subject:(Polymeric composites)

University of Oklahoma

1. Grace, Landon. Non-Fickian Three-Dimensional Moisture Absorption in Polymeric Composites: Development and Validation of Hindered Diffusion Model.

Degree: PhD, 2012, University of Oklahoma

URL: http://hdl.handle.net/11244/319198

► The three-dimensional anisotropic moisture absorption behavior of a quartz-fiber-reinforced bismaleimide (BMI) laminate is investigated by collecting 21 months of experimental gravimetric data. Laminates of six,… (more)

Subjects/Keywords: Polymeric composites

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APA (6^th Edition):

Grace, L. (2012). Non-Fickian Three-Dimensional Moisture Absorption in Polymeric Composites: Development and Validation of Hindered Diffusion Model. (Doctoral Dissertation). University of Oklahoma. Retrieved from http://hdl.handle.net/11244/319198

Chicago Manual of Style (16^th Edition):

Grace, Landon. “Non-Fickian Three-Dimensional Moisture Absorption in Polymeric Composites: Development and Validation of Hindered Diffusion Model.” 2012. Doctoral Dissertation, University of Oklahoma. Accessed January 22, 2020. http://hdl.handle.net/11244/319198.

MLA Handbook (7^th Edition):

Grace, Landon. “Non-Fickian Three-Dimensional Moisture Absorption in Polymeric Composites: Development and Validation of Hindered Diffusion Model.” 2012. Web. 22 Jan 2020.

Vancouver:

Grace L. Non-Fickian Three-Dimensional Moisture Absorption in Polymeric Composites: Development and Validation of Hindered Diffusion Model. [Internet] [Doctoral dissertation]. University of Oklahoma; 2012. [cited 2020 Jan 22]. Available from: http://hdl.handle.net/11244/319198.

Council of Science Editors:

Grace L. Non-Fickian Three-Dimensional Moisture Absorption in Polymeric Composites: Development and Validation of Hindered Diffusion Model. [Doctoral Dissertation]. University of Oklahoma; 2012. Available from: http://hdl.handle.net/11244/319198

Ryerson University

2. Roy, Kavya. Numerical modelling of impact damage on carbon fiber reinforced polymer laminates.

Degree: 2014, Ryerson University

URL: https://digital.library.ryerson.ca/islandora/object/RULA%3A3437

► In recent years, the usage of carbon fiber reinforced polymers in the aviation industry has increased significantly. While numerous advancements have been made in the… (more)

Subjects/Keywords: Polymeric composites; Composite materials

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APA (6^th Edition):

Roy, K. (2014). Numerical modelling of impact damage on carbon fiber reinforced polymer laminates. (Thesis). Ryerson University. Retrieved from https://digital.library.ryerson.ca/islandora/object/RULA%3A3437

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):

Roy, Kavya. “Numerical modelling of impact damage on carbon fiber reinforced polymer laminates.” 2014. Thesis, Ryerson University. Accessed January 22, 2020. https://digital.library.ryerson.ca/islandora/object/RULA%3A3437.

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

MLA Handbook (7^th Edition):

Roy, Kavya. “Numerical modelling of impact damage on carbon fiber reinforced polymer laminates.” 2014. Web. 22 Jan 2020.

Vancouver:

Roy K. Numerical modelling of impact damage on carbon fiber reinforced polymer laminates. [Internet] [Thesis]. Ryerson University; 2014. [cited 2020 Jan 22]. Available from: https://digital.library.ryerson.ca/islandora/object/RULA%3A3437.

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

Council of Science Editors:

Roy K. Numerical modelling of impact damage on carbon fiber reinforced polymer laminates. [Thesis]. Ryerson University; 2014. Available from: https://digital.library.ryerson.ca/islandora/object/RULA%3A3437

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

Oregon State University

3. Oriakhi, Christopher O., 1960-. Studies on the synthesis and characterization of polymer-containing nanocomposite materials.

Degree: PhD, Chemistry, 1996, Oregon State University

URL: http://hdl.handle.net/1957/34835

Subjects/Keywords: Polymeric composites

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APA (6^th Edition):

Oriakhi, Christopher O., 1. (1996). Studies on the synthesis and characterization of polymer-containing nanocomposite materials. (Doctoral Dissertation). Oregon State University. Retrieved from http://hdl.handle.net/1957/34835

Chicago Manual of Style (16^th Edition):

Oriakhi, Christopher O., 1960-. “Studies on the synthesis and characterization of polymer-containing nanocomposite materials.” 1996. Doctoral Dissertation, Oregon State University. Accessed January 22, 2020. http://hdl.handle.net/1957/34835.

MLA Handbook (7^th Edition):

Oriakhi, Christopher O., 1960-. “Studies on the synthesis and characterization of polymer-containing nanocomposite materials.” 1996. Web. 22 Jan 2020.

Vancouver:

Oriakhi, Christopher O. 1. Studies on the synthesis and characterization of polymer-containing nanocomposite materials. [Internet] [Doctoral dissertation]. Oregon State University; 1996. [cited 2020 Jan 22]. Available from: http://hdl.handle.net/1957/34835.

Council of Science Editors:

Oriakhi, Christopher O. 1. Studies on the synthesis and characterization of polymer-containing nanocomposite materials. [Doctoral Dissertation]. Oregon State University; 1996. Available from: http://hdl.handle.net/1957/34835

Drexel University

4. Liang, Ya. Functional polymer-polymer composites by nano/meso-fiber encapsulation: applications in drug delivery systems and polymer toughening.

Degree: 2010, Drexel University

URL: http://hdl.handle.net/1860/3316

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This research focuses on developing functional polymer-polymer composites through fiber encapsulation. Two composite systems, poly(lactide-co-glycolide) (PLGA) – poly(vinyl alcohol) (PVA) and polypropylene (PP) – vinyl… (more)

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This research focuses on developing functional polymer-polymer composites through fiber encapsulation. Two composite systems, poly(lactide-co-glycolide) (PLGA) – poly(vinyl alcohol) (PVA) and polypropylene (PP) – vinyl ester (VE), were investigated. The goal was to evaluate these systems for their potential applications in drug delivery and polymer toughening.Sustained, controlled release of therapeutics and mechanical stability are desired in most drug delivery systems. This can be achieved by combining PLGA and PVA. The drug release rate mainly depends on the degradation rate of PLGA, while mechanical stability is maintained by PVA hydrogels. In this work, degradation behaviors of PLGA fibers and mechanical properties of PLGA-PVA composites were investigated during incubation in PBS (pH = 7.4) at 37°C. The size of nanofibers and the PVA matrix did not have a significant impact on the degradation rate. Degradation of PLGA fibers followed pseudo first-order kinetics. PVA matrix reduced mat shrinkage from 85% to 30% and maintained mechanical integrity of composites under incubation conditions. A gradual increase of tensile strengths and moduli of composites were observed after incubation for up to eight weeks, which was comparable to PVA hydrogels.Thermosetting resins have good chemical and mechanical properties. However they are brittle, thus limiting their use in high performance composite materials. Rubber particles are usually used to toughen thermosetting resins, but they also greatly reduce mechanical properties. Rigid thermoplastic polymers have been investigated as toughening materials while limiting the loss of mechanical properties. In this work, small diameter PP fibers were used to toughen VE resins. Results showed that PP greatly enhanced fracture toughness, but reduced mechanical strength of VE as voids were observed at the interface. Interfacial discontinuities of composites were improved after a plasma-based surface modification using vinyltrimethoxysilane (VTMS) was conducted on PP fibers. VTMS-grafting on PP did not significantly improve mechanical properties of the composite, but slightly increased fracture toughness by improving load transfer from VE to PP.Overall, the PLGA-PVA system had a controllable degradation rate and desired mechanical stability for use in drug delivery systems, while the PP-VE system provided valuable information on toughening mechanisms of thermoplastic fibers and on toughening phase selection.

Ph.D., Chemical Engineering – Drexel University, 2010

Advisors/Committee Members: Palmese, Giuseppe R., Lowman, Anthony M..

Subjects/Keywords: Chemical engineering; Polymeric composites; Colloids

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APA (6^th Edition):

Liang, Y. (2010). Functional polymer-polymer composites by nano/meso-fiber encapsulation: applications in drug delivery systems and polymer toughening. (Thesis). Drexel University. Retrieved from http://hdl.handle.net/1860/3316

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):

Liang, Ya. “Functional polymer-polymer composites by nano/meso-fiber encapsulation: applications in drug delivery systems and polymer toughening.” 2010. Thesis, Drexel University. Accessed January 22, 2020. http://hdl.handle.net/1860/3316.

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

MLA Handbook (7^th Edition):

Liang, Ya. “Functional polymer-polymer composites by nano/meso-fiber encapsulation: applications in drug delivery systems and polymer toughening.” 2010. Web. 22 Jan 2020.

Vancouver:

Liang Y. Functional polymer-polymer composites by nano/meso-fiber encapsulation: applications in drug delivery systems and polymer toughening. [Internet] [Thesis]. Drexel University; 2010. [cited 2020 Jan 22]. Available from: http://hdl.handle.net/1860/3316.

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

Council of Science Editors:

Liang Y. Functional polymer-polymer composites by nano/meso-fiber encapsulation: applications in drug delivery systems and polymer toughening. [Thesis]. Drexel University; 2010. Available from: http://hdl.handle.net/1860/3316

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

Hong Kong University of Science and Technology

5. Zheng, Qingbin. Synthesis of graphene sheets and their application for transparent conductors.

Degree: 2011, Hong Kong University of Science and Technology

URL: http://repository.ust.hk/ir/Record/1783.1-7357 ; https://doi.org/10.14711/thesis-b1155656 ; http://repository.ust.hk/ir/bitstream/1783.1-7357/1/th_redirect.html

► Graphene, a monolayer of sp2-bonded carbon atoms or one monolayer of graphite, has a special atomically thick two dimensional structure and possesses unique mechanical, electrical,… (more)

▼ Graphene, a monolayer of sp2-bonded carbon atoms or one monolayer of graphite, has a special atomically thick two dimensional structure and possesses unique mechanical, electrical, thermal and optical properties. These properties make graphene a good candidate material for transparent conductors. Monolayer graphene oxide (GO) sheets with sizes ranging from a few to ~200 μm are synthesized based on a chemical method. In order to obtain ultra-large graphene oxide (UL-GO), three main modifications were made in our experiments: i) using the natural graphite with a large lateral size (up to ~800 μm) as starting material; ii) using intercalation and thermal shock to perform exfoliation, avoiding the destructive process of ultrasonication; iii) using a three-step centrifugation to sort the GO by sheet size. New thermal and chemical schemes, which include (i) a modified thermal treatment, (ii) acid treatment in a HNO3 bath and (iii) doping by immersing in a SOBr2 solution, are developed to treat graphene films to improve the electrical conductivity and transparency. It is shown that a longer thermal treatment at 1100 ⁰C as well as additional acid and doping treatments reduce the sheet resistance by about 20–50% with improved transmittance. The final product has a sheet resistance of 1600 Ω/sq and a transparency of 82%, which is quite sufficient to replace the transparent conducting films made from indium tin oxide for many existing applications in photovoltaic cells and optoelectronics. The transmittance and sheet resistance measured after 3 months of exposure to air confirms the stability of the improved characteristics after the additional treatments. Transparent conductive films are produced using the ultra-large graphene oxide (UL-GO) sheets that are deposited layer-by-layer on a substrate using the Langmuir-Blodgett (L-B) assembly technique. The density and degree of wrinkling of the UL-GO monolayers are turned from dilute, close-packed flat UL-GO to graphene oxide wrinkles (GOWs) and concentrated graphene oxide wrinkles (CGOWs) by varying the LB processing conditions. The method demonstrated here opens up a new avenue for high-yield fabrication of GOWs or CGOWs that are considered promising materials for hydrogen storage, supercapacitors, and nanomechanical devices. The films produced from UL-GO sheets with a close-packed flat structure exhibit exceptionally high electrical conductivity and transparency after thermal reduction and chemical doping treatments. A remarkable sheet resistance of ~500 Ω/sq at 90% transparency is obtained, which outperforms the graphene films grown on a Ni substrate by chemical vapor deposition. The technique used in this work to produce transparent conductive UL-GO thin films is facile, inexpensive, and tunable for mass production. Regarding the theoretical part, the effects of the degree of functionalization, molecular structure and molecular weight of functional groups on the Young’s modulus of graphene sheets were investigated through molecular dynamics and molecular mechanics…

Subjects/Keywords: Polymeric composites ; Graphene ; Transparent electronics

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APA (6^th Edition):

Zheng, Q. (2011). Synthesis of graphene sheets and their application for transparent conductors. (Thesis). Hong Kong University of Science and Technology. Retrieved from http://repository.ust.hk/ir/Record/1783.1-7357 ; https://doi.org/10.14711/thesis-b1155656 ; http://repository.ust.hk/ir/bitstream/1783.1-7357/1/th_redirect.html

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):

Zheng, Qingbin. “Synthesis of graphene sheets and their application for transparent conductors.” 2011. Thesis, Hong Kong University of Science and Technology. Accessed January 22, 2020. http://repository.ust.hk/ir/Record/1783.1-7357 ; https://doi.org/10.14711/thesis-b1155656 ; http://repository.ust.hk/ir/bitstream/1783.1-7357/1/th_redirect.html.

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

MLA Handbook (7^th Edition):

Zheng, Qingbin. “Synthesis of graphene sheets and their application for transparent conductors.” 2011. Web. 22 Jan 2020.

Vancouver:

Zheng Q. Synthesis of graphene sheets and their application for transparent conductors. [Internet] [Thesis]. Hong Kong University of Science and Technology; 2011. [cited 2020 Jan 22]. Available from: http://repository.ust.hk/ir/Record/1783.1-7357 ; https://doi.org/10.14711/thesis-b1155656 ; http://repository.ust.hk/ir/bitstream/1783.1-7357/1/th_redirect.html.

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

Council of Science Editors:

Zheng Q. Synthesis of graphene sheets and their application for transparent conductors. [Thesis]. Hong Kong University of Science and Technology; 2011. Available from: http://repository.ust.hk/ir/Record/1783.1-7357 ; https://doi.org/10.14711/thesis-b1155656 ; http://repository.ust.hk/ir/bitstream/1783.1-7357/1/th_redirect.html

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

Hong Kong University of Science and Technology

6. Liu, Yajing. Functional acetylenic polymers : new strategies, properties and applications.

Degree: 2016, Hong Kong University of Science and Technology

URL: http://repository.ust.hk/ir/Record/1783.1-87135 ; https://doi.org/10.14711/thesis-b1626135 ; http://repository.ust.hk/ir/bitstream/1783.1-87135/1/th_redirect.html

► The development of novel polymerization routes towards functional polymers is always of great importance to polymer chemists and material scientists. Among the numerous monomers, those… (more)

▼ The development of novel polymerization routes towards functional polymers is always of great importance to polymer chemists and material scientists. Among the numerous monomers, those containing carbon-carbon triple bonds serve as versatile monomers for the construction of functional polymers with various constructing units, including triple bonds, double bonds, aromatic rings, fused rings and heterocycles, etc. In this program, I intended to develop a series of new synthetic methodologies for acetylenic polymers based on efficient organic reactions from terminal or internal alkynes as the monomers. Most of the polymers contain luminogens with aggregation-induced emission characteristics (AIEgens) in their structures, and exhibit interesting photophysical properties. Chapter 1 gives a brief introduction to the definition of acetylenic polymers. Their synthesis methodologies are typed into three categories based on the components: homo-polymerization, two-component polyannulation and multi-component polymerization. Some symbolic properties and functionalities of the polymers are exhibited with examples. This chapter also mentions remained problems and raises the perspectives in this research field. Finally, the thesis objective and research strategies of my PhD study is summarized. Chapters 2-7 are related to the development of new polymerization methods and investigation on the properties and applications of the generated polymers. Chapters 2 and 3 discuss three-component polymerizations of alkynes to generate poly(dipropargyl amine)s and poly(tetraphenyl ethene)s, respectively, while two-component polyannulation or polycoupling reactions are investigated in Chapters 4-7. Polymerizations in Chapters 2 and 7 utilize terminal alkynes as monomers, while internal diynes are used in Chapters 3-6. Polymers generated in this thesis program have the skeletons containing carbon-carbon triple bonds (Chapter 2), C=C double bonds (Chapters 3 and 6), benzene rings (Chapter 7) or fused heterocyclic rings (Chapters 4-5). Also, some polymers are endowed with AIE features by in situ generation of AIEgens in their structures (Chapters 3 and 6), and the rest are incorporated with chromophores via proper design of the monomers structures. In each chapter, a research background of the project is introduced first, and then experimental details of the polymerization and the process of condition optimization are described. IR and NMR spectroscopies are utilized to characterize the structures of the polymers, and usually model reactions are conducted for comparison or mechanism study. The optical properties of the optical-active polymers are investigated by UV and PL spectroscopy in solution, aggregate or solid state. Preparation of polymer films allows the following study of their refractivity and photopatterning capability. Some other properties, such as thermal stability and solubility are also tested in order to explore their potentials in many real-world applications. Besides, some interesting functionalities, such as quantitative…

Subjects/Keywords: Polymeric composites ; Acetylene compounds ; Synthesis

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APA (6^th Edition):

Liu, Y. (2016). Functional acetylenic polymers : new strategies, properties and applications. (Thesis). Hong Kong University of Science and Technology. Retrieved from http://repository.ust.hk/ir/Record/1783.1-87135 ; https://doi.org/10.14711/thesis-b1626135 ; http://repository.ust.hk/ir/bitstream/1783.1-87135/1/th_redirect.html

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):

Liu, Yajing. “Functional acetylenic polymers : new strategies, properties and applications.” 2016. Thesis, Hong Kong University of Science and Technology. Accessed January 22, 2020. http://repository.ust.hk/ir/Record/1783.1-87135 ; https://doi.org/10.14711/thesis-b1626135 ; http://repository.ust.hk/ir/bitstream/1783.1-87135/1/th_redirect.html.

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

MLA Handbook (7^th Edition):

Liu, Yajing. “Functional acetylenic polymers : new strategies, properties and applications.” 2016. Web. 22 Jan 2020.

Vancouver:

Liu Y. Functional acetylenic polymers : new strategies, properties and applications. [Internet] [Thesis]. Hong Kong University of Science and Technology; 2016. [cited 2020 Jan 22]. Available from: http://repository.ust.hk/ir/Record/1783.1-87135 ; https://doi.org/10.14711/thesis-b1626135 ; http://repository.ust.hk/ir/bitstream/1783.1-87135/1/th_redirect.html.

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

Council of Science Editors:

Liu Y. Functional acetylenic polymers : new strategies, properties and applications. [Thesis]. Hong Kong University of Science and Technology; 2016. Available from: http://repository.ust.hk/ir/Record/1783.1-87135 ; https://doi.org/10.14711/thesis-b1626135 ; http://repository.ust.hk/ir/bitstream/1783.1-87135/1/th_redirect.html

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

Baylor University

7. Zhang, Cong, 1986-. Modeling of flexible fiber motion and prediction of material properties.

Degree: Engineering., 2011, Baylor University

URL: http://hdl.handle.net/2104/8251

► This work employs the rod chain model of Wang et al. (2006) to study the motion of discrete flexible fibers. Results are presented for both… (more)

Subjects/Keywords: Fiber reinforced composites.; Polymeric composites.; Modeling.; Simulation.

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APA (6^th Edition):

Zhang, Cong, 1. (2011). Modeling of flexible fiber motion and prediction of material properties. (Thesis). Baylor University. Retrieved from http://hdl.handle.net/2104/8251

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):

Zhang, Cong, 1986-. “Modeling of flexible fiber motion and prediction of material properties. ” 2011. Thesis, Baylor University. Accessed January 22, 2020. http://hdl.handle.net/2104/8251.

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

MLA Handbook (7^th Edition):

Zhang, Cong, 1986-. “Modeling of flexible fiber motion and prediction of material properties. ” 2011. Web. 22 Jan 2020.

Vancouver:

Zhang, Cong 1. Modeling of flexible fiber motion and prediction of material properties. [Internet] [Thesis]. Baylor University; 2011. [cited 2020 Jan 22]. Available from: http://hdl.handle.net/2104/8251.

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

Council of Science Editors:

Zhang, Cong 1. Modeling of flexible fiber motion and prediction of material properties. [Thesis]. Baylor University; 2011. Available from: http://hdl.handle.net/2104/8251

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

Hong Kong University of Science and Technology

8. Zhang, Lei MAE. Study on organics-accelerated benzoxazine polymerization and the structure-property relationship.

Degree: 2017, Hong Kong University of Science and Technology

URL: http://repository.ust.hk/ir/Record/1783.1-97182 ; https://doi.org/10.14711/thesis-b1781046 ; http://repository.ust.hk/ir/bitstream/1783.1-97182/1/th_redirect.html

► Polybenzoxazine constitutes a new generation of thermosets, which inherits the advantages from phenolic resins while overcomes the drawbacks. The other unique properties, such as low… (more)

▼ Polybenzoxazine constitutes a new generation of thermosets, which inherits the advantages from phenolic resins while overcomes the drawbacks. The other unique properties, such as low curing shrinkage, low water absorption and good molecular design flexibility, make it a potential candidate in adhesives, microelectronic packaging as well as aerospace engineering. However, conventional benzoxazines are mostly solid under room temperature and require high curing temperature, which complicate their processing and limit their commercialization. Brønsted acids and Lewis acids are efficient accelerators for benzoxazine polymerization. But they are prohibited in electronics, metal adhension and outdoor applications due to the halogen and metal elements, corrosive acidic attributes and moisture sensitivity. Organics like phenol and thiol are effective accelerators without the aforementioned disadvantages. However, when they are used as the accelerators, the properties of the materials are worse than that of their thermally cured counterparts. Amine is a newly discovered accelerator for benzoxazine. By carefully designing the molecular structure of amine, it is possible to accelerate benzoxazine polymerization as well as enhance material properties. Unfortunately, the mechanism of benzoxazine/amine reaction is still not very clear to date. Thus, it is of significant importance to investigate the reaction mechanism and establish the structure-property relationship in order to provide the guideline for accelerator design. Therefore, the aim of the thesis is to 1) develop new benzoxazine and benzoxazine/epoxy system with good processability and material properties; 2) establish the structure-property relationship; 3) investigate the reaction mechanism of benzoxazine and amine 4) introduce a new methodology for developing accelerators to benefit both polymerization and material properties. The first part of the thesis reports the development of a new benzoxazine through convenient preparation method with inexpensive raw materials to overcome the challenges of high liquefying and curing temperature. The product is liquid under room temperature with a low viscosity suitable for resin transfer molding. The incorporated amine accelerates the polymerization at low temperature, which is much faster than that of conventional benzoxazine. By copolymerization with epoxy, the obtained copolymers show better material performances, which include higher glass transition temperature, higher char yield, high flexural modulus and strength. The second part focuses on establishing the structure-property relationship of benzoxazine and amine. Phenylenediamine isomers are selected in this part of study and the directing effect of amino group on aryl ring is highlighted. Other than the conventional amine-attacking path when any kind of amine is used, aryl-attacking path is found only when meta-isomer is applied. The new path siginificantly changes the reactivity of meta-isomer with benzoxazine and dramatically influences the material properties. Due…

Subjects/Keywords: Thermosetting composites ; Polymeric composites ; Thermal properties

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APA (6^th Edition):

Zhang, L. M. (2017). Study on organics-accelerated benzoxazine polymerization and the structure-property relationship. (Thesis). Hong Kong University of Science and Technology. Retrieved from http://repository.ust.hk/ir/Record/1783.1-97182 ; https://doi.org/10.14711/thesis-b1781046 ; http://repository.ust.hk/ir/bitstream/1783.1-97182/1/th_redirect.html

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):

Zhang, Lei MAE. “Study on organics-accelerated benzoxazine polymerization and the structure-property relationship.” 2017. Thesis, Hong Kong University of Science and Technology. Accessed January 22, 2020. http://repository.ust.hk/ir/Record/1783.1-97182 ; https://doi.org/10.14711/thesis-b1781046 ; http://repository.ust.hk/ir/bitstream/1783.1-97182/1/th_redirect.html.

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

MLA Handbook (7^th Edition):

Zhang, Lei MAE. “Study on organics-accelerated benzoxazine polymerization and the structure-property relationship.” 2017. Web. 22 Jan 2020.

Vancouver:

Zhang LM. Study on organics-accelerated benzoxazine polymerization and the structure-property relationship. [Internet] [Thesis]. Hong Kong University of Science and Technology; 2017. [cited 2020 Jan 22]. Available from: http://repository.ust.hk/ir/Record/1783.1-97182 ; https://doi.org/10.14711/thesis-b1781046 ; http://repository.ust.hk/ir/bitstream/1783.1-97182/1/th_redirect.html.

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

Council of Science Editors:

Zhang LM. Study on organics-accelerated benzoxazine polymerization and the structure-property relationship. [Thesis]. Hong Kong University of Science and Technology; 2017. Available from: http://repository.ust.hk/ir/Record/1783.1-97182 ; https://doi.org/10.14711/thesis-b1781046 ; http://repository.ust.hk/ir/bitstream/1783.1-97182/1/th_redirect.html

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

9. Grison, Karine. Desenvolvimento, caracterização e avaliação das propriedades mecânicas, térmicas e morfológicas de compósitos de polietileno de alta densidade reforçados com pó de pinus taeda e/ou alumina calcinada.

Degree: 2015, Universidade de Caxias do Sul

URL: https://repositorio.ucs.br/handle/11338/995

►

Este trabalho teve como objetivo o desenvolvimento, avaliação e caracterização de compósitos com matriz polimérica de polietileno de alta densidade (HDPE) e com madeira de… (more)

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Este trabalho teve como objetivo o desenvolvimento, avaliação e caracterização de compósitos com matriz polimérica de polietileno de alta densidade (HDPE) e com madeira de Pinus taeda, alumina calcinada e agentes compatibilizantes. Foram desenvolvidos compósitos com um ou dois componentes incorporados à matriz polimérica e realizada a análise das propriedades mecânicas, morfológicas, dinâmico-mecânicas e térmicas destes compósitos. Preliminarmente foram desenvolvidas vinte e seis formulações com granulometrias diversas para suas cargas, percentuais de pó de madeira variados e dois tipos de agentes compatibilizantes. Após ensaios mecânicos realizados com estas vinte e seis formulações elegeram-se as que apresentaram os maiores valores para a propriedade de resistência a flexão e deu-se continuidade ao restante dos ensaios. Utilizou-se o processo de extrusão para obtenção de pellet's homogeneizados dos compósitos e moldou-se os corpos de prova em processo de injeção. Os resultados diferenciados para as propriedades mecânicas foram obtidos com as composições com o percentual maior de madeira e dois componentes simultaneamente, sendo que o compósito PE24M4A2MA (70% HDPE, 24% madeira, 4% alumina, 2% HDPE-g-MA) apresentou valores superiores ao do HDPE puro em 41% na resistência à tração e 101% na resistência à flexão, e a composição PE19M9A2MA (70% HDPE, 19% madeira, 9% alumina, 2% HDPE-g-MA) apresentou valores superiores ao do HDPE puro em 34,6% na resistência à tração e 81,30% na resistência à flexão. Nas micrografias observou-se a interação entre a carga vegetal e a matriz polimérica, e a interação parcial da carga mineral e a matriz. Para os módulos de armazenamento e de perda das propriedades dinâmico-mecânicas os resultados superiores também foram obtidos com os compósitos com maior teor de carga vegetal, sendo que o compósito PE24M4A2MA permitiu a obtenção do maior módulo de armazenamento e de perda nas regiões e em comparação com o HDPE e os outros compósitos. A viscosidade do material tendeu a aumentar com a incorporação de cargas, tanto vegetal quanto mineral durante o processo de extrusão e no ensaio de reologia, sendo que os compósitos com maior teor de madeira apresentaram maior viscosidade, provavelmente devido à interação mais efetiva do pó de Pinus taeda com a matriz polimérica.

This work aimed at the development, evaluation and characterization of polymer matrix composites with high density polyethylene (HDPE) and wood of Pinus taeda, calcined alumina and compatibilizers. Composites have been developed with one or two components incorporated into the polymer matrix and conducted the analysis of the mechanical, morphological, dynamicmechanical and thermal properties of these composites. Preliminarily been developed twenty-six formulations with different granulometry to their loads, varying percentages of wood flour and two types of coupling agents. After mechanical tests with these twenty-six formulations were elected those who had the highest values for bending resistance property and was continued…

Advisors/Committee Members: Zattera, Ademir José, Beraldo, Antonio Ludovico, Grisa, Ana Maria Coulon, Santos, Venina dos.

Subjects/Keywords: Polímeros; Compósitos poliméricos; Polymers; Polymeric composites

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APA (6^th Edition):

Grison, K. (2015). Desenvolvimento, caracterização e avaliação das propriedades mecânicas, térmicas e morfológicas de compósitos de polietileno de alta densidade reforçados com pó de pinus taeda e/ou alumina calcinada. (Masters Thesis). Universidade de Caxias do Sul. Retrieved from https://repositorio.ucs.br/handle/11338/995

Chicago Manual of Style (16^th Edition):

Grison, Karine. “Desenvolvimento, caracterização e avaliação das propriedades mecânicas, térmicas e morfológicas de compósitos de polietileno de alta densidade reforçados com pó de pinus taeda e/ou alumina calcinada.” 2015. Masters Thesis, Universidade de Caxias do Sul. Accessed January 22, 2020. https://repositorio.ucs.br/handle/11338/995.

MLA Handbook (7^th Edition):

Grison, Karine. “Desenvolvimento, caracterização e avaliação das propriedades mecânicas, térmicas e morfológicas de compósitos de polietileno de alta densidade reforçados com pó de pinus taeda e/ou alumina calcinada.” 2015. Web. 22 Jan 2020.

Vancouver:

Grison K. Desenvolvimento, caracterização e avaliação das propriedades mecânicas, térmicas e morfológicas de compósitos de polietileno de alta densidade reforçados com pó de pinus taeda e/ou alumina calcinada. [Internet] [Masters thesis]. Universidade de Caxias do Sul; 2015. [cited 2020 Jan 22]. Available from: https://repositorio.ucs.br/handle/11338/995.

Council of Science Editors:

Grison K. Desenvolvimento, caracterização e avaliação das propriedades mecânicas, térmicas e morfológicas de compósitos de polietileno de alta densidade reforçados com pó de pinus taeda e/ou alumina calcinada. [Masters Thesis]. Universidade de Caxias do Sul; 2015. Available from: https://repositorio.ucs.br/handle/11338/995

University of Johannesburg

10. Dlamini, Derrick Sibusiso. Polymer composites and nanofiltration membranes and their application in water treatment.

Degree: 2013, University of Johannesburg

URL: http://hdl.handle.net/10210/8550

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D.Phil. (Chemistry)

Polycaprolactone (PCL), a linear, biodegradable polymer, and ethylene vinyl acetate (EVA), a branched copolymer, were used to prepare PCNs via the melt-blending method.… (more)

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D.Phil. (Chemistry)

Polycaprolactone (PCL), a linear, biodegradable polymer, and ethylene vinyl acetate (EVA), a branched copolymer, were used to prepare PCNs via the melt-blending method. Organoclay of the type Cloisite® 20A (C20A) and bentonite clay were used as fillers. The results show that the structure of a polymer matrix plays a significant role towards compatibilisation with the silicate layers of the clay. Scanning electron microscopy (SEM) and X-ray diffraction (XRD) analyses revealed an exfoliated-intercalated mixed morphology for the PCL matrix. However, for the EVA matrix, silicate layers agglomerated to form tactoids and resulted primarily in an intercalated morphology. Fourier transform infrared (FT-IR) spectroscopy was used to determine the nature of the interactions between the polymer and the filler. The thermal properties were investigated using thermogravimetric analysis (TGA) and indicated that, with an increase in clay loading, the thermal stability was reduced for both matrices, notwithstanding the type of polymer or clay used. Using EVA and C20A, this study revealed that more exfoliated nanocomposite structures can be obtained by using a modified solution-blending technique. This technique is a hybrid of the melt-blending and solution-blending methods. When compared to the melt-blending method, the modified solution method was found to be an efficient method for producing nanocomposite strips with uniform dispersion of the clay at organoclay loading of 8% and crystallinity by extrusion. However, the melt-blending method produced nanocomposites with high porosity, intercalation and thermal stability whereas the modified solution-blending technique resulted in more intercalated-exfoliated morphology, but less porosity and thermal stability. Despite the positives drawn from the modified solution method, the melt-blending method was used throughout for nanocomposites intended for application in water treatment. This was done because the solution used in the modified solution method could not be completely removed from the nanocomposite. Organic solvents can have a negative effect on the environment and human life.

Subjects/Keywords: Polymeric composites; Water purification - Membrane filtration

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

APA (6^th Edition):

Dlamini, D. S. (2013). Polymer composites and nanofiltration membranes and their application in water treatment. (Thesis). University of Johannesburg. Retrieved from http://hdl.handle.net/10210/8550

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):

Dlamini, Derrick Sibusiso. “Polymer composites and nanofiltration membranes and their application in water treatment.” 2013. Thesis, University of Johannesburg. Accessed January 22, 2020. http://hdl.handle.net/10210/8550.

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

MLA Handbook (7^th Edition):

Dlamini, Derrick Sibusiso. “Polymer composites and nanofiltration membranes and their application in water treatment.” 2013. Web. 22 Jan 2020.

Vancouver:

Dlamini DS. Polymer composites and nanofiltration membranes and their application in water treatment. [Internet] [Thesis]. University of Johannesburg; 2013. [cited 2020 Jan 22]. Available from: http://hdl.handle.net/10210/8550.

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

Council of Science Editors:

Dlamini DS. Polymer composites and nanofiltration membranes and their application in water treatment. [Thesis]. University of Johannesburg; 2013. Available from: http://hdl.handle.net/10210/8550

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

Ryerson University

11. Sayyidmousavi, Alireza. Investigation of creep and fatigue in high temperature polymer matrix composites using a micromechanical approach.

Degree: 2014, Ryerson University

URL: https://digital.library.ryerson.ca/islandora/object/RULA%3A3551

► Polymer matrix composites (PMC’s) are widely used in critical aerospace structures due to their numerous advantageous mechanical properties. Recently, PMC’s have been considered for high… (more)

▼ Polymer matrix composites (PMC’s) are widely used in critical aerospace structures due to their numerous advantageous mechanical properties. Recently, PMC’s have been considered for high temperature applications where viscoelasticity arising from the time dependent nature of the polymer matrix becomes an important consideration. This inherent viscoelasticity can significantly influence deformation, strength and failure response of these materials under different loading modes and environmental factors. With a potentially large number of plies of different fiber directions and perhaps material properties, determining a fatigue failure criterion of any degree of generality through experiments only, may seem to be an unrealistic task. This difficult situation may be mitigated through the development of suitable theoretical micro or macro mechanical models that are founded on considering the fatigue failure of the constituting laminas. The micro‐approach provides a detailed examination of the individual failure modes in each of the constituent materials i.e. fiber, matrix. In this work, a micromechanical approach is used to study the role of viscoelasticity on the fatigue behavior of polymer matrix composites. In particular, the study examines the interaction of fatigue and creep in polymer matrix composites. The matrix phase is modeled as a vicoelastic material using Schapery’s single integral constitutive equation. Taking viscoelsticity into account allows the study of creep strain evolution during the fatigue loading. The fatigue failure criterion is expressed in terms of the fatigue failure functions of the constituent materials. The micromechanical model is also used to calculate these fatigue failure functions from the knowledge of the S‐N diagrams of the composite material in longitudinal, transverse and shear loadings thus eliminating the need for any further experimentation. Unlike the previous works, the present study can distinguish between the strain evolution due to fatigue and creep. The results can clearly show the contribution made by the effect of viscoelasticity to the total strain evolution during the fatigue life of the specimen. Although the effect of viscoelsticity is found to increase with temperature, its contribution to strain development during fatigue is compromised by the shorter life of the specimen when compared to lower temperatures. Advisors/Committee Members: Ryerson University (Degree grantor).

Subjects/Keywords: Composite materials; Polymers – Thermal properties; Polymeric composites

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APA (6^th Edition):

Sayyidmousavi, A. (2014). Investigation of creep and fatigue in high temperature polymer matrix composites using a micromechanical approach. (Thesis). Ryerson University. Retrieved from https://digital.library.ryerson.ca/islandora/object/RULA%3A3551

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):

Sayyidmousavi, Alireza. “Investigation of creep and fatigue in high temperature polymer matrix composites using a micromechanical approach.” 2014. Thesis, Ryerson University. Accessed January 22, 2020. https://digital.library.ryerson.ca/islandora/object/RULA%3A3551.

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

MLA Handbook (7^th Edition):

Sayyidmousavi, Alireza. “Investigation of creep and fatigue in high temperature polymer matrix composites using a micromechanical approach.” 2014. Web. 22 Jan 2020.

Vancouver:

Sayyidmousavi A. Investigation of creep and fatigue in high temperature polymer matrix composites using a micromechanical approach. [Internet] [Thesis]. Ryerson University; 2014. [cited 2020 Jan 22]. Available from: https://digital.library.ryerson.ca/islandora/object/RULA%3A3551.

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

Council of Science Editors:

Sayyidmousavi A. Investigation of creep and fatigue in high temperature polymer matrix composites using a micromechanical approach. [Thesis]. Ryerson University; 2014. Available from: https://digital.library.ryerson.ca/islandora/object/RULA%3A3551

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

Queen Mary, University of London

12. Zhang, Xi. Polymer composites incorporating engineered electrospun fibres : flexible design and novel properties for biomedical applications.

Degree: PhD, 2017, Queen Mary, University of London

URL: http://qmro.qmul.ac.uk/xmlui/handle/123456789/30904 ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.766056

► Due to their unique structure and flexible choice of materials, electrospun degradable and biocompatible polymer fibres are considered to be extremely suitable for biomedical applications… (more)

▼ Due to their unique structure and flexible choice of materials, electrospun degradable and biocompatible polymer fibres are considered to be extremely suitable for biomedical applications such as tissue engineering and drug delivery, either on their own or integrated within composites. Conventional electrospun fibre composites are typically based on non-woven mats and therefore limited to simple-curved geometries (films, membranes, etc.). For aqueous composites such as hydrogels, the hydrophobicity of the materials sometimes prohibits fibres to be easily integrated or distributed in these composites. In this thesis, a review on the topic is firstly presented in Chapter 2, introducing and discussing engineering of electrospun fibre as well as their biomedical applications. In Chapter 3, electrospun polylactide (PLA) fibres reinforced poly(trimethylene carbonate) (PTMC) composites are prepared. The composites are loaded with both continuous and short PLA fibres, achieving significant mechanical enhancement and offering opportunities to produce composites conveniently using liquid formulations. Chapter 4 presents the development of shape memory polymer composites based on a combination of PLA fibres and a PTMC matrix. By loading different amounts of short fibres with different aspect ratios or by using plasticisers, the shape memory behaviour is modulated; and composites of more complex geometries are produced. In Chapter 5, PTMC-PLA fibre composites are made into drug release system. Dexamethasone-loaded PLA fibres are integrated into a PTMC matrix, showing sustained drug release and stimulating stem cell osteogenic differentiation. This concept gives promise to loading various drugs into photo-crosslinked structures without denaturation. In Chapter 6, electrospun PLA fibres are functionalized by amphiphilic block copolymer polylactide-block-poly[2-(dimethylamino)ethyl methacrylate] (PLA-b-PDMAEMA) for the development of carboxymethylcellulose composites hydrogels. Functionalization of PLA fibres not only allows for easy integration and dispersion into the hydrogel, but also enhances the interfacial bonding between fibre and hydrogel. In the last chapter (Chapter 7), some conclusions are drawn and future works are discussed.

Subjects/Keywords: Biomaterials; Polymers; polymeric composites biomaterials; biomedical applications

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

APA (6^th Edition):

Zhang, X. (2017). Polymer composites incorporating engineered electrospun fibres : flexible design and novel properties for biomedical applications. (Doctoral Dissertation). Queen Mary, University of London. Retrieved from http://qmro.qmul.ac.uk/xmlui/handle/123456789/30904 ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.766056

Chicago Manual of Style (16^th Edition):

Zhang, Xi. “Polymer composites incorporating engineered electrospun fibres : flexible design and novel properties for biomedical applications.” 2017. Doctoral Dissertation, Queen Mary, University of London. Accessed January 22, 2020. http://qmro.qmul.ac.uk/xmlui/handle/123456789/30904 ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.766056.

MLA Handbook (7^th Edition):

Zhang, Xi. “Polymer composites incorporating engineered electrospun fibres : flexible design and novel properties for biomedical applications.” 2017. Web. 22 Jan 2020.

Vancouver:

Zhang X. Polymer composites incorporating engineered electrospun fibres : flexible design and novel properties for biomedical applications. [Internet] [Doctoral dissertation]. Queen Mary, University of London; 2017. [cited 2020 Jan 22]. Available from: http://qmro.qmul.ac.uk/xmlui/handle/123456789/30904 ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.766056.

Council of Science Editors:

Zhang X. Polymer composites incorporating engineered electrospun fibres : flexible design and novel properties for biomedical applications. [Doctoral Dissertation]. Queen Mary, University of London; 2017. Available from: http://qmro.qmul.ac.uk/xmlui/handle/123456789/30904 ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.766056

Drexel University

13. Gogotsi, Natalie. Interfacial remendability of glass fiber / epoxy composites.

Degree: 2014, Drexel University

URL: http://hdl.handle.net/1860/idea:6064

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The adhesion of reinforcing fibers to the matrix is vital for the load transfer within a reinforced composite. Being able to impart remendability to the… (more)

Subjects/Keywords: Chemical engineering; Polymeric composites; Glass fibers

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APA (6^th Edition):

Gogotsi, N. (2014). Interfacial remendability of glass fiber / epoxy composites. (Thesis). Drexel University. Retrieved from http://hdl.handle.net/1860/idea:6064

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):

Gogotsi, Natalie. “Interfacial remendability of glass fiber / epoxy composites.” 2014. Thesis, Drexel University. Accessed January 22, 2020. http://hdl.handle.net/1860/idea:6064.

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

MLA Handbook (7^th Edition):

Gogotsi, Natalie. “Interfacial remendability of glass fiber / epoxy composites.” 2014. Web. 22 Jan 2020.

Vancouver:

Gogotsi N. Interfacial remendability of glass fiber / epoxy composites. [Internet] [Thesis]. Drexel University; 2014. [cited 2020 Jan 22]. Available from: http://hdl.handle.net/1860/idea:6064.

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

Council of Science Editors:

Gogotsi N. Interfacial remendability of glass fiber / epoxy composites. [Thesis]. Drexel University; 2014. Available from: http://hdl.handle.net/1860/idea:6064

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

Columbia University

14. Freyer, Jessica Leigh. The Design and Synthesis of Aromatic Ion-Based Polyelectrolytes for Divergent Applications.

Degree: 2018, Columbia University

URL: https://doi.org/10.7916/D8F77W2S

► Versatile polyelectrolytes with tunable physical properties have the potential to be transformative in applications ranging from medicine to energy storage. To expand the design space… (more)

Subjects/Keywords: Chemistry; Polyelectrolytes; Polymeric composites; Aromatic compounds

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APA (6^th Edition):

Freyer, J. L. (2018). The Design and Synthesis of Aromatic Ion-Based Polyelectrolytes for Divergent Applications. (Doctoral Dissertation). Columbia University. Retrieved from https://doi.org/10.7916/D8F77W2S

Chicago Manual of Style (16^th Edition):

Freyer, Jessica Leigh. “The Design and Synthesis of Aromatic Ion-Based Polyelectrolytes for Divergent Applications.” 2018. Doctoral Dissertation, Columbia University. Accessed January 22, 2020. https://doi.org/10.7916/D8F77W2S.

MLA Handbook (7^th Edition):

Freyer, Jessica Leigh. “The Design and Synthesis of Aromatic Ion-Based Polyelectrolytes for Divergent Applications.” 2018. Web. 22 Jan 2020.

Vancouver:

Freyer JL. The Design and Synthesis of Aromatic Ion-Based Polyelectrolytes for Divergent Applications. [Internet] [Doctoral dissertation]. Columbia University; 2018. [cited 2020 Jan 22]. Available from: https://doi.org/10.7916/D8F77W2S.

Council of Science Editors:

Freyer JL. The Design and Synthesis of Aromatic Ion-Based Polyelectrolytes for Divergent Applications. [Doctoral Dissertation]. Columbia University; 2018. Available from: https://doi.org/10.7916/D8F77W2S

Michigan State University

15. Smith, Aaron C. Microwave pultrusion of unidirectional reinforced epoxy composites using single frequency and variable frequency processing techniques.

Degree: MS, Department of Chemical Engineering, 1999, Michigan State University

URL: http://etd.lib.msu.edu/islandora/object/etd:27795

Subjects/Keywords: Pultrusion; Polymeric composites

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APA (6^th Edition):

Smith, A. C. (1999). Microwave pultrusion of unidirectional reinforced epoxy composites using single frequency and variable frequency processing techniques. (Masters Thesis). Michigan State University. Retrieved from http://etd.lib.msu.edu/islandora/object/etd:27795

Chicago Manual of Style (16^th Edition):

Smith, Aaron C. “Microwave pultrusion of unidirectional reinforced epoxy composites using single frequency and variable frequency processing techniques.” 1999. Masters Thesis, Michigan State University. Accessed January 22, 2020. http://etd.lib.msu.edu/islandora/object/etd:27795.

MLA Handbook (7^th Edition):

Smith, Aaron C. “Microwave pultrusion of unidirectional reinforced epoxy composites using single frequency and variable frequency processing techniques.” 1999. Web. 22 Jan 2020.

Vancouver:

Smith AC. Microwave pultrusion of unidirectional reinforced epoxy composites using single frequency and variable frequency processing techniques. [Internet] [Masters thesis]. Michigan State University; 1999. [cited 2020 Jan 22]. Available from: http://etd.lib.msu.edu/islandora/object/etd:27795.

Council of Science Editors:

Smith AC. Microwave pultrusion of unidirectional reinforced epoxy composites using single frequency and variable frequency processing techniques. [Masters Thesis]. Michigan State University; 1999. Available from: http://etd.lib.msu.edu/islandora/object/etd:27795

Michigan State University

16. Dang, Xinglai. Testing and simulation of composite laminates under impact loading.

Degree: PhD, Department of Materials Science and Mechanics, 2000, Michigan State University

URL: http://etd.lib.msu.edu/islandora/object/etd:30760

Subjects/Keywords: Polymeric composites – Testing

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

APA (6^th Edition):

Dang, X. (2000). Testing and simulation of composite laminates under impact loading. (Doctoral Dissertation). Michigan State University. Retrieved from http://etd.lib.msu.edu/islandora/object/etd:30760

Chicago Manual of Style (16^th Edition):

Dang, Xinglai. “Testing and simulation of composite laminates under impact loading.” 2000. Doctoral Dissertation, Michigan State University. Accessed January 22, 2020. http://etd.lib.msu.edu/islandora/object/etd:30760.

MLA Handbook (7^th Edition):

Dang, Xinglai. “Testing and simulation of composite laminates under impact loading.” 2000. Web. 22 Jan 2020.

Vancouver:

Dang X. Testing and simulation of composite laminates under impact loading. [Internet] [Doctoral dissertation]. Michigan State University; 2000. [cited 2020 Jan 22]. Available from: http://etd.lib.msu.edu/islandora/object/etd:30760.

Council of Science Editors:

Dang X. Testing and simulation of composite laminates under impact loading. [Doctoral Dissertation]. Michigan State University; 2000. Available from: http://etd.lib.msu.edu/islandora/object/etd:30760

Michigan State University

17. Simpson, Rodney James. Composite materials from recycled multi-layer polypropylene bottles and wood fibers.

Degree: MS, School of Packaging, 1991, Michigan State University

URL: http://etd.lib.msu.edu/islandora/object/etd:22985

Subjects/Keywords: Polymeric composites; Polypropylene

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

APA (6^th Edition):

Simpson, R. J. (1991). Composite materials from recycled multi-layer polypropylene bottles and wood fibers. (Masters Thesis). Michigan State University. Retrieved from http://etd.lib.msu.edu/islandora/object/etd:22985

Chicago Manual of Style (16^th Edition):

Simpson, Rodney James. “Composite materials from recycled multi-layer polypropylene bottles and wood fibers.” 1991. Masters Thesis, Michigan State University. Accessed January 22, 2020. http://etd.lib.msu.edu/islandora/object/etd:22985.

MLA Handbook (7^th Edition):

Simpson, Rodney James. “Composite materials from recycled multi-layer polypropylene bottles and wood fibers.” 1991. Web. 22 Jan 2020.

Vancouver:

Simpson RJ. Composite materials from recycled multi-layer polypropylene bottles and wood fibers. [Internet] [Masters thesis]. Michigan State University; 1991. [cited 2020 Jan 22]. Available from: http://etd.lib.msu.edu/islandora/object/etd:22985.

Council of Science Editors:

Simpson RJ. Composite materials from recycled multi-layer polypropylene bottles and wood fibers. [Masters Thesis]. Michigan State University; 1991. Available from: http://etd.lib.msu.edu/islandora/object/etd:22985

Hong Kong University of Science and Technology

18. Lee, Lai Sheung. Microrheology of CNT/silver epoxy composites.

Degree: 2011, Hong Kong University of Science and Technology

URL: http://repository.ust.hk/ir/Record/1783.1-7140 ; https://doi.org/10.14711/thesis-b1136745 ; http://repository.ust.hk/ir/bitstream/1783.1-7140/1/th_redirect.html

► In the era of high power electronics, voices asking for high performance miniaturized electronic devices are full of our minds. One of the keys in… (more)

▼ In the era of high power electronics, voices asking for high performance miniaturized electronic devices are full of our minds. One of the keys in responding to these strong needs is the use of highly electrical conductive die bonding materials. Those with a strong ability to conduct heat generated during applications are of special interest as overheating of devices is avoided. Currently, tin-lead solders and electrically conductive adhesives are two commonly used die bonding materials in interconnecting components in circuit board. Although solder has a relatively higher conductivity, it has adverse environmental impacts upon disposal, and stringent regulations from European Union Waste Electrical and Electronic Equipment Directive require it to be progressively faded out. Developing high performance die bonding alternatives is an urge and is of great importance. Conductive adhesives especially silver epoxy has been used for decades as die bonding materials since its first application in 1951. It is considered as one of the best ways to replace the leading role of solder in electronic packaging industry due to its ability to devices miniaturization. Its wide applications are limited by its comparably lower conductivities. Enhancement of silver epoxy by incorporation of conductive nano fillers such as carbon nanotubes (CNTs) and nano-silver particles has been found promising recently. However, the addition of nano particles leads to drastic increase in the viscosity of the adhesive or decrease in processability. To ensure an effective use of these nano fillers without changing the process abilities during practical applications, understanding of the microrheological properties of the nano filler/silver epoxy adhesives becomes paramount. In this study, we systematically investigated the effect of matrix viscoelasticity on CNTs dispersion using optical microscopy (OM), transmission electron microscopy (TEM) and dynamic rheometry. We discovered that the best dispersion system is a ternary mixture of silver epoxy containing nano [email protected] and acid treated CNTs. This is the first report so far which has not been reported in literature before. Systematic investigations were also carried out on the effect of CNTs concentration and CNTs structure on the rheological properties of silver epoxy composites. The CNT structure effects refer to as-received CNTs, nano [email protected] and acid treated CNTs, respectively. There is a clear correlation between flow-induced CNTs aggregation and steady shear viscosity of the composite. The ternary systems exhibit highest critical concentration for CNTs aggregation. Up to 7wt% of CNTs can be homogeneously dispersed inside the silver epoxy composite without any notable formation of aggregates. The highest concentration of homogenous dispersion of CNTs in literatures is less than 2 wt %.

Subjects/Keywords: Nanotubes – Carbon content ; Polymeric composites ; Rheology

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APA (6^th Edition):

Lee, L. S. (2011). Microrheology of CNT/silver epoxy composites. (Thesis). Hong Kong University of Science and Technology. Retrieved from http://repository.ust.hk/ir/Record/1783.1-7140 ; https://doi.org/10.14711/thesis-b1136745 ; http://repository.ust.hk/ir/bitstream/1783.1-7140/1/th_redirect.html

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):

Lee, Lai Sheung. “Microrheology of CNT/silver epoxy composites.” 2011. Thesis, Hong Kong University of Science and Technology. Accessed January 22, 2020. http://repository.ust.hk/ir/Record/1783.1-7140 ; https://doi.org/10.14711/thesis-b1136745 ; http://repository.ust.hk/ir/bitstream/1783.1-7140/1/th_redirect.html.

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

MLA Handbook (7^th Edition):

Lee, Lai Sheung. “Microrheology of CNT/silver epoxy composites.” 2011. Web. 22 Jan 2020.

Vancouver:

Lee LS. Microrheology of CNT/silver epoxy composites. [Internet] [Thesis]. Hong Kong University of Science and Technology; 2011. [cited 2020 Jan 22]. Available from: http://repository.ust.hk/ir/Record/1783.1-7140 ; https://doi.org/10.14711/thesis-b1136745 ; http://repository.ust.hk/ir/bitstream/1783.1-7140/1/th_redirect.html.

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

Council of Science Editors:

Lee LS. Microrheology of CNT/silver epoxy composites. [Thesis]. Hong Kong University of Science and Technology; 2011. Available from: http://repository.ust.hk/ir/Record/1783.1-7140 ; https://doi.org/10.14711/thesis-b1136745 ; http://repository.ust.hk/ir/bitstream/1783.1-7140/1/th_redirect.html

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

Hong Kong University of Science and Technology

19. Sun, Xinying. Graphene foam/polymer composites for multi-functional applications.

Degree: 2015, Hong Kong University of Science and Technology

URL: http://repository.ust.hk/ir/Record/1783.1-78795 ; https://doi.org/10.14711/thesis-b1514575 ; http://repository.ust.hk/ir/bitstream/1783.1-78795/1/th_redirect.html

► Graphene foams (GFs) with a cellular structure are prepared using the template-based chemical vapor deposition (CVD) method. They have unique properties, such as very low… (more)

▼ Graphene foams (GFs) with a cellular structure are prepared using the template-based chemical vapor deposition (CVD) method. They have unique properties, such as very low densities, excellent electrical conductivities, and high elasticity and flexibility. GF/poly(dimethyl siloxane) (PDMS) composites are prepared by infiltrating ethyl acetate solvent-diluted PDMS into the porous GFs. The unique three-dimensional (3D) interconnected porous structure of the composites with inherent percolation can find multi-functional applications in absorption of both electromagnetic and sound waves. High electrical conductivities and interconnected conductive channels are beneficial to electromagnetic interference (EMI) shielding, and efficient sound absorption requires the materials and structures to have open-cell channels so as to attenuate and dissipate wave energies. Composites with different porosities and densities are prepared to investigate their effects on EMI shielding effectiveness (SE) and low-frequency sound absorption. The GF/PDMS composites show increasing electrical conductivities and EMI SEs with increasing porosity, and the GF/PDMS composite with a 90.7% porosity has the highest electrical conductivity of 6.74 S/cm, leading to the highest EMI SE of ~25 dB in the X-band frequency of 8.2-12.4 GHz. The composite with a 51.3% porosity exhibits an exceptional absorption peak of ~0.7 at a low frequency range of 100-150 Hz. Further studies are made by incorporating well-dispersed multi-walled carbon nanotubes (MWCNTs) in the PDMS matrix to form a novel GF/CNT/PDMS electrically conductive, hybrid structure with open channels of two different scales. The hybrid composites display significant enhancements in both EMI shielding performance and low-frequency sound absorption, compared to the GF/PDMS composites. The GF/MWCNT/PDMS composite with 2 wt.% CNTs and 90.8% porosity delivers an excellent electrical conductivity of 31.5 S/cm and a remarkable EMI SE of ~75 dB, equivalent to nearly 200% increment against the GF/PDMS composite with the same porosity. There is significant synergy between GFs and CNTs in the hybrid composites: the GFs force the incident microwaves to be either reflected or attenuated through the electrically conductive, microscale channels, while the CNTs facilitate the attenuation of microwaves through the nanoscale channels by multiple scattering and interfacial electric polarization. The addition of MWCNTs also significantly improves the sound energy dissipation by friction between the CNTs and polymer matrix, leading to a commercially viable sound absorption coefficient of more than 0.3 over the low frequency range of 100-1000Hz. The microscale and nanoscale carbon channels in the composites are responsible for the better performance over 100-1000 Hz, because pores and holes with multiple sizes within the materials are beneficial for broadening the effective frequency band.

Subjects/Keywords: Graphene ; Polymeric composites ; Chemical vapor deposition

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

APA (6^th Edition):

Sun, X. (2015). Graphene foam/polymer composites for multi-functional applications. (Thesis). Hong Kong University of Science and Technology. Retrieved from http://repository.ust.hk/ir/Record/1783.1-78795 ; https://doi.org/10.14711/thesis-b1514575 ; http://repository.ust.hk/ir/bitstream/1783.1-78795/1/th_redirect.html

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):

Sun, Xinying. “Graphene foam/polymer composites for multi-functional applications.” 2015. Thesis, Hong Kong University of Science and Technology. Accessed January 22, 2020. http://repository.ust.hk/ir/Record/1783.1-78795 ; https://doi.org/10.14711/thesis-b1514575 ; http://repository.ust.hk/ir/bitstream/1783.1-78795/1/th_redirect.html.

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

MLA Handbook (7^th Edition):

Sun, Xinying. “Graphene foam/polymer composites for multi-functional applications.” 2015. Web. 22 Jan 2020.

Vancouver:

Sun X. Graphene foam/polymer composites for multi-functional applications. [Internet] [Thesis]. Hong Kong University of Science and Technology; 2015. [cited 2020 Jan 22]. Available from: http://repository.ust.hk/ir/Record/1783.1-78795 ; https://doi.org/10.14711/thesis-b1514575 ; http://repository.ust.hk/ir/bitstream/1783.1-78795/1/th_redirect.html.

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

Council of Science Editors:

Sun X. Graphene foam/polymer composites for multi-functional applications. [Thesis]. Hong Kong University of Science and Technology; 2015. Available from: http://repository.ust.hk/ir/Record/1783.1-78795 ; https://doi.org/10.14711/thesis-b1514575 ; http://repository.ust.hk/ir/bitstream/1783.1-78795/1/th_redirect.html

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

Hong Kong University of Science and Technology

20. Wu, Ying. High-permittivity graphene/polymer composites for dielectric and electromagnetic interference shielding applications.

Degree: 2017, Hong Kong University of Science and Technology

URL: http://repository.ust.hk/ir/Record/1783.1-90932 ; https://doi.org/10.14711/thesis-991012555267903412 ; http://repository.ust.hk/ir/bitstream/1783.1-90932/1/th_redirect.html

► Graphene and its derivatives have been widely applied as conductive fillers for the fabrication of high-permittivity (high-k) polymer composites. Materials with high dielectric constants and… (more)

▼ Graphene and its derivatives have been widely applied as conductive fillers for the fabrication of high-permittivity (high-k) polymer composites. Materials with high dielectric constants and low dielectric losses are extensively employed in embedded capacitors and energy storage devices, while those with high constants and high losses are promising in energy dissipation applications, such as electromagnetic interference (EMI) shielding. In this research, the full potential of graphene/polymer composites for high-k applications is explored by the chemical/physical modification of graphene, the appropriate selection of graphene structure, and the design of materials morphologies. Chlorine-doped reduced graphene oxide (rGO)/ poly (vinylidene fluoride) (PVDF) composites with exceptional dielectric constants and low loss tangents are fabricated for energy storage applications. Graphene oxide (GO) sheets are doped with chlorine by mixing thionyl chloride into the GO dispersion, resulting in the formation of both charge transfer complexes and covalently bonded chlorine on GO sheets. Ionic Cl functions as an electron acceptor, i.e. p-type dopant, and an optimal chlorination gives rise to a maximum ionic Cl, the highest charge carrier density, and the highest electrical conductivity of GO. The composites deliver an exceptional dielectric constant of 364 with a low dielectric loss of 0.077 at 1 kHz. Synergistic effects arising from chlorination are identified, including the much enhanced electrical conductivity of Cl-GO sheets by more than 3 orders of magnitude through introducing charge-transfer complexes, the improved interfacial interactions between the fillers and the PVDF matrix through hydrogen bonds, and the transformation of PVDF to β-phase with an inherently high dielectric constant due to dipolar interaction. High-k micro-sandwich composites consisting of alternating polydopamine functionalized rGO-polyurethane (PU) and boron nitride (BN) nanosheets-PU layers are developed for energy storage applications. Highly oriented rGO-PU composites are initially fabricated by freeze casting/drying, giving rise to exceptional dielectric constants with relatively high dielectric losses and low breakdown strengths. The losses are significantly suppressed while the dielectric strengths are restored after the incorporation of electrically insulating BN-PU barrier layers among the aligned rGO-PU skeleton in the second freeze casting/drying routine. The transverse ligaments connecting the conductive rGO-PU layers are effectively removed by the BN-PU barrier layers, effectively blocking current leakage in the transverse direction. The micro-sandwich composites deliver a remarkable maximum dielectric constant of 1084 with a low dielectric loss of 0.091 at 1 kHz. Taking advantage of the blocked current leakage and the incorporation of high-dielectric-strength BN-PU barrier layers, rGO-PU/BN-PU micro-sandwich composites present a much enhanced energy storage density of 22.7 J/cm³, which is 37 and 168 folds larger than those of…

Subjects/Keywords: Graphene ; Polymeric composites ; Dielectrics ; Shielding (Electricity)

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

APA (6^th Edition):

Wu, Y. (2017). High-permittivity graphene/polymer composites for dielectric and electromagnetic interference shielding applications. (Thesis). Hong Kong University of Science and Technology. Retrieved from http://repository.ust.hk/ir/Record/1783.1-90932 ; https://doi.org/10.14711/thesis-991012555267903412 ; http://repository.ust.hk/ir/bitstream/1783.1-90932/1/th_redirect.html

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):

Wu, Ying. “High-permittivity graphene/polymer composites for dielectric and electromagnetic interference shielding applications.” 2017. Thesis, Hong Kong University of Science and Technology. Accessed January 22, 2020. http://repository.ust.hk/ir/Record/1783.1-90932 ; https://doi.org/10.14711/thesis-991012555267903412 ; http://repository.ust.hk/ir/bitstream/1783.1-90932/1/th_redirect.html.

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

MLA Handbook (7^th Edition):

Wu, Ying. “High-permittivity graphene/polymer composites for dielectric and electromagnetic interference shielding applications.” 2017. Web. 22 Jan 2020.

Vancouver:

Wu Y. High-permittivity graphene/polymer composites for dielectric and electromagnetic interference shielding applications. [Internet] [Thesis]. Hong Kong University of Science and Technology; 2017. [cited 2020 Jan 22]. Available from: http://repository.ust.hk/ir/Record/1783.1-90932 ; https://doi.org/10.14711/thesis-991012555267903412 ; http://repository.ust.hk/ir/bitstream/1783.1-90932/1/th_redirect.html.

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

Council of Science Editors:

Wu Y. High-permittivity graphene/polymer composites for dielectric and electromagnetic interference shielding applications. [Thesis]. Hong Kong University of Science and Technology; 2017. Available from: http://repository.ust.hk/ir/Record/1783.1-90932 ; https://doi.org/10.14711/thesis-991012555267903412 ; http://repository.ust.hk/ir/bitstream/1783.1-90932/1/th_redirect.html

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

Hong Kong University of Science and Technology

21. Wang, Wei. Effect of matrix/particle interface on mechanical properties of polypropylene nanocomposites.

Degree: 2017, Hong Kong University of Science and Technology

URL: http://repository.ust.hk/ir/Record/1783.1-90933 ; https://doi.org/10.14711/thesis-991012558769703412 ; http://repository.ust.hk/ir/bitstream/1783.1-90933/1/th_redirect.html

► The effect of the matrix/particle interface on the mechanical properties of polypropylene (PP) nanocomposites is studied. In the present study, grafting silica nanoparticles with polypropylene… (more)

▼ The effect of the matrix/particle interface on the mechanical properties of polypropylene (PP) nanocomposites is studied. In the present study, grafting silica nanoparticles with polypropylene chains (PP-grafted silica, PGS) is proven to be a promising strategy to strengthen or weaken the interfacial binding between PP matrix and PGS. The extents of strengthening or weakening effect are correlated to the grafting chain length of PGS. When the molecular weight of a graft is above the critical molecular weight (M_c) of PP, the T_g of the PP/PGS nanocomposite shows higher than the neat PP, indicating a strong interfacial interaction, and vice versa. Entanglement interaction between the grafting chain and the matrix is considered to be the key parameter governing interfacial strength. The change in the matrix/particle interfacial strength leads to a transition in the yield stress of nanocomposites. Compared with the unfilled PP, the yield stress of the PP/PGS nanocomposites is decreased in the case of unfavorable interaction and can be enhanced in the case of a strong interaction. In addition, benefiting from good dispersion, the PP/PGS nanocomposites with a strong matrix/particle interface not only exhibit increased Young’s modulus and yield stress, but also the strain at break remains in line with the unfilled PP, which is in contrast to the conventional wisdom that the gain in modulus and strength must be at the expense of the lower break strain. Due to the weak matrix/filler interface, the great improvement in impact toughness of PP filled with stearic acid modified CaCO₃ (SA-CaCO₃) nanoparticles has been reported. In the present study, the ligament strength relating to entanglement density was proven to be one of factors to influence the toughening effect by comparing the impact strength of the PP/SA-CaCO₃ nanocomposites before and after annealing. Considering PGS can be applied to strengthen the PP ligament, a ternary nanocomposite (PP/PGS/SA-CaCO₃) with multiple matrix/particle interfaces was prepared and studied. Young’s modulus and yield stress of the ternary nanocomposites performs as expected. However, the impact strength is comparable to that of neat PP. The toughening effect of SA-CaCO₃ in the PP/ SA-CaCO₃ system is ineffective in the ternary nanocomposites, which is attributed to the following fact: Because the attraction between PGS and SA-CaCO₃ is higher than that between the PP matrix and inorganic particles, the aggregates of two different particles form, where the weak interface of CaCO₃ acts as a sharp crack, leading to an insignificant change of impact resistance.

Subjects/Keywords: Polypropylene ; Nanocomposites (Materials) ; Polymeric composites ; Mechanical properties

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

APA (6^th Edition):

Wang, W. (2017). Effect of matrix/particle interface on mechanical properties of polypropylene nanocomposites. (Thesis). Hong Kong University of Science and Technology. Retrieved from http://repository.ust.hk/ir/Record/1783.1-90933 ; https://doi.org/10.14711/thesis-991012558769703412 ; http://repository.ust.hk/ir/bitstream/1783.1-90933/1/th_redirect.html

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):

Wang, Wei. “Effect of matrix/particle interface on mechanical properties of polypropylene nanocomposites.” 2017. Thesis, Hong Kong University of Science and Technology. Accessed January 22, 2020. http://repository.ust.hk/ir/Record/1783.1-90933 ; https://doi.org/10.14711/thesis-991012558769703412 ; http://repository.ust.hk/ir/bitstream/1783.1-90933/1/th_redirect.html.

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

MLA Handbook (7^th Edition):

Wang, Wei. “Effect of matrix/particle interface on mechanical properties of polypropylene nanocomposites.” 2017. Web. 22 Jan 2020.

Vancouver:

Wang W. Effect of matrix/particle interface on mechanical properties of polypropylene nanocomposites. [Internet] [Thesis]. Hong Kong University of Science and Technology; 2017. [cited 2020 Jan 22]. Available from: http://repository.ust.hk/ir/Record/1783.1-90933 ; https://doi.org/10.14711/thesis-991012558769703412 ; http://repository.ust.hk/ir/bitstream/1783.1-90933/1/th_redirect.html.

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

Council of Science Editors:

Wang W. Effect of matrix/particle interface on mechanical properties of polypropylene nanocomposites. [Thesis]. Hong Kong University of Science and Technology; 2017. Available from: http://repository.ust.hk/ir/Record/1783.1-90933 ; https://doi.org/10.14711/thesis-991012558769703412 ; http://repository.ust.hk/ir/bitstream/1783.1-90933/1/th_redirect.html

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

Hong Kong University of Science and Technology

22. Liu, Xu. Planar graphene woven fabrics and their polymer-based composites for multifunctional applications.

Degree: 2017, Hong Kong University of Science and Technology

URL: http://repository.ust.hk/ir/Record/1783.1-90940 ; https://doi.org/10.14711/thesis-991012555666303412 ; http://repository.ust.hk/ir/bitstream/1783.1-90940/1/th_redirect.html

► Planar interconnected graphene woven fabrics (GWFs) are prepared by a directly template-based chemical vapor deposition (CVD) method on Ni woven fabric templates under optimized growth… (more)

▼ Planar interconnected graphene woven fabrics (GWFs) are prepared by a directly template-based chemical vapor deposition (CVD) method on Ni woven fabric templates under optimized growth parameters. Favourable catalytic performance of templates would be achieved after certain thermal annealing according to the increase in grain sizes and change of template crystalline structures; the number of graphene layers and the whole structure stability strongly depend on the concentrations of CH₄ and mesh densities of templates. With the exception of lightweight and high electrical conductivity, the GWF is simultaneously endowed with unique morphological features based on the continuous graphene structure. Planar porous epoxy and GWF/epoxy composites are synthesized through a simple two-step process including impregnation epoxy resin on the Ni-WF and G/Ni-WF followed by etching out the Ni template. The composites have a porous structure with continuous flexible hollow graphene tubes (GTs) orthogonal interlaced in two perpendicular dimensions, therefore, the careful dispersion, surface functionalization and the arrangement of graphene nanosheets are avoided. Because of the incorporation of GWF, the GWF/epoxy composites present excellent electrical and mechanical properties: at 0.62 wt% graphene loading, the electrical conductivity of composites increases to 0.18 S/cm; the composites give rise to ~57% and ~67% higher fracture toughness at 0° and 45° directions; the tensile strengths of the composites with those two orientations are ~12% and ~16% higher than the one of solid epoxy. The effect of different orientations of hollow GTs is specifically investigated on mechanical properties and complicated fracture behaviour of the anisotropic composites. The in situ examination of the fracture process under the microscope indicates that the intriguing fracture behaviour taking place at the crack tip is caused by the blunting effect of the hollow GTs combining with the enhancement of graphene layers. It is found that the planar GWF may find favour for emerging demanding applications for porous composites. A novel GWF/polydimethylsiloxane (PDMS) composite architecture is fabricated and works as a highly flexible and sensitive strain sensor that enables the detection of feeble human motions. Due to the distinctive functional features and reversible flexibility, the GWF/PDMS composites exhibit an extremely high piezoresistive gauge factor of 223 at a strain of 3% and excellent durability. The effects of growth condition and loading direction on their sensitivity are investigated to reveal the strain sensing mechanism. To bridge the technological gap between signal collection, processing and transmission in wearable strain sensors, a wireless wearable musical instrument prototype capable of converting human motions to music is developed for the first time by integrating the GWF/PDMS strain sensors with a smartphone via wireless Bluetooth communication. The demonstration not only offers insights into diverse applications of highly…

Subjects/Keywords: Graphene ; Polymeric composites ; Textile fabrics ; Materials

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APA (6^th Edition):

Liu, X. (2017). Planar graphene woven fabrics and their polymer-based composites for multifunctional applications. (Thesis). Hong Kong University of Science and Technology. Retrieved from http://repository.ust.hk/ir/Record/1783.1-90940 ; https://doi.org/10.14711/thesis-991012555666303412 ; http://repository.ust.hk/ir/bitstream/1783.1-90940/1/th_redirect.html

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):

Liu, Xu. “Planar graphene woven fabrics and their polymer-based composites for multifunctional applications.” 2017. Thesis, Hong Kong University of Science and Technology. Accessed January 22, 2020. http://repository.ust.hk/ir/Record/1783.1-90940 ; https://doi.org/10.14711/thesis-991012555666303412 ; http://repository.ust.hk/ir/bitstream/1783.1-90940/1/th_redirect.html.

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

MLA Handbook (7^th Edition):

Liu, Xu. “Planar graphene woven fabrics and their polymer-based composites for multifunctional applications.” 2017. Web. 22 Jan 2020.

Vancouver:

Liu X. Planar graphene woven fabrics and their polymer-based composites for multifunctional applications. [Internet] [Thesis]. Hong Kong University of Science and Technology; 2017. [cited 2020 Jan 22]. Available from: http://repository.ust.hk/ir/Record/1783.1-90940 ; https://doi.org/10.14711/thesis-991012555666303412 ; http://repository.ust.hk/ir/bitstream/1783.1-90940/1/th_redirect.html.

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

Council of Science Editors:

Liu X. Planar graphene woven fabrics and their polymer-based composites for multifunctional applications. [Thesis]. Hong Kong University of Science and Technology; 2017. Available from: http://repository.ust.hk/ir/Record/1783.1-90940 ; https://doi.org/10.14711/thesis-991012555666303412 ; http://repository.ust.hk/ir/bitstream/1783.1-90940/1/th_redirect.html

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

Hong Kong University of Science and Technology

23. Lu, Dong. Quantitative characterization of the nano-effect of halloysite nanotubes in polymer nanocomposites.

Degree: 2014, Hong Kong University of Science and Technology

URL: http://repository.ust.hk/ir/Record/1783.1-76062 ; https://doi.org/10.14711/thesis-b1266467 ; http://repository.ust.hk/ir/bitstream/1783.1-76062/1/th_redirect.html

► Nano-effect is one of the common phenomena in nanofiller reinforced polymer nanocomposites. Over the past two decades, a general hypothesis proposed by most material scientists… (more)

▼ Nano-effect is one of the common phenomena in nanofiller reinforced polymer nanocomposites. Over the past two decades, a general hypothesis proposed by most material scientists is that the nano-effect of nanofillers played a critical role in significant reinforcement of polymers. Due to the lack of proper experimental approaches and theoretical models, up to now, most trials for characterization of the nano-effect are rather qualitative. Moreover, these qualitative characterization approaches are unable to prove the existence of the nano-effect since incorporating nanofillers may also reduce the mechanical properties in some circumstances. In order to characterize the nano-effect precisely, a novel approach was invented in this study to quantitatively reveal the nano-effect of nanotube reinforced polymer nanocomposites. This approach included a series of specially designed experiments and a novel theoretical model. Both experiments and theoretical model are only controlled by the dimension of the reinforcing fiber at a certain loading and aspect ratio. Having only one variable in the experiments and theoretical model, other influencing factors which may affect the result can be fundamentally eliminated. Hence, this approach can substantially prove existence and origin of the nano-effect, and can characterize it in a quantitative way. In this study, halloysite nanotube (HNT), a typical natural nanotube, was selected as the nano-sized reinforcement due to its straight nano-structure and superior mechanical properties. And, polystyrene (PS) was chosen as the polymer matrix because of its amorphous nature and stable properties during processing. Using this approach, the nano-effect of HNTs in PS matrix was found by the experiments and numerically proven by a novel theoretical model. The huge interphase volume in the nanocomposites was characterized as the origin of the nano-effect. Furthermore, a functional relationship between Young’s modulus and radius of the reinforcing fibers at a fixed filler loading was established. Based on the results, the Young’s modulus value of the composites will be exponentially increased if the radius of the reinforcing fiber was below 200nm while it will be constant if the fiber’s radius is larger than 500nm. Hence, our theory clearly indicated that the nano-effect is only related to the dimension of the reinforcing fiber and will be triggered if its radius is under 200nm. This study enriches the fundamental knowledge of the nano-effect, which not only provides an innovative experimental approach but also presents a critical theoretical comprehension to quantitatively characterize and evaluate the nano-effect of nanofillers in polymer nanocomposites.

Subjects/Keywords: Nanocomposites (Materials) ; Polymeric composites ; Halloysite ; Nanotubes

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APA (6^th Edition):

Lu, D. (2014). Quantitative characterization of the nano-effect of halloysite nanotubes in polymer nanocomposites. (Thesis). Hong Kong University of Science and Technology. Retrieved from http://repository.ust.hk/ir/Record/1783.1-76062 ; https://doi.org/10.14711/thesis-b1266467 ; http://repository.ust.hk/ir/bitstream/1783.1-76062/1/th_redirect.html

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):

Lu, Dong. “Quantitative characterization of the nano-effect of halloysite nanotubes in polymer nanocomposites.” 2014. Thesis, Hong Kong University of Science and Technology. Accessed January 22, 2020. http://repository.ust.hk/ir/Record/1783.1-76062 ; https://doi.org/10.14711/thesis-b1266467 ; http://repository.ust.hk/ir/bitstream/1783.1-76062/1/th_redirect.html.

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

MLA Handbook (7^th Edition):

Lu, Dong. “Quantitative characterization of the nano-effect of halloysite nanotubes in polymer nanocomposites.” 2014. Web. 22 Jan 2020.

Vancouver:

Lu D. Quantitative characterization of the nano-effect of halloysite nanotubes in polymer nanocomposites. [Internet] [Thesis]. Hong Kong University of Science and Technology; 2014. [cited 2020 Jan 22]. Available from: http://repository.ust.hk/ir/Record/1783.1-76062 ; https://doi.org/10.14711/thesis-b1266467 ; http://repository.ust.hk/ir/bitstream/1783.1-76062/1/th_redirect.html.

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

Council of Science Editors:

Lu D. Quantitative characterization of the nano-effect of halloysite nanotubes in polymer nanocomposites. [Thesis]. Hong Kong University of Science and Technology; 2014. Available from: http://repository.ust.hk/ir/Record/1783.1-76062 ; https://doi.org/10.14711/thesis-b1266467 ; http://repository.ust.hk/ir/bitstream/1783.1-76062/1/th_redirect.html

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

Ryerson University

24. Hailu, Getu. Abrasive Jet Micro-Machining Of Polymeric Materials.

Degree: 2012, Ryerson University

URL: https://digital.library.ryerson.ca/islandora/object/RULA%3A1546

► In the abrasive jet micro-machining (AJM) process, a jet of small particles is directed through an erosion resistant mask opening so that micro-sized features (i.e.,… (more)

▼ In the abrasive jet micro-machining (AJM) process, a jet of small particles is directed through an erosion resistant mask opening so that micro-sized features (i.e., micro-channels, holes, etc.) can be machined for the fabrication of micro-devices such as micro-fluidic and micro-electro-mechanical-systems (MEMS). Polymeric materials and elastomers have found applications in a wide variety of micro-devices. This thesis investigates the AJM of such materials, addressing the major challenges that must be overcome in order for the process to gain wider acceptance in industry. The thesis first presents a novel cryogenically assisted abrasive jet micro-machining (CAJM) technique that enables the micro-machining of elastomers such as polydimethylsiloxane (PDMS) that cannot be machined at room temperature. It was found that the erosion rate during CAJM is greatly increased, and the degree of particle embedment greatly decreased, compared to room temperature experiments. A finite element (FE) analysis was used to investigate the relationships between erosion, the heat transfer of the cooling jet and the resulting target temperature during the CAJM of channels in PDMS. The analysis illustrated the asymmetric nature of the cooling with much more cooling occurring towards the trailing edge of the jet. It was found that the predicted shape of the evolving machined surface profiles was improved significantly when a FE model was used to account for thermal distortion occurring during the CAJM process.An unwanted consequence of the AJM of polymeric materials was found to be particle embedding. Criteria leading to the embedding of spherical and angular particles in such materials were identified and modelled using rigid plastic analyses. It was found that the likelihood of embedding was proportional to the static coefficient of friction between the particle and the target for angular particles, and the depth of penetration for spherical particles.Scanning electron microscopy with EDX was used to measure the area coverage of embedded Al2O3 particles in polymers and elastomers, in order to evaluate various cleaning methods that were developed. It was found that glass bead blasting at 45˚ followed by the freezing technique was the best method to remove embedded particles, leading to 100% removal in some cases.

Subjects/Keywords: Micromachining – Mathematical models; Polymeric composites – Surfaces – Mathematical models; Polymeric composites – Erosion – Mathematical models

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APA (6^th Edition):

Hailu, G. (2012). Abrasive Jet Micro-Machining Of Polymeric Materials. (Thesis). Ryerson University. Retrieved from https://digital.library.ryerson.ca/islandora/object/RULA%3A1546

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):

Hailu, Getu. “Abrasive Jet Micro-Machining Of Polymeric Materials.” 2012. Thesis, Ryerson University. Accessed January 22, 2020. https://digital.library.ryerson.ca/islandora/object/RULA%3A1546.

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

MLA Handbook (7^th Edition):

Hailu, Getu. “Abrasive Jet Micro-Machining Of Polymeric Materials.” 2012. Web. 22 Jan 2020.

Vancouver:

Hailu G. Abrasive Jet Micro-Machining Of Polymeric Materials. [Internet] [Thesis]. Ryerson University; 2012. [cited 2020 Jan 22]. Available from: https://digital.library.ryerson.ca/islandora/object/RULA%3A1546.

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

Council of Science Editors:

Hailu G. Abrasive Jet Micro-Machining Of Polymeric Materials. [Thesis]. Ryerson University; 2012. Available from: https://digital.library.ryerson.ca/islandora/object/RULA%3A1546

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

Durban University of Technology

25. Gilpin, Mark. Material characterisation for the modelling of the vacuum infusion process.

Degree: 2015, Durban University of Technology

URL: http://hdl.handle.net/10321/1724

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Submitted in fulfillment of the requirements for the degree of Doctor of Engineering: Mechanical Engineering, Durban University of Technology, Durban, South Africa, 2015.

Vacuum Infusion… (more)

▼

Submitted in fulfillment of the requirements for the degree of Doctor of Engineering: Mechanical Engineering, Durban University of Technology, Durban, South Africa, 2015.

Vacuum Infusion (VI) and Resin Transfer Moulding (RTM) are liquid composite moulding processes used in the manufacture of components from composite materials. The composite material in this case consists of a resin matrix combined with fibre reinforcement. In both moulding processes, a dry reinforcement preform is placed in the mould cavity and a liquid resin is introduced, driven by a pressure differential. Two rigid surfaces are used in RTM to create a fixed mould cavity. In contrast VI implements only one rigid surface and a flexible membrane or vacuum bag to form a non rigid cavity. The flexible cavity in VI influences and differentiates resin flow behaviour from that of RTM. Modelling resin flow enables the velocity, pressure and flow direction to be predicted. Resin flow in the RTM process is understood and modelled using Darcy’s law. However, flow in the VI process is not accurately modelled due to the added complexity introduced as a result of the flexible cavity. In the present work a novel approach was developed to investigate fluid flow in both processes. A unique experimental setup and testing procedure allowed for the direct comparison of fluid flow in RTM and VI. Identical flow parameters, conditions and preform construction were used in the assessment. The comparison isolated the effect of preform thickness variation as a differentiating factor influencing flow. From the experimentation, material behaviour was characterised and used to evaluate flow models for RTM and in particular VI. The model solutions were compared back to corresponding experiments. The pressure distribution behind the flow front, fill time and thickness behaviours were assessed. The pressure distribution / profiles behind the flow front of both VI and RTM were noted to be scalable with flow front progression. The profiles were curved in the VI experiments and linear in the RTM case. All VI models evaluated including the non accumulation based model accurately predicted the pressure distribution and consequently thickness variations in the VI tests. Fill times of the VI experiments were longer than that of the equivalent RTM tests. This behaviour is in contrast to previously interpreted fill time behaviour for the VI process based on VI models. It was also noted that the VI fill times were not only proportional to the square of the fill length, as in the RTM case, but also proportional to the square of the mass present. In addition, no significant accumulation was noted in the VI experiments.

D

Advisors/Committee Members: Jonson, Jon David.

Subjects/Keywords: Composite materials; Molding (Chemical technology); Polymeric composites; Fibrous composites

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APA (6^th Edition):

Gilpin, M. (2015). Material characterisation for the modelling of the vacuum infusion process. (Thesis). Durban University of Technology. Retrieved from http://hdl.handle.net/10321/1724

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):

Gilpin, Mark. “Material characterisation for the modelling of the vacuum infusion process.” 2015. Thesis, Durban University of Technology. Accessed January 22, 2020. http://hdl.handle.net/10321/1724.

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

MLA Handbook (7^th Edition):

Gilpin, Mark. “Material characterisation for the modelling of the vacuum infusion process.” 2015. Web. 22 Jan 2020.

Vancouver:

Gilpin M. Material characterisation for the modelling of the vacuum infusion process. [Internet] [Thesis]. Durban University of Technology; 2015. [cited 2020 Jan 22]. Available from: http://hdl.handle.net/10321/1724.

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

Council of Science Editors:

Gilpin M. Material characterisation for the modelling of the vacuum infusion process. [Thesis]. Durban University of Technology; 2015. Available from: http://hdl.handle.net/10321/1724

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

University of Hong Kong

26. 伍寶琼; Ng, Po-king. Molecular and polymeric metal complexes for electroluminescence applications.

Degree: PhD, 1999, University of Hong Kong

URL: Ng, P. [伍寶琼]. (1999). Molecular and polymeric metal complexes for electroluminescence applications. (Thesis). University of Hong Kong, Pokfulam, Hong Kong SAR. Retrieved from http://dx.doi.org/10.5353/th_b2986630 ; http://dx.doi.org/10.5353/th_b2986630 ; http://hdl.handle.net/10722/31985

toc

abstract

published_or_final_version

Chemistry

Doctoral

Doctor of Philosophy

Subjects/Keywords: Electroluminescence.; Polymeric composites.; Metallic composites.

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APA (6^th Edition):

伍寶琼; Ng, P. (1999). Molecular and polymeric metal complexes for electroluminescence applications. (Doctoral Dissertation). University of Hong Kong. Retrieved from Ng, P. [伍寶琼]. (1999). Molecular and polymeric metal complexes for electroluminescence applications. (Thesis). University of Hong Kong, Pokfulam, Hong Kong SAR. Retrieved from http://dx.doi.org/10.5353/th_b2986630 ; http://dx.doi.org/10.5353/th_b2986630 ; http://hdl.handle.net/10722/31985

Chicago Manual of Style (16^th Edition):

伍寶琼; Ng, Po-king. “Molecular and polymeric metal complexes for electroluminescence applications.” 1999. Doctoral Dissertation, University of Hong Kong. Accessed January 22, 2020. Ng, P. [伍寶琼]. (1999). Molecular and polymeric metal complexes for electroluminescence applications. (Thesis). University of Hong Kong, Pokfulam, Hong Kong SAR. Retrieved from http://dx.doi.org/10.5353/th_b2986630 ; http://dx.doi.org/10.5353/th_b2986630 ; http://hdl.handle.net/10722/31985.

MLA Handbook (7^th Edition):

伍寶琼; Ng, Po-king. “Molecular and polymeric metal complexes for electroluminescence applications.” 1999. Web. 22 Jan 2020.

Vancouver:

伍寶琼; Ng P. Molecular and polymeric metal complexes for electroluminescence applications. [Internet] [Doctoral dissertation]. University of Hong Kong; 1999. [cited 2020 Jan 22]. Available from: Ng, P. [伍寶琼]. (1999). Molecular and polymeric metal complexes for electroluminescence applications. (Thesis). University of Hong Kong, Pokfulam, Hong Kong SAR. Retrieved from http://dx.doi.org/10.5353/th_b2986630 ; http://dx.doi.org/10.5353/th_b2986630 ; http://hdl.handle.net/10722/31985.

Council of Science Editors:

伍寶琼; Ng P. Molecular and polymeric metal complexes for electroluminescence applications. [Doctoral Dissertation]. University of Hong Kong; 1999. Available from: Ng, P. [伍寶琼]. (1999). Molecular and polymeric metal complexes for electroluminescence applications. (Thesis). University of Hong Kong, Pokfulam, Hong Kong SAR. Retrieved from http://dx.doi.org/10.5353/th_b2986630 ; http://dx.doi.org/10.5353/th_b2986630 ; http://hdl.handle.net/10722/31985

27. Chizyuka, Gungubwe Chizyuka. Modelling environmental effects on fracture damage of natural fibre-reinforced polymer composites.

Degree: 2016, University of Zimbabwe

URL: http://dspace.unza.zm/handle/123456789/4767

► The behaviour of sodium hydroxide treated sisal fibre-reinforced polyester composite subjected to environmental ageing conditions has been studied with the aim of modelling its effect… (more)

▼ The behaviour of sodium hydroxide treated sisal fibre-reinforced polyester composite subjected to environmental ageing conditions has been studied with the aim of modelling its effect on the composite fracture damage for the purpose of long-term performance prediction. The composite was accelerated aged by hydrothermal ageing by immersing test specimens in distilled water at respective temperatures of 23 °C, 40 °C and 60 °C for a maximum period of 6 months. At regular intervals tests were conducted to assess the retention of the mechanical properties. Tests conducted included tensile tests on single sisal fibres, neat cured polyester resin, and sisal fibre reinforced polyester composite test specimens. Retention of fracture strength of the composite was further assessed both at macro and micro levels. The assessment of the fracture toughness properties was conducted on eccentrically loaded in tension single-edge-notch (ESE(T)) specimens; whereas fibre/matrix interfacial shear strength was assessed through the single fibre microbond method. Viscoelastic properties of matrix material which include storage modulus, loss modulus, and glass transition temperature were further determined and monitored using the Dynamic Mechanical Analysis (DMA) method. All tests conducted included test of non-hydrothermally treated test specimens for the purpose of setting a comparative baseline and determining the effect the ageing process poses on the composite properties. Results from the single fibre microbond tests revealed significant reductions in the interfacial microbond strengths as the absorbed moisture levels intensified. Results from fractographic differences in the Scanned Electron Microscopic (SEM) images of the fractured microbond test specimens indicate little to no traces of the residual matrix material present on the sisal fibre at the original location of the polyester resin droplet along the fibre. This brings out a possible conclusion that fibre debonding is an established fracture mechanism in hydrothermally aged sisal fibre reinforced composite systems. The presence of this residual matrix appears to be dependent on the duration of the applied hydrothermal ageing.

Subjects/Keywords: Fibrous Composites; Polymeric Composites; Reinforced Plastics; Plant Fibres; Materials Research

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APA (6^th Edition):

Chizyuka, G. C. (2016). Modelling environmental effects on fracture damage of natural fibre-reinforced polymer composites. (Thesis). University of Zimbabwe. Retrieved from http://dspace.unza.zm/handle/123456789/4767

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):

Chizyuka, Gungubwe Chizyuka. “Modelling environmental effects on fracture damage of natural fibre-reinforced polymer composites.” 2016. Thesis, University of Zimbabwe. Accessed January 22, 2020. http://dspace.unza.zm/handle/123456789/4767.

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

MLA Handbook (7^th Edition):

Chizyuka, Gungubwe Chizyuka. “Modelling environmental effects on fracture damage of natural fibre-reinforced polymer composites.” 2016. Web. 22 Jan 2020.

Vancouver:

Chizyuka GC. Modelling environmental effects on fracture damage of natural fibre-reinforced polymer composites. [Internet] [Thesis]. University of Zimbabwe; 2016. [cited 2020 Jan 22]. Available from: http://dspace.unza.zm/handle/123456789/4767.

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

Council of Science Editors:

Chizyuka GC. Modelling environmental effects on fracture damage of natural fibre-reinforced polymer composites. [Thesis]. University of Zimbabwe; 2016. Available from: http://dspace.unza.zm/handle/123456789/4767

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

Texas A&M University

28. Zhuang, Linqi. Failure Mechanisms in Unidirectional Composites Under Transverse and Longitudinal Tension.

Degree: PhD, Aerospace Engineering, 2018, Texas A&M University

URL: http://hdl.handle.net/1969.1/173375

► This dissertation deals with analysis of failure mechanisms in unidirectional reinforced fiber composites under axial and transverse tensile loads. These two failure modes are fundamental… (more)

▼ This dissertation deals with analysis of failure mechanisms in unidirectional reinforced fiber composites under axial and transverse tensile loads. These two failure modes are fundamental in governing the performance of composite materials in most applications. In spite of many years of research in the mechanisms underlying these failure modes, gaps in their understanding have remained. This dissertation attempts to fill those gaps. Two particular issues are addressed in the studies conducted here: 1) under transverse tension, what is the process by which fiber/matrix debond cracks link up to form transverse cracks, and 2) under longitudinal tension, how does a fracture plane form? In the study, related to transverse tension, plausible mechanisms for transverse crack formation are considered in two scenarios: Scenario 1 where a pre-existing single fiber/matrix debond crack kinks out into the matrix and induces fiber/matrix debonding at neighboring fibers, and Scenario 2 where multiple pre-existing debond cracks link up by the debond growth and crack kink-out process. A 2-D finite element model consisting of a circular region of matrix with a central fiber surrounded by six fibers in a hexagonal pattern is used for the local stress analysis. The region is embedded in a homogenized unidirectional composite of rectangular outer boundary. Energy release rates (ERRs) of interface cracks and kinked-out cracks are calculated under applied tension normal to fibers. Results show that Scenario 2 is more likely to lead to formation of a transverse crack than Scenario 1. The study related to longitudinal tension considers a broken fiber as the nucleation site for formation of a plane whose unstable growth leads to failure. To analyze the conditions for formation of this “critical fracture plane”, an axisymmetrical finite element model is constructed with the broken fiber at the center surrounded by intact fibers. Here, too, two scenarios are considered: one, where the broken fiber results from the manufacturing process, and two, where a fiber fails at a weak point under loading. In the first case, a matrix crack is found to initiate from the broken fiber end and grow normal to the fiber axis, while in the second case, a matrix crack kinks out of an assumed short fiber/matrix debond crack and grows out toward the neighboring fibers. The studies conducted here provide valuable input into multiscale approaches that link the local failure to global response of composite structures. Advisors/Committee Members: Talreja, Ramesh (advisor), Kinra, Vikram (committee member), Reddy, J.N. (committee member), Muliana, Anastasia (committee member).

Subjects/Keywords: Polymeric Composites; Failures of Composites; Finite Element Analysis

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APA (6^th Edition):

Zhuang, L. (2018). Failure Mechanisms in Unidirectional Composites Under Transverse and Longitudinal Tension. (Doctoral Dissertation). Texas A&M University. Retrieved from http://hdl.handle.net/1969.1/173375

Chicago Manual of Style (16^th Edition):

Zhuang, Linqi. “Failure Mechanisms in Unidirectional Composites Under Transverse and Longitudinal Tension.” 2018. Doctoral Dissertation, Texas A&M University. Accessed January 22, 2020. http://hdl.handle.net/1969.1/173375.

MLA Handbook (7^th Edition):

Zhuang, Linqi. “Failure Mechanisms in Unidirectional Composites Under Transverse and Longitudinal Tension.” 2018. Web. 22 Jan 2020.

Vancouver:

Zhuang L. Failure Mechanisms in Unidirectional Composites Under Transverse and Longitudinal Tension. [Internet] [Doctoral dissertation]. Texas A&M University; 2018. [cited 2020 Jan 22]. Available from: http://hdl.handle.net/1969.1/173375.

Council of Science Editors:

Zhuang L. Failure Mechanisms in Unidirectional Composites Under Transverse and Longitudinal Tension. [Doctoral Dissertation]. Texas A&M University; 2018. Available from: http://hdl.handle.net/1969.1/173375

Michigan State University

29. Wu, Jun. Shape and laminate optimization of fiber-reinforced-polymer structures.

Degree: PhD, Department of Civil and Environment Engineering, 2004, Michigan State University

URL: http://etd.lib.msu.edu/islandora/object/etd:32435

Subjects/Keywords: Polymeric composites; Fibrous composites

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

APA (6^th Edition):

Wu, J. (2004). Shape and laminate optimization of fiber-reinforced-polymer structures. (Doctoral Dissertation). Michigan State University. Retrieved from http://etd.lib.msu.edu/islandora/object/etd:32435

Chicago Manual of Style (16^th Edition):

Wu, Jun. “Shape and laminate optimization of fiber-reinforced-polymer structures.” 2004. Doctoral Dissertation, Michigan State University. Accessed January 22, 2020. http://etd.lib.msu.edu/islandora/object/etd:32435.

MLA Handbook (7^th Edition):

Wu, Jun. “Shape and laminate optimization of fiber-reinforced-polymer structures.” 2004. Web. 22 Jan 2020.

Vancouver:

Wu J. Shape and laminate optimization of fiber-reinforced-polymer structures. [Internet] [Doctoral dissertation]. Michigan State University; 2004. [cited 2020 Jan 22]. Available from: http://etd.lib.msu.edu/islandora/object/etd:32435.

Council of Science Editors:

Wu J. Shape and laminate optimization of fiber-reinforced-polymer structures. [Doctoral Dissertation]. Michigan State University; 2004. Available from: http://etd.lib.msu.edu/islandora/object/etd:32435

Michigan State University

30. Vyakarnam, Murty N. (Murty Narayan). Development of a high speed powder process to manufacture composite prepeg.

Degree: MS, Department of Chemical Engineering, 1992, Michigan State University

URL: http://etd.lib.msu.edu/islandora/object/etd:29983

Subjects/Keywords: Fibrous composites; Polymeric composites

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APA (6^th Edition):

Vyakarnam, M. N. (. N. (1992). Development of a high speed powder process to manufacture composite prepeg. (Masters Thesis). Michigan State University. Retrieved from http://etd.lib.msu.edu/islandora/object/etd:29983

Chicago Manual of Style (16^th Edition):

Vyakarnam, Murty N (Murty Narayan). “Development of a high speed powder process to manufacture composite prepeg.” 1992. Masters Thesis, Michigan State University. Accessed January 22, 2020. http://etd.lib.msu.edu/islandora/object/etd:29983.

MLA Handbook (7^th Edition):

Vyakarnam, Murty N (Murty Narayan). “Development of a high speed powder process to manufacture composite prepeg.” 1992. Web. 22 Jan 2020.

Vancouver:

Vyakarnam MN(N. Development of a high speed powder process to manufacture composite prepeg. [Internet] [Masters thesis]. Michigan State University; 1992. [cited 2020 Jan 22]. Available from: http://etd.lib.msu.edu/islandora/object/etd:29983.

Council of Science Editors:

Vyakarnam MN(N. Development of a high speed powder process to manufacture composite prepeg. [Masters Thesis]. Michigan State University; 1992. Available from: http://etd.lib.msu.edu/islandora/object/etd:29983

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Open Access Theses and Dissertations