Keywords: SWNT; dispersion; nanocomposites; Polymer Chemistry

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APA (6^th Edition):

Linton, D. (2010). The Importance of Chain Connectivity in the Formation of Non-covalent Interactions between Polymers and Single-walled Carbon Nanotubes and its Impact on Dispersion. (Doctoral Dissertation). University of Tennessee – Knoxville. Retrieved from https://trace.tennessee.edu/utk_graddiss/896

Chicago Manual of Style (16^th Edition):

Linton, Dias. “The Importance of Chain Connectivity in the Formation of Non-covalent Interactions between Polymers and Single-walled Carbon Nanotubes and its Impact on Dispersion.” 2010. Doctoral Dissertation, University of Tennessee – Knoxville. Accessed February 22, 2020. https://trace.tennessee.edu/utk_graddiss/896.

MLA Handbook (7^th Edition):

Linton, Dias. “The Importance of Chain Connectivity in the Formation of Non-covalent Interactions between Polymers and Single-walled Carbon Nanotubes and its Impact on Dispersion.” 2010. Web. 22 Feb 2020.

Vancouver:

Linton D. The Importance of Chain Connectivity in the Formation of Non-covalent Interactions between Polymers and Single-walled Carbon Nanotubes and its Impact on Dispersion. [Internet] [Doctoral dissertation]. University of Tennessee – Knoxville; 2010. [cited 2020 Feb 22]. Available from: https://trace.tennessee.edu/utk_graddiss/896.

Council of Science Editors:

Linton D. The Importance of Chain Connectivity in the Formation of Non-covalent Interactions between Polymers and Single-walled Carbon Nanotubes and its Impact on Dispersion. [Doctoral Dissertation]. University of Tennessee – Knoxville; 2010. Available from: https://trace.tennessee.edu/utk_graddiss/896

McMaster University

27. Zhang, Tianshi. Master's thesis of Tianshi Zhang.

Degree: MASc, 2016, McMaster University

URL: http://hdl.handle.net/11375/20407

► Novel electrocchemical and chemical strategies have been developed for the fabrication of functional nanocomposites. New scientific and engineering contribution of this work to colloidal nanotechnology… (more)

▼ Novel electrocchemical and chemical strategies have been developed for the fabrication of functional nanocomposites. New scientific and engineering contribution of this work to colloidal nanotechnology included the development of advanced chelating dispersing agents, such as various small organic molecules and chelating polymers. The unique feature of such dispersion agents is their strong adsorption on the surface of different materials, which allows superior dispersion. The chelating monomers of chelating polymers, such as PAZO and PMSS provided multiple adsorption sites for bonding to metal atoms on the particles surface. We analyzed and developed new fundamental adsorption and dispersion mechanisms. An important finding was the possibility of co-dispersion and co-deposition of advanced materials such as oxides, nitrides, complex oxides and minerals using universal dispersing agents and formation of composites by EPD method. It was found that Caffeic acid (CA) can be used as an efficient dispersing agent for the synthesis of ZnO nanorods of reduced size and a dispersing agent for the EPD of ZnO films. Another important achievement of this work was the application of tannic acid as an efficient capping and dispersing agent for synthesis and EPD of inorganic materials and composites. An important discovery was the use of lauryl gallate dispersant as a reducing agent for the synthesis of AgNp and a vehicle for particle dispersion and extraction in the liquid-liquid extraction method. Further advancements in our new technologies allowed us to develop composite films using anodic EPD using weak polyelectrolytes, such as alginate. The composite coatings exhibited protective and flame retardant properties. We analyzed the deposition mechanisms and kinetics as well as microstructure of the coatings. In another strategy, we developed electrochemical strategies for the deposition of composites, based on strong polyelectrolytes. The approach is based on the EPD of the polyelectrolyte molecules and electrosynthesis of EPD of ceramic particles. The electrostatic heterocoagulation mechanism was proposed for the deposit formation. We investigated the deposition kinetics, composition and microstructure of the composites prepared by the new strategies. The new electrochemical strategies can be used for the deposition of other composites, based on functional polymers with pH independent charge. New methods have been developed for the chemical synthesis of PPy based composites, using PMSS, PMSS–SR11 and PMSS–SR31 as anionic dopants for chemical polymerization and dispersants for MWCNT. The composites showed promising performance for application in electrodes of electrochemical supercapacitors. Good electrochemical performance was achieved at high active mass loadings. The electrodes showed high capacitance, large voltage window and low impedance. The analysis of electrochemical testing results and chemical structure of PMSS, PMSS–SR11 and PMSS–SR31 provided an insight into the influence of the anionic functional groups on the… Advisors/Committee Members: Zhitomirsky, Igor, Materials Science and Engineering.

Subjects/Keywords: Master's thesis; Nanocomposites; Electrodeoposition; Dispersants

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APA (6^th Edition):

Zhang, T. (2016). Master's thesis of Tianshi Zhang. (Masters Thesis). McMaster University. Retrieved from http://hdl.handle.net/11375/20407

Chicago Manual of Style (16^th Edition):

Zhang, Tianshi. “Master's thesis of Tianshi Zhang.” 2016. Masters Thesis, McMaster University. Accessed February 22, 2020. http://hdl.handle.net/11375/20407.

MLA Handbook (7^th Edition):

Zhang, Tianshi. “Master's thesis of Tianshi Zhang.” 2016. Web. 22 Feb 2020.

Vancouver:

Zhang T. Master's thesis of Tianshi Zhang. [Internet] [Masters thesis]. McMaster University; 2016. [cited 2020 Feb 22]. Available from: http://hdl.handle.net/11375/20407.

Council of Science Editors:

Zhang T. Master's thesis of Tianshi Zhang. [Masters Thesis]. McMaster University; 2016. Available from: http://hdl.handle.net/11375/20407

University of Manchester

28. Li, Zheling. Raman Spectroscopic Studies of the Mechanics of Graphene-based Nanocomposites.

Degree: 2015, University of Manchester

URL: http://www.manchester.ac.uk/escholar/uk-ac-man-scw:267458

► The reinforcement mechanisms in graphene-based nanocomposites have been studied in this project, which primarily consists of three parts: the size and orientation effects of the… (more)

▼ The reinforcement mechanisms in graphene-based nanocomposites have been studied in this project, which primarily consists of three parts: the size and orientation effects of the graphene-based nano-fillers and their interfacial adhesion with the matrix. Overall Raman spectroscopy has been demonstrated to be a powerful technique to study the graphene-based nanocomposites.The deformation of small size graphene has been followed and a new model has been established to consider both the non-uniformity of strain along the graphene and laser intensity within the laser spot, which interprets the observed unusual Raman band shift well. Additionally, the deformation of monolayer graphene oxide (GO) has been followed for the first time. It appears that continuum mechanics is still valid, and the approximately constant strain distribution along the GO flake suggests a better stress transfer efficiency of GO than that of graphene. The spatial orientation of graphene has been studied based on the Raman scattering obtained from transverse sections of graphene, where the Raman bands intensities show a strong polarization dependence. Based on this, a new model has been established to quantify the spatial orientation of graphene in terms of an orientation distribution function, and the spatial orientation of monolayer graphene has been further confirmed by its surface roughness. This model has been extended to a variety of graphene-based materials and nanocomposites. It is also shown how the spatial orientation of graphene-based fillers affects the mechanical properties of the nanocomposites, through the first determination of the Krenchel orientation factor for nanoplatelets.The findings on both the size and orientation effects have been employed to study the deformation mechanics of bulk GO reinforced nanocomposite films. It has been demonstrated for the first time that the effective modulus of GO can be estimated using the Raman D band shift rate, and this is in agreement with the value measured using conventional mechanical testing. The effective modulus of GO is found to be lower than its Young’s modulus, probably due to the mis-orientation, waviness, wrinkling and agglomeration of the GO fillers. Advisors/Committee Members: KINLOCH, IAN IA, Young, Robert, Kinloch, Ian.

Subjects/Keywords: Graphene; Raman spectroscopy; Nanocomposites; Mechanics

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APA (6^th Edition):

Li, Z. (2015). Raman Spectroscopic Studies of the Mechanics of Graphene-based Nanocomposites. (Doctoral Dissertation). University of Manchester. Retrieved from http://www.manchester.ac.uk/escholar/uk-ac-man-scw:267458

Chicago Manual of Style (16^th Edition):

Li, Zheling. “Raman Spectroscopic Studies of the Mechanics of Graphene-based Nanocomposites.” 2015. Doctoral Dissertation, University of Manchester. Accessed February 22, 2020. http://www.manchester.ac.uk/escholar/uk-ac-man-scw:267458.

MLA Handbook (7^th Edition):

Li, Zheling. “Raman Spectroscopic Studies of the Mechanics of Graphene-based Nanocomposites.” 2015. Web. 22 Feb 2020.

Vancouver:

Li Z. Raman Spectroscopic Studies of the Mechanics of Graphene-based Nanocomposites. [Internet] [Doctoral dissertation]. University of Manchester; 2015. [cited 2020 Feb 22]. Available from: http://www.manchester.ac.uk/escholar/uk-ac-man-scw:267458.

Council of Science Editors:

Li Z. Raman Spectroscopic Studies of the Mechanics of Graphene-based Nanocomposites. [Doctoral Dissertation]. University of Manchester; 2015. Available from: http://www.manchester.ac.uk/escholar/uk-ac-man-scw:267458

Université Catholique de Louvain

29. Sangregorio, Anna. Carbon nanotubes morphology and dispersion in nanocomposites.

Degree: 2016, Université Catholique de Louvain

URL: http://hdl.handle.net/2078.1/thesis:8136

►

The unique properties of carbon nanotubes (CNTs) offer great opportunities for nanocomposites with applications in many different sectors. Carbon nanotubes can be found in electronic… (more)

▼

The unique properties of carbon nanotubes (CNTs) offer great opportunities for nanocomposites with applications in many different sectors. Carbon nanotubes can be found in electronic devices, in application related with transportation, as well as energy and biotechnologies. Currently, the most popular use for carbon nanotubes is as reinforcement for polymer nanocomposites both for electrical and structural applications. CNTs are more efficient compared with other traditional fillers, primarily thanks to the large aspect ratio and surface area which increases the stress transfer and promote the formation of percolation network in the matrix. At the same time, the particular structure of the nanotubes also promotes the aggregation of the nanotubes due to strong Van der Waals attraction between the nanotubes, limiting the final properties of the nanocomposites. The ability to tailor electrical and mechanical properties and to totally employ the potential of CNTs widely depends on the ability to obtain a homogeneous dispersion of the fillers in the polymeric matrix. The influence of the morphology of the CNTs on the dispersion and on the rheological, electrical, mechanical and thermal properties of PC/CNTs and HDPE/CNTs were studied. Different synthesis conditions and different catalysts were tested in order to produce CNTs with different morphology. From the TEM analysis of the samples it was clear that particles produced at high temperature are characterized by larger diameters. Rheology measurements were performed on the samples in order to evaluate the level of dispersion of the nanotubes, showing significant differences between samples produced by different catalysts. Various nanocomposites were produced by micro compounding experiments in order to study the electrical properties of the samples and to discriminate the best ones. Finally, a study concerning the electrical and mechanical properties of specimens produced by injection molding was performed.

Master [120] : ingénieur civil en chimie et science des matériaux, Université catholique de Louvain, 2016

Advisors/Committee Members: UCL - Ecole polytechnique de Louvain, Bailly, Christian, Claes, Michael.

Subjects/Keywords: Carbon nanotubes; morphology; dispersion; nanocomposites

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APA (6^th Edition):

Sangregorio, A. (2016). Carbon nanotubes morphology and dispersion in nanocomposites. (Thesis). Université Catholique de Louvain. Retrieved from http://hdl.handle.net/2078.1/thesis:8136

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Sangregorio, Anna. “Carbon nanotubes morphology and dispersion in nanocomposites.” 2016. Thesis, Université Catholique de Louvain. Accessed February 22, 2020. http://hdl.handle.net/2078.1/thesis:8136.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Sangregorio, Anna. “Carbon nanotubes morphology and dispersion in nanocomposites.” 2016. Web. 22 Feb 2020.

Vancouver:

Sangregorio A. Carbon nanotubes morphology and dispersion in nanocomposites. [Internet] [Thesis]. Université Catholique de Louvain; 2016. [cited 2020 Feb 22]. Available from: http://hdl.handle.net/2078.1/thesis:8136.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Sangregorio A. Carbon nanotubes morphology and dispersion in nanocomposites. [Thesis]. Université Catholique de Louvain; 2016. Available from: http://hdl.handle.net/2078.1/thesis:8136

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Virginia Tech

30. Inglefield Jr, David Lott. Tailoring Intermolecular Interactions for High-Performance Nanocomposites.

Degree: PhD, Chemistry, 2014, Virginia Tech

URL: http://hdl.handle.net/10919/64411

► Acid oxidation of multi-walled carbon nanotubes (MWCNTs) introduced carboxylic acid sites onto the MWCNT surface, which permitted further functionalization. Derivatization of carboxylic acid sites yielded… (more)

▼ Acid oxidation of multi-walled carbon nanotubes (MWCNTs) introduced carboxylic acid sites onto the MWCNT surface, which permitted further functionalization. Derivatization of carboxylic acid sites yielded amide-amine and amide-urea functionalized MWCNTs from oxidized precursors. Conventional MWCNT characterization techniques including X-ray photoelectron spectroscopy (XPS), thermogravimetric analysis (TGA), and Raman spectroscopy supported successful MWCNT functionalization. Incorporation of MWCNTs functionalized with hydrogen bonding groups into a segmented polyurethane matrix led to an increase in mechanical properties at optimized MWCNT loadings, in contrast with non-functionalized MWCNTs that resulted in mechanical property decreases across all loadings. Dynamic mechanical analysis (DMA) demonstrated an increase in the polyurethane-MWCNT composite flow temperature with increasing hydrogen bonding MWCNT incorporation, as opposed to non-functionalized MWCNT composites which displayed no significant change in flow temperature. Variable temperature Fourier transform infrared spectroscopy (VT FT-IR) probed temperature-dependent hydrogen bonding in the polyurethane-MWCNT composites and revealed a significant impact on composite hydrogen bonding interactions upon MWCNT incorporation, which was amplified in composites formed using hydrogen bonding functionalized MWCNTs. Acid oxidation of carbon nanohorns (CNHs) yielded carboxylic acid functionalized CNHs, providing sites for further reaction with histamine to afford histamine-functionalized CNHs (His-CNHs). Raman spectroscopy, XPS and TGA confirmed successful functionalization. Transmission electron microscopy (TEM) demonstrated that His-CNHs efficiently complex quantum dots (QDs) through imidazole-Zn interactions. Combination of His-CNHs, QDs, and a poly(oligo-(ethylene glycol9) methyl ether methacrylate)-block-poly(4-vinyl imidazole) copolymer using an interfacial complexation technique afforded stable ternary nanocomplexes with average hydrodynamic diameters under 100 nm. These ternary nanocomplexes represent promising materials for photothermal cancer theranostics due to their size and stability. The efficient reaction of 2-isocyanatoethyl methacrylate with amines afforded urea-containing methacrylic monomers, where the amine-derived pendant groups determined the polymer Tg. Reversible addition-fragmentation chain-transfer (RAFT) polymerization enabled the synthesis of ABA triblock copolymers with urea-containing methacrylic outer blocks and poly(2-ethylhexyl methacrylate) inner blocks. These ABA triblocks copolymers displayed composition dependent phase-separated morphologies and desirable mechanical properties. The urea-containing polymers efficiently complexed gold nanoparticles through urea-gold interactions. Furthermore, urea-containing methacrylic polymers served as a useful matrix for incorporation of silica-coated upconverting nanoparticles, affording upconverting nanoparticle composite films.The novel ionene monomer… Advisors/Committee Members: Long, Timothy E. (committeechair), Dorn, Harry C. (committee member), Rylander, M Nichole (committee member), Moore, Robert Bowen (committee member).

Subjects/Keywords: polymer nanocomposites; carbon nanomaterials; nanoparticles

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APA (6^th Edition):

Inglefield Jr, D. L. (2014). Tailoring Intermolecular Interactions for High-Performance Nanocomposites. (Doctoral Dissertation). Virginia Tech. Retrieved from http://hdl.handle.net/10919/64411

Chicago Manual of Style (16^th Edition):

Inglefield Jr, David Lott. “Tailoring Intermolecular Interactions for High-Performance Nanocomposites.” 2014. Doctoral Dissertation, Virginia Tech. Accessed February 22, 2020. http://hdl.handle.net/10919/64411.

MLA Handbook (7^th Edition):

Inglefield Jr, David Lott. “Tailoring Intermolecular Interactions for High-Performance Nanocomposites.” 2014. Web. 22 Feb 2020.

Vancouver:

Inglefield Jr DL. Tailoring Intermolecular Interactions for High-Performance Nanocomposites. [Internet] [Doctoral dissertation]. Virginia Tech; 2014. [cited 2020 Feb 22]. Available from: http://hdl.handle.net/10919/64411.

Council of Science Editors:

Inglefield Jr DL. Tailoring Intermolecular Interactions for High-Performance Nanocomposites. [Doctoral Dissertation]. Virginia Tech; 2014. Available from: http://hdl.handle.net/10919/64411

Open Access Theses and Dissertations