subject:(Polyvinyl alcohol)

University of Manchester

1. Mollasalehi, Somayeh. Fungal biodegradation of polyvinyl alcohol in soil and compost environments.

Degree: PhD, 2013, University of Manchester

URL: https://www.research.manchester.ac.uk/portal/en/theses/fungal-biodegradation-of-polyvinyl-alcohol-in-soil-and-compost-environments(83f0d3a8-c24a-400b-b297-57d165fbd97c).html ; http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.588131

► For over 50 years, synthetic petrochemical-based plastics have been produced in ever growing volumes globally and since their first commercial introduction; they have been continually… (more)

▼ For over 50 years, synthetic petrochemical-based plastics have been produced in ever growing volumes globally and since their first commercial introduction; they have been continually developed with regards to quality, colour, durability, and resistance. With some exceptions, such as polyurethanes, most plastics are very stable and are not readily degraded when they enter the ground as waste, taking decades to biodegrade and therefore are major pollutants of terrestrial and marine ecosystems. During the last thirty years, extensive research has been conducted to develop biodegradable plastics as more environmentally benign alternatives to traditional plastic polymers. Polyvinyl alcohol (PVA) is a water-soluble polymer which has recently attracted interest for the manufacture of biodegradable plastic materials. PVA is widely used as a paper coating, in adhesives and films, as a finishing agent in the textile industries and in forming oxygen impermeable films. Consequently, waste-water can contain a considerable amount of PVA and can contaminate the wider environment where the rate of biodegradation is slow. Despite its growing use, relatively little is known about its degradation and in particular the role of fungi in this process. In this study, a number of fungal strains capable of degrading PVA from uncontaminated soil from eight different sites were isolated by enrichment in mineral salts medium containing PVA as a sole carbon source and subsequently identified by sequencing the ITS and 5.8S rDNA region. The most frequently isolated fungal strains were identified as Galactomyces geotrichum, Trichosporon laibachii, Fimetariella rabenhorsti and Fusarium oxysporum. G. geotrichum was shown to grow and utilise PVA as the sole carbon source with a mean doubling time of ca. 6-7 h and was similar on PVA with molecular weight ranges of 13-23 KDa, 30-50 KDa and 85-124 KDa. When solid PVA films were buried in compost, Galactomyces geotrichum was also found to be the principal colonizing fungus at 25°C, whereas at 45°C and 55°C, the principle species recovered was the thermophile Talaromyces emersonii. ESEM revealed that the surface of the PVA films were heavily covered with fungal mycelia and DGGE analysis of the surface mycelium confirmed that the fungi recovered from the surface of the PVA film constituted the majority of the colonising fungi. When PVA was added to soil at 25°C, and in compost at 25°C and 45°C, terminal restriction fragment length polymorphism (T-RFLP) revealed that the fungal community rapidly changed over two weeks with the appearance of novel species, presumably due to selection for degraders, but returned to a population that was similar to the starting population within six weeks, indicating that PVA contamination causes a temporary shift in the fungal community.

Subjects/Keywords: 620.1; fungal biodegradation; biodeterioration; biodegradation; biodegradation of polyvinyl alcohol; polyvinyl alcohol

Record Details Similar Records Cite « Share

❌

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

APA (6^th Edition):

Mollasalehi, S. (2013). Fungal biodegradation of polyvinyl alcohol in soil and compost environments. (Doctoral Dissertation). University of Manchester. Retrieved from https://www.research.manchester.ac.uk/portal/en/theses/fungal-biodegradation-of-polyvinyl-alcohol-in-soil-and-compost-environments(83f0d3a8-c24a-400b-b297-57d165fbd97c).html ; http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.588131

Chicago Manual of Style (16^th Edition):

Mollasalehi, Somayeh. “Fungal biodegradation of polyvinyl alcohol in soil and compost environments.” 2013. Doctoral Dissertation, University of Manchester. Accessed January 15, 2021. https://www.research.manchester.ac.uk/portal/en/theses/fungal-biodegradation-of-polyvinyl-alcohol-in-soil-and-compost-environments(83f0d3a8-c24a-400b-b297-57d165fbd97c).html ; http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.588131.

MLA Handbook (7^th Edition):

Mollasalehi, Somayeh. “Fungal biodegradation of polyvinyl alcohol in soil and compost environments.” 2013. Web. 15 Jan 2021.

Vancouver:

Mollasalehi S. Fungal biodegradation of polyvinyl alcohol in soil and compost environments. [Internet] [Doctoral dissertation]. University of Manchester; 2013. [cited 2021 Jan 15]. Available from: https://www.research.manchester.ac.uk/portal/en/theses/fungal-biodegradation-of-polyvinyl-alcohol-in-soil-and-compost-environments(83f0d3a8-c24a-400b-b297-57d165fbd97c).html ; http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.588131.

Council of Science Editors:

Mollasalehi S. Fungal biodegradation of polyvinyl alcohol in soil and compost environments. [Doctoral Dissertation]. University of Manchester; 2013. Available from: https://www.research.manchester.ac.uk/portal/en/theses/fungal-biodegradation-of-polyvinyl-alcohol-in-soil-and-compost-environments(83f0d3a8-c24a-400b-b297-57d165fbd97c).html ; http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.588131

Deakin University

2. Li, Chengpeng. Synergistic reinforcement, crystallization and degradation of PVA-graphene-clay composites.

Degree: 2014, Deakin University

URL: http://hdl.handle.net/10536/DRO/DU:30067379

► Initially, synergistic reinforcement PVA composite has been successfully developed by using graphene and MMT. Furthermore, new knowledge of the crystallization mechanism of the PVA and… (more)

Subjects/Keywords: polyvinyl alcohol (PVA); montmorillonite (MMT); PVA composites

Record Details Similar Records Cite « Share

❌

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

APA (6^th Edition):

Li, C. (2014). Synergistic reinforcement, crystallization and degradation of PVA-graphene-clay composites. (Thesis). Deakin University. Retrieved from http://hdl.handle.net/10536/DRO/DU:30067379

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):

Li, Chengpeng. “Synergistic reinforcement, crystallization and degradation of PVA-graphene-clay composites.” 2014. Thesis, Deakin University. Accessed January 15, 2021. http://hdl.handle.net/10536/DRO/DU:30067379.

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

MLA Handbook (7^th Edition):

Li, Chengpeng. “Synergistic reinforcement, crystallization and degradation of PVA-graphene-clay composites.” 2014. Web. 15 Jan 2021.

Vancouver:

Li C. Synergistic reinforcement, crystallization and degradation of PVA-graphene-clay composites. [Internet] [Thesis]. Deakin University; 2014. [cited 2021 Jan 15]. Available from: http://hdl.handle.net/10536/DRO/DU:30067379.

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

Council of Science Editors:

Li C. Synergistic reinforcement, crystallization and degradation of PVA-graphene-clay composites. [Thesis]. Deakin University; 2014. Available from: http://hdl.handle.net/10536/DRO/DU:30067379

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

Univerzitet u Beogradu

3. Lević, Steva M., 1981-. Inkapsulacija aroma u karnauba vosku, alginatu i polivinil-alkoholu.

Degree: Poljoprivredni fakultet, 2016, Univerzitet u Beogradu

URL: https://fedorabg.bg.ac.rs/fedora/get/o:11100/bdef:Content/get

►

Biotehničke nauke - Nauka o konzervisanju / Biotechnical sciences - The science of food preservation

U ovoj disertaciji je ispitivana inkapsulacija prehrambenih aroma uz primenu… (more)

▼

Biotehničke nauke - Nauka o konzervisanju / Biotechnical sciences - The science of food preservation

U ovoj disertaciji je ispitivana inkapsulacija prehrambenih aroma uz primenu različitih metoda inkapsulacije i u kombinaciji sa prirodnim i sintetičkim nosačima. Cilj istraživanja je bio dobijanje inkapsulata kako tečnih tako i čvrstih aroma koje se najčešće koriste u prehrambenoj industriji. Ispitivana su tri nosača za inkapsulaciju aroma: karnauba vosak, alginat i polivinil alkohol. Kao model arome su korišćene: etil vanilin, komercijalno dostupna aroma kokosa i D-limonen. Karnauba vosak je korišćen kao nosač za inkapsulaciju etil vanilina, pri čemu su dobijene sferne čestice čiji je prečnik uglavnom bio ispod 250μm. Čestice na bazi karnauba voska sa etil vanilinom su dobijene primenom disperzione (emulzifikacione) metode i disperzione tehnike (disperzija komprimovanim vazduhom). Metodom disperzije vazduhom su dobijene čestice pravilnijeg sfernog oblika sa većom inkapsulacionom efikasnošću. Takođe, termička svojstva inkapsulisanog etil vanilina su poboljšana u poređenju sa slobodnom aromom. Termičko otpuštanje inkapsulisanog etil vanilina se odigravalo na višim temperaturama (do~270°C) u poređenju sa slobonom aromom (do ~220°C). Ca-alginatne čestice sa tečnim i čvrstim aromama su dobijane metodom elektrostatičke ekstruzije. Inkapsulacijom etil vanilina u Ca-alginatni matriks su ostvarena bolja termička svojstva inkapsulisane arome uz postizanje kontrolisanog termičkog otpuštanja arome u širem temperaturnom opsegu u odnosu na slobodnu aromu. Aroma kokosa i D-limonen su inkapsulisani u Ca-alginatne čestice primenom iste procedure kao i u slučaju inkapsulacije etil vanilina. Alginat je pokazao dobra emulgujuća svojstva, što je osnovni uslov za postizanje visoke inkapsulacione efikasnosti. Rezultati termičke analize su pokazali da obe arome u inkapsulisanom obliku imaju bolja termička svojstva u odnosu na slobodne arome. Rehidracija je korišćena za ispitivanje adsorpcije vode u inkapsulate uz razvoj novog modela rehidracije. Polivinil alkohol je u kombinaciji sa alginatom korišćen za dobijanje čestica sa inkapsulisanim etil vanilinom metodom elektrostatičke ekstruzije. Primenom viših napona kod metode elektrostatičke ekstruzije-elektrospininga dobijeni su filmovi na bazi polivinil alkohola koji se sastoje od nanovlakana. Filmovi na bazi polivinil alkohola su pokazali dobra hemijska, mehanička, termička i antimikrobna svojstva...

Advisors/Committee Members: Nedović, Viktor, 1964-.

Subjects/Keywords: encapsulation; carnauba wax; alginate; polyvinyl alcohol; flavours

Record Details Similar Records Cite « Share

❌

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

APA (6^th Edition):

Lević, Steva M., 1. (2016). Inkapsulacija aroma u karnauba vosku, alginatu i polivinil-alkoholu. (Thesis). Univerzitet u Beogradu. Retrieved from https://fedorabg.bg.ac.rs/fedora/get/o:11100/bdef:Content/get

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):

Lević, Steva M., 1981-. “Inkapsulacija aroma u karnauba vosku, alginatu i polivinil-alkoholu.” 2016. Thesis, Univerzitet u Beogradu. Accessed January 15, 2021. https://fedorabg.bg.ac.rs/fedora/get/o:11100/bdef:Content/get.

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

MLA Handbook (7^th Edition):

Lević, Steva M., 1981-. “Inkapsulacija aroma u karnauba vosku, alginatu i polivinil-alkoholu.” 2016. Web. 15 Jan 2021.

Vancouver:

Lević, Steva M. 1. Inkapsulacija aroma u karnauba vosku, alginatu i polivinil-alkoholu. [Internet] [Thesis]. Univerzitet u Beogradu; 2016. [cited 2021 Jan 15]. Available from: https://fedorabg.bg.ac.rs/fedora/get/o:11100/bdef:Content/get.

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

Council of Science Editors:

Lević, Steva M. 1. Inkapsulacija aroma u karnauba vosku, alginatu i polivinil-alkoholu. [Thesis]. Univerzitet u Beogradu; 2016. Available from: https://fedorabg.bg.ac.rs/fedora/get/o:11100/bdef:Content/get

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

4. Atlan, Michaël. Implantation et évaluation de micro-implants vasculaires (< 2mm), à base d’alcool polyvinylique : Non communiqué.

Degree: Docteur es, Sciences de l'ingénieur mention Génie biologique et médical, 2016, Sorbonne Paris Cité

URL: http://www.theses.fr/2016USPCD035

►

Sur la base de précédents travaux de l’unité INSERM 1148, sur des films à base d’alcool polyvinylique, nous avons implanté et évalué des prothèses de… (more)

Subjects/Keywords: Alcool polyvinylique (PVA); Polyvinyl alcohol (PVA)

Record Details Similar Records Cite « Share

❌

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

APA (6^th Edition):

Atlan, M. (2016). Implantation et évaluation de micro-implants vasculaires (< 2mm), à base d’alcool polyvinylique : Non communiqué. (Doctoral Dissertation). Sorbonne Paris Cité. Retrieved from http://www.theses.fr/2016USPCD035

Chicago Manual of Style (16^th Edition):

Atlan, Michaël. “Implantation et évaluation de micro-implants vasculaires (< 2mm), à base d’alcool polyvinylique : Non communiqué.” 2016. Doctoral Dissertation, Sorbonne Paris Cité. Accessed January 15, 2021. http://www.theses.fr/2016USPCD035.

MLA Handbook (7^th Edition):

Atlan, Michaël. “Implantation et évaluation de micro-implants vasculaires (< 2mm), à base d’alcool polyvinylique : Non communiqué.” 2016. Web. 15 Jan 2021.

Vancouver:

Atlan M. Implantation et évaluation de micro-implants vasculaires (< 2mm), à base d’alcool polyvinylique : Non communiqué. [Internet] [Doctoral dissertation]. Sorbonne Paris Cité; 2016. [cited 2021 Jan 15]. Available from: http://www.theses.fr/2016USPCD035.

Council of Science Editors:

Atlan M. Implantation et évaluation de micro-implants vasculaires (< 2mm), à base d’alcool polyvinylique : Non communiqué. [Doctoral Dissertation]. Sorbonne Paris Cité; 2016. Available from: http://www.theses.fr/2016USPCD035

University of New South Wales

5. Nguyen, Duong Dinh. Effects of cellulose ether and polyvinyl alcohol on hydration and rheology of cementitious tile adhesives.

Degree: Materials Science & Engineering, 2015, University of New South Wales

URL: http://handle.unsw.edu.au/1959.4/54553 ; https://unsworks.unsw.edu.au/fapi/datastream/unsworks:35293/SOURCE02?view=true

► The present work aims to provide a fundamental understanding of the effects of cellulose ether (CE) and polyvinyl alcohol (PVA) additions on the hydration and… (more)

▼ The present work aims to provide a fundamental understanding of the effects of cellulose ether (CE) and polyvinyl alcohol (PVA) additions on the hydration and rheology of cementitious tile adhesives (CTAs). The first part of the thesis focusses on cement hydration and involves the following three stages.Stage 1: PVAs undergo hydrolysis in wet cement to release acetate groups into pore water solution. This stage, which focussed on the effects of these acetate groups on early cement hydration through the addition of the analogue acetic acid, showed that acetate addition had a mixed effect; the effect was enhanced with increasing acetic acid concentration up to the point at which surface adsorption of acetate reached the saturation level.Stages 2 and 3: Stage 2 focussed on the effects of the degree of hydrolysis (DH) and the degree of polymerisation (DP) of PVA on the kinetics of hydration of Portland cement pastes that were modified by polyvinyl alcohol (PVA) addition. Stage 3 focussed on the effects of the same factors on the kinetics of hydration of Portland cement pastes modified using a mixture of CE and individual PVAs. This work was able to produce a detailed model describing the effects of these factors on the heats of hydration of cement pastes during the first 24 h. Further, the impacts of the DH and DP of PVA on the kinetics of the hydration of C3S were assessed through measurement of the calcium hydroxide contents of cement pastes aged for 24 h.The second part of the thesis focusses on the rheology and involves the following two stages.Stage 1: This stage examined the impact of PVA on the rheology of Portland cement pastes as a function of the content and molecular weight (Mw). The addition of PVA increased the yield stress, shear stress, and viscosity of the cement pastes; these effects were enhanced with increasing contents and Mw of PVA. Advisors/Committee Members: Sorrell, Charles, Materials Science & Engineering, Faculty of Science, UNSW, Koshy, Pramod, Materials Science & Engineering, Faculty of Science, UNSW.

Subjects/Keywords: Cementitious tile adhesive; Cellulose ether; Polyvinyl alcohol

Record Details Similar Records Cite « Share

❌

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

APA (6^th Edition):

Nguyen, D. D. (2015). Effects of cellulose ether and polyvinyl alcohol on hydration and rheology of cementitious tile adhesives. (Doctoral Dissertation). University of New South Wales. Retrieved from http://handle.unsw.edu.au/1959.4/54553 ; https://unsworks.unsw.edu.au/fapi/datastream/unsworks:35293/SOURCE02?view=true

Chicago Manual of Style (16^th Edition):

Nguyen, Duong Dinh. “Effects of cellulose ether and polyvinyl alcohol on hydration and rheology of cementitious tile adhesives.” 2015. Doctoral Dissertation, University of New South Wales. Accessed January 15, 2021. http://handle.unsw.edu.au/1959.4/54553 ; https://unsworks.unsw.edu.au/fapi/datastream/unsworks:35293/SOURCE02?view=true.

MLA Handbook (7^th Edition):

Nguyen, Duong Dinh. “Effects of cellulose ether and polyvinyl alcohol on hydration and rheology of cementitious tile adhesives.” 2015. Web. 15 Jan 2021.

Vancouver:

Nguyen DD. Effects of cellulose ether and polyvinyl alcohol on hydration and rheology of cementitious tile adhesives. [Internet] [Doctoral dissertation]. University of New South Wales; 2015. [cited 2021 Jan 15]. Available from: http://handle.unsw.edu.au/1959.4/54553 ; https://unsworks.unsw.edu.au/fapi/datastream/unsworks:35293/SOURCE02?view=true.

Council of Science Editors:

Nguyen DD. Effects of cellulose ether and polyvinyl alcohol on hydration and rheology of cementitious tile adhesives. [Doctoral Dissertation]. University of New South Wales; 2015. Available from: http://handle.unsw.edu.au/1959.4/54553 ; https://unsworks.unsw.edu.au/fapi/datastream/unsworks:35293/SOURCE02?view=true

Ryerson University

6. Hamad, Dina. Experimental investigation of polyvinyl alcohol degradation in UV/H202 photochemical reactors using different hydrogen peroxide feeding strategies.

Degree: 2015, Ryerson University

URL: https://digital.library.ryerson.ca/islandora/object/RULA%3A4606

► Synthetic water-soluble polymers are popular in industry and they are produced in large scale owing to their wide spectrum of applications. In particular, the polyvinyl… (more)

▼ Synthetic water-soluble polymers are popular in industry and they are produced in large scale owing to their wide spectrum of applications. In particular, the polyvinyl alcohol polymer (PVA), a well-known refractory pollutant, is abundant in wastewater effluents since it is heavily used in industry as paper coating and polarization layer in liquid crystal displays (LCDs). These polymers are non-biodegradable and contaminant to water resources. Alternatively, they can be effectively removed by advanced oxidation processes (AOPs). This study investigates the photo-oxidative degradation of aqueous PVA solution in UV/H2O2 photoreactors and the effect of hydrogen peroxide feeding strategies on the photoreactor performance. The research covers thoroughly the impact of operating conditions on the polymer number average molecular weight (Mn), TOC content, and H2O2 residual under batch, fed-batch and continuous modes of operation. The experimental results show that the performance of the fed-batch photoreactor was higher than the batch system for similar experimental conditions revealing that the way H2O2 is fed into the system has a considerable effect on the PVA degradation. The experimental result of batch system was used as a guide to develop a photochemical kinetic model of the PVA degradation in UV/H2O2 batch process that describes the disintegration of the polymer chains in which the statistical moment approach was considered. The model predictions are in good agreement with data. Realizing the limitations of batch and fed-batch UV/H2O2 processes, an innovative continuous treatment technique was devised to enhance the process performance and to minimize UV dosage. Response surface methodology (RSM), based on Box-Behnken method, was adopted for design set of experiments required to determine the impact of operating variables and their interaction on the process performance. Finally, the results show that Mn was reduced from 130 kg/mol to 24.9, 20.3, and 2.2 kg/mol, corresponding to percent TOC removal of 41.5, 64.2 and 94.4 and H202 residual of 17, 3 and 1% were achieved in batch, fed-batch (120-min), and continuous (30-min) UV/H2O2 photoreactors, respectively. In addition, the overall power consumption of the process was assessed to determine the economic incentive for continuous feeding strategy and ensure the possibility of the process scale-up.

Subjects/Keywords: Water-soluble polymers; Aqueous polymeric coatings; Polyvinyl alcohol – Deterioration; Polyvinyl alcohol – Mathematical models

Record Details Similar Records Cite « Share

❌

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

APA (6^th Edition):

Hamad, D. (2015). Experimental investigation of polyvinyl alcohol degradation in UV/H202 photochemical reactors using different hydrogen peroxide feeding strategies. (Thesis). Ryerson University. Retrieved from https://digital.library.ryerson.ca/islandora/object/RULA%3A4606

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):

Hamad, Dina. “Experimental investigation of polyvinyl alcohol degradation in UV/H202 photochemical reactors using different hydrogen peroxide feeding strategies.” 2015. Thesis, Ryerson University. Accessed January 15, 2021. https://digital.library.ryerson.ca/islandora/object/RULA%3A4606.

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

MLA Handbook (7^th Edition):

Hamad, Dina. “Experimental investigation of polyvinyl alcohol degradation in UV/H202 photochemical reactors using different hydrogen peroxide feeding strategies.” 2015. Web. 15 Jan 2021.

Vancouver:

Hamad D. Experimental investigation of polyvinyl alcohol degradation in UV/H202 photochemical reactors using different hydrogen peroxide feeding strategies. [Internet] [Thesis]. Ryerson University; 2015. [cited 2021 Jan 15]. Available from: https://digital.library.ryerson.ca/islandora/object/RULA%3A4606.

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

Council of Science Editors:

Hamad D. Experimental investigation of polyvinyl alcohol degradation in UV/H202 photochemical reactors using different hydrogen peroxide feeding strategies. [Thesis]. Ryerson University; 2015. Available from: https://digital.library.ryerson.ca/islandora/object/RULA%3A4606

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

University of Waterloo

7. Pohan, Grace. Endothelialisation of Polyvinyl Alcohol Small Diameter Vascular Graft.

Degree: 2018, University of Waterloo

URL: http://hdl.handle.net/10012/13206

► As one of the possible treatments for cardiovascular disease (CVD), bypass grafting in small diameter vessel (≤ 6 mm diameter) is often employed. However, maintaining… (more)

▼ As one of the possible treatments for cardiovascular disease (CVD), bypass grafting in small diameter vessel (≤ 6 mm diameter) is often employed. However, maintaining the patency of this small diameter graft remains a challenge despite 50 years of research in this area. While ePTFE graft performance as a large diameter vascular graft is commendable and has been widely used in patients, the performance of ePTFE small diameter vascular graft is disappointing with 65% graft patency rate at 1 year.1 It was observed that graft occlusion is caused mainly by thrombus or intima hyperplasia (IH) formation. This study proposes the use of sodium trimetaphosphate (STMP) crosslinked polyvinyl alcohol (PVA) as small diameter vascular graft due to its low thrombogenicity and excellent mechanical property. However, PVA hydrophilicity is known to hinder any extracellular matrix (ECM) protein or cell attachment on its surface, while surface endothelialisation is believed to prevent thrombus and IH formation. We hypothesize that NH3 plasma luminal modification on the luminal surface of PVA along with hydrogel patterning with microtopography can improve surface interaction with endothelial cells. Additionally, we speculate the effect of terminal sterilization step on PVA grafts is minimum and the grafts can maintain its patency at 28 to 30-day timepoint. Endothelial cell attachment on PVA surface was found to improve on plasma treated luminal surface with 2 µm gratings topography. Endothelial gene expressions (PECAM1 and NOS3) were, however, found to be downregulated on plasma treated substrates. However, platelet and fibrin activation of the microgratings topography done with baboon ex vivo shunt model was comparable or lower than ePTFE graft control and collagen coated glass conduit. Furthermore, sterilization of PVA graft with γ-radiation was not found to have any toxic effect on cells and interestingly improve endothelialisation. While EtO sterilization was shown to alter PVA mechanical and material properties, γ-radiation only affected PVA graft mechanical compliance. Gamma irradiated small diameter PVA graft (2 mm ID) without any surface topography was implanted with end-to-side anastomoses at the right common carotid artery to assess PVA performance over 28-30 days in rabbit models. Five out of 7 PVA grafts were found patent after 28-30 days of implantation, while only 1 out of 2 ePTFE grafts were patent after 28-30 days. Endothelialisation of PVA graft in vivo was, however, not yet observed which compels the importance of plasma treatment and topography incorporation in the future work.

Subjects/Keywords: endothelial; vascular graft; polyvinyl alcohol; hydrogel; Endothelial seeding; Vascular grafts; Polyvinyl alcohol; Colloids

Record Details Similar Records Cite « Share

❌

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

APA (6^th Edition):

Pohan, G. (2018). Endothelialisation of Polyvinyl Alcohol Small Diameter Vascular Graft. (Thesis). University of Waterloo. Retrieved from http://hdl.handle.net/10012/13206

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):

Pohan, Grace. “Endothelialisation of Polyvinyl Alcohol Small Diameter Vascular Graft.” 2018. Thesis, University of Waterloo. Accessed January 15, 2021. http://hdl.handle.net/10012/13206.

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

MLA Handbook (7^th Edition):

Pohan, Grace. “Endothelialisation of Polyvinyl Alcohol Small Diameter Vascular Graft.” 2018. Web. 15 Jan 2021.

Vancouver:

Pohan G. Endothelialisation of Polyvinyl Alcohol Small Diameter Vascular Graft. [Internet] [Thesis]. University of Waterloo; 2018. [cited 2021 Jan 15]. Available from: http://hdl.handle.net/10012/13206.

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

Council of Science Editors:

Pohan G. Endothelialisation of Polyvinyl Alcohol Small Diameter Vascular Graft. [Thesis]. University of Waterloo; 2018. Available from: http://hdl.handle.net/10012/13206

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

NSYSU

8. Liao, Jing-fong. Flexible and Rapidly-Dissolvable Microneedle Patches for Transdermal Delivery and Stability Enhancement of DNA Vaccine.

Degree: Master, Institute of Medical Science and Technology, 2016, NSYSU

URL: http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0529116-155910

► This study developed a flexible and rapidly-dissolvable microneedle (MN) patch for transdermal delivery and stability enhancement of DNA vaccine. The MN patch is made by… (more)

Subjects/Keywords: Transcutaneous immunization; Dissolving microneedle; DNA vaccine; Flexible patches; Polyvinyl alcohol

Record Details Similar Records Cite « Share

❌

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

APA (6^th Edition):

Liao, J. (2016). Flexible and Rapidly-Dissolvable Microneedle Patches for Transdermal Delivery and Stability Enhancement of DNA Vaccine. (Thesis). NSYSU. Retrieved from http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0529116-155910

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):

Liao, Jing-fong. “Flexible and Rapidly-Dissolvable Microneedle Patches for Transdermal Delivery and Stability Enhancement of DNA Vaccine.” 2016. Thesis, NSYSU. Accessed January 15, 2021. http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0529116-155910.

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

MLA Handbook (7^th Edition):

Liao, Jing-fong. “Flexible and Rapidly-Dissolvable Microneedle Patches for Transdermal Delivery and Stability Enhancement of DNA Vaccine.” 2016. Web. 15 Jan 2021.

Vancouver:

Liao J. Flexible and Rapidly-Dissolvable Microneedle Patches for Transdermal Delivery and Stability Enhancement of DNA Vaccine. [Internet] [Thesis]. NSYSU; 2016. [cited 2021 Jan 15]. Available from: http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0529116-155910.

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

Council of Science Editors:

Liao J. Flexible and Rapidly-Dissolvable Microneedle Patches for Transdermal Delivery and Stability Enhancement of DNA Vaccine. [Thesis]. NSYSU; 2016. Available from: http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0529116-155910

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

9. Sajimol Augustine, M. Investigations on novel polymer nano composites and bio-compatible manganese doped ZnS nanocrystals for photonic and bio-imaging applications.

Degree: Physics, 2012, Cochin University of Science and Technology

URL: http://dyuthi.cusat.ac.in/purl/3691

►

Fluorescence is a powerful tool in biological research, the relevance of which relies greatly on the availability of sensitive and selective fluorescent probes. Nanometer sized… (more)

Subjects/Keywords: Nanoscience; Nanotechnology; Nanobiotechnology; Nanoscale materials; Zinc Oxide/Polyvinyl Alcohol

Record Details Similar Records Cite « Share

❌

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

APA (6^th Edition):

Sajimol Augustine, M. (2012). Investigations on novel polymer nano composites and bio-compatible manganese doped ZnS nanocrystals for photonic and bio-imaging applications. (Thesis). Cochin University of Science and Technology. Retrieved from http://dyuthi.cusat.ac.in/purl/3691

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):

Sajimol Augustine, M. “Investigations on novel polymer nano composites and bio-compatible manganese doped ZnS nanocrystals for photonic and bio-imaging applications.” 2012. Thesis, Cochin University of Science and Technology. Accessed January 15, 2021. http://dyuthi.cusat.ac.in/purl/3691.

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

MLA Handbook (7^th Edition):

Sajimol Augustine, M. “Investigations on novel polymer nano composites and bio-compatible manganese doped ZnS nanocrystals for photonic and bio-imaging applications.” 2012. Web. 15 Jan 2021.

Vancouver:

Sajimol Augustine M. Investigations on novel polymer nano composites and bio-compatible manganese doped ZnS nanocrystals for photonic and bio-imaging applications. [Internet] [Thesis]. Cochin University of Science and Technology; 2012. [cited 2021 Jan 15]. Available from: http://dyuthi.cusat.ac.in/purl/3691.

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

Council of Science Editors:

Sajimol Augustine M. Investigations on novel polymer nano composites and bio-compatible manganese doped ZnS nanocrystals for photonic and bio-imaging applications. [Thesis]. Cochin University of Science and Technology; 2012. Available from: http://dyuthi.cusat.ac.in/purl/3691

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

University of Houston

10. Sun, Sicong. Synthesis and Characterization of Carbon Nanofiber Sheet Reinforced Polyvinyl Alcohol (PVA) Composite.

Degree: MS, Materials Engineering, University of Houston

URL: http://hdl.handle.net/10657/2816

► Carbon nanofibers (CNF) reinforced polymer composites with lightweight, sustainability of large deformation, oil and corrosion resistance can have positive impact on a wide range of… (more)

Subjects/Keywords: Carbon nanofibers; Polyvinyl alcohol (PVA)

Record Details Similar Records Cite « Share

❌

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

APA (6^th Edition):

Sun, S. (n.d.). Synthesis and Characterization of Carbon Nanofiber Sheet Reinforced Polyvinyl Alcohol (PVA) Composite. (Masters Thesis). University of Houston. Retrieved from http://hdl.handle.net/10657/2816

Note: this citation may be lacking information needed for this citation format:
No year of publication.

Chicago Manual of Style (16^th Edition):

Sun, Sicong. “Synthesis and Characterization of Carbon Nanofiber Sheet Reinforced Polyvinyl Alcohol (PVA) Composite.” Masters Thesis, University of Houston. Accessed January 15, 2021. http://hdl.handle.net/10657/2816.

Note: this citation may be lacking information needed for this citation format:
No year of publication.

MLA Handbook (7^th Edition):

Sun, Sicong. “Synthesis and Characterization of Carbon Nanofiber Sheet Reinforced Polyvinyl Alcohol (PVA) Composite.” Web. 15 Jan 2021.

Note: this citation may be lacking information needed for this citation format:
No year of publication.

Vancouver:

Sun S. Synthesis and Characterization of Carbon Nanofiber Sheet Reinforced Polyvinyl Alcohol (PVA) Composite. [Internet] [Masters thesis]. University of Houston; [cited 2021 Jan 15]. Available from: http://hdl.handle.net/10657/2816.

Note: this citation may be lacking information needed for this citation format:
No year of publication.

Council of Science Editors:

Sun S. Synthesis and Characterization of Carbon Nanofiber Sheet Reinforced Polyvinyl Alcohol (PVA) Composite. [Masters Thesis]. University of Houston; Available from: http://hdl.handle.net/10657/2816

Note: this citation may be lacking information needed for this citation format:
No year of publication.

University of Oxford

11. Thomas, Matthew Rhys. Polyvinyl alcohol surface modification.

Degree: PhD, 2011, University of Oxford

URL: http://ora.ox.ac.uk/objects/uuid:279fe53b-7d61-43de-a91a-be658dd01eda ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.555358

► Poly(vinyl alcohol) (PVA) is a polymer used in numerous applications, principally those in which its high water solubility is a desirable asset. However there are… (more)

▼ Poly(vinyl alcohol) (PVA) is a polymer used in numerous applications, principally those in which its high water solubility is a desirable asset. However there are also areas where PVA is limited by its inherent solubility (for example some specific environments in the biomedical field). This work has sought to overcome such limits by manipulating the surface of PVA in order to propose various means by which the surface solvent resistance might be increased while maintaining the bulk properties of the polymer. Both chemical and physical modifications have been tried and in each case progress has been made towards insolubilizing a single surface of the polymer when in film form. Grafting various species onto the surface of PVA was successfully performed. It is believed that such species bonded to the PVA via attachment to the hydroxyl groups (though this has not been proven conclusively). The data contained herein has led to the conclusion that the primary factor in reducing solubility this way is the removal of the hydroxyl groups, and not the attachment of specifically highly hydrophobic molecules. Introducing permanent cross-links into the surface region has been attempted via various routes. The data recorded shows promise however the system is far from optimised. The biggest challenge remaining is to optimise the depth of material cross-linked. Some steps have been made towards understanding and controlling this parameter though there is much scope for further investigation. The methods used have built on those used for bulk cross-linking and as such are new for the case of surface specific treatment. An interesting phenomenon in some semi-crystalline polymers reported in recent years is that of surface specific crystallization. This effect has been successfully induced and observed in PVA to produce what is believed to be a highly crystalline surface layer, and crystalline regions of PVA are generally accepted to be more water resistant than amorphous ones. In summary, in this work several surface-specific treatments for PVA have been trialled, providing options for post-film forming modification to reduce the surface water sensitivity whilst retaining the bulk properties of the polymer.

Subjects/Keywords: 667.9; Materials Sciences; Surfaces; Polymers; polyvinyl alcohol; pva; pvoh; surface modification

Record Details Similar Records Cite « Share

❌

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

APA (6^th Edition):

Thomas, M. R. (2011). Polyvinyl alcohol surface modification. (Doctoral Dissertation). University of Oxford. Retrieved from http://ora.ox.ac.uk/objects/uuid:279fe53b-7d61-43de-a91a-be658dd01eda ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.555358

Chicago Manual of Style (16^th Edition):

Thomas, Matthew Rhys. “Polyvinyl alcohol surface modification.” 2011. Doctoral Dissertation, University of Oxford. Accessed January 15, 2021. http://ora.ox.ac.uk/objects/uuid:279fe53b-7d61-43de-a91a-be658dd01eda ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.555358.

MLA Handbook (7^th Edition):

Thomas, Matthew Rhys. “Polyvinyl alcohol surface modification.” 2011. Web. 15 Jan 2021.

Vancouver:

Thomas MR. Polyvinyl alcohol surface modification. [Internet] [Doctoral dissertation]. University of Oxford; 2011. [cited 2021 Jan 15]. Available from: http://ora.ox.ac.uk/objects/uuid:279fe53b-7d61-43de-a91a-be658dd01eda ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.555358.

Council of Science Editors:

Thomas MR. Polyvinyl alcohol surface modification. [Doctoral Dissertation]. University of Oxford; 2011. Available from: http://ora.ox.ac.uk/objects/uuid:279fe53b-7d61-43de-a91a-be658dd01eda ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.555358

KTH

12. Chen, Hongjian. Towards the Development of the Dual Modal Contrast Agent for Computed Tomography and Ultrasound.

Degree: Technology and Health (STH), 2016, KTH

URL: http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-193929

► Nowadays hybrid imaging modalities are new trends in medical imaging. To improve the diagnostic outcome of hybrid imaging, multimodal contrast agents need to be… (more)

Subjects/Keywords: Computed tomography; Ultrasound; Hybrid contrast agents; Polyvinyl alcohol; Medical Engineering; Medicinteknik

Record Details Similar Records Cite « Share

❌

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

APA (6^th Edition):

Chen, H. (2016). Towards the Development of the Dual Modal Contrast Agent for Computed Tomography and Ultrasound. (Thesis). KTH. Retrieved from http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-193929

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):

Chen, Hongjian. “Towards the Development of the Dual Modal Contrast Agent for Computed Tomography and Ultrasound.” 2016. Thesis, KTH. Accessed January 15, 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-193929.

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

MLA Handbook (7^th Edition):

Chen, Hongjian. “Towards the Development of the Dual Modal Contrast Agent for Computed Tomography and Ultrasound.” 2016. Web. 15 Jan 2021.

Vancouver:

Chen H. Towards the Development of the Dual Modal Contrast Agent for Computed Tomography and Ultrasound. [Internet] [Thesis]. KTH; 2016. [cited 2021 Jan 15]. Available from: http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-193929.

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

Council of Science Editors:

Chen H. Towards the Development of the Dual Modal Contrast Agent for Computed Tomography and Ultrasound. [Thesis]. KTH; 2016. Available from: http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-193929

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

Brno University of Technology

13. Linha, Vojtěch. Homogenita aditiv v nanovláknech: Homogenity of aditives in nanofibres.

Degree: 2019, Brno University of Technology

URL: http://hdl.handle.net/11012/31387

► The goal of this thesis was to summarize basic options of fiber spinning and incorporation of additives. Options for nanofiber production by 4SPIN® are described… (more)

Subjects/Keywords: nanovlákna; aditiva; hyaluronan; polyvinylalkohol; nanofiber; additives; hyaluronan; polyvinyl alcohol

Record Details Similar Records Cite « Share

❌

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

APA (6^th Edition):

Linha, V. (2019). Homogenita aditiv v nanovláknech: Homogenity of aditives in nanofibres. (Thesis). Brno University of Technology. Retrieved from http://hdl.handle.net/11012/31387

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):

Linha, Vojtěch. “Homogenita aditiv v nanovláknech: Homogenity of aditives in nanofibres.” 2019. Thesis, Brno University of Technology. Accessed January 15, 2021. http://hdl.handle.net/11012/31387.

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

MLA Handbook (7^th Edition):

Linha, Vojtěch. “Homogenita aditiv v nanovláknech: Homogenity of aditives in nanofibres.” 2019. Web. 15 Jan 2021.

Vancouver:

Linha V. Homogenita aditiv v nanovláknech: Homogenity of aditives in nanofibres. [Internet] [Thesis]. Brno University of Technology; 2019. [cited 2021 Jan 15]. Available from: http://hdl.handle.net/11012/31387.

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

Council of Science Editors:

Linha V. Homogenita aditiv v nanovláknech: Homogenity of aditives in nanofibres. [Thesis]. Brno University of Technology; 2019. Available from: http://hdl.handle.net/11012/31387

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

Brno University of Technology

14. Debnáriková, Michaela. Příprava chitinových filmů: Preparation of chitin film.

Degree: 2019, Brno University of Technology

URL: http://hdl.handle.net/11012/173473

► The bachelor thesis deals with the extraction, purification, dissolution and preparation of film based on chitin/ polyvinyl alcohol (PVA). The pure chitin was fully characterized… (more)

Subjects/Keywords: Chitin; Polyvinylalkohol; film; reologické vlastnosti; Chitin; Polyvinyl alcohol; film; rheological properties

Record Details Similar Records Cite « Share

❌

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

APA (6^th Edition):

Debnáriková, M. (2019). Příprava chitinových filmů: Preparation of chitin film. (Thesis). Brno University of Technology. Retrieved from http://hdl.handle.net/11012/173473

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):

Debnáriková, Michaela. “Příprava chitinových filmů: Preparation of chitin film.” 2019. Thesis, Brno University of Technology. Accessed January 15, 2021. http://hdl.handle.net/11012/173473.

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

MLA Handbook (7^th Edition):

Debnáriková, Michaela. “Příprava chitinových filmů: Preparation of chitin film.” 2019. Web. 15 Jan 2021.

Vancouver:

Debnáriková M. Příprava chitinových filmů: Preparation of chitin film. [Internet] [Thesis]. Brno University of Technology; 2019. [cited 2021 Jan 15]. Available from: http://hdl.handle.net/11012/173473.

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

Council of Science Editors:

Debnáriková M. Příprava chitinových filmů: Preparation of chitin film. [Thesis]. Brno University of Technology; 2019. Available from: http://hdl.handle.net/11012/173473

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

University of Arizona

15. Merkle, Valerie Marie. Fabrication, Biocompatibility, and Tissue Engineering Substrate Analysis of Polyvinyl Alcohol-Gelatin Core-Shell Electrospun Nanofibers .

Degree: 2013, University of Arizona

URL: http://hdl.handle.net/10150/311690

► Cardiovascular disease is the leading cause of death in the United States with approximately 49% of the cardiovascular related deaths attributed to coronary heart disease… (more)

▼ Cardiovascular disease is the leading cause of death in the United States with approximately 49% of the cardiovascular related deaths attributed to coronary heart disease (CHD). CHD is the accumulation of plaque resulting in the narrowing of the vessel lumen and a decrease in blood flow to the downstream heart muscle. In order to restore blood flow, arterial by-pass procedures can be undertaken. However, the patient's own arteries/veins may not be suitable for use as a vessel replacement, and synthetic grafts lack the compliancy and durability needed for these small diameter locations (<5 mm). Therefore, the goal of this research is to develop a nanofibrous material that can be used in vascular applications such as this. In this study, we fabricate coaxial electrospun nanofibers with gelatin in the shell and polyvinyl alcohol (PVA) in the core using 1 Gelatin: 1 PVA and 3 Gelatin: 1 PVA mass ratios. Gelatin, derived from collagen, is highly bioactive while PVA, a synthetic polymer, has appealing mechanical properties. Therefore, by combining these materials in a core-shell structure, we hypothesize that the resulting nanofibers will have enhanced mechanical properties, cellular growth and migration, as well as minimal platelet deposition and activation compared to scaffolds composed solely of gelatin or PVA. First, the coaxial scaffolds exhibited an enhanced Young's modulus and ultimate strength compared to scaffolds composed of PVA or gelatin alone. Endothelial cells had high proliferation and migration on the coaxial electrospun scaffolds with higher migration seen on the stiffer, coaxial scaffolds. The smooth muscle cells had less proliferation and lower migration rates on the coaxial scaffolds than the endothelial cells. Using a modified prothrombinase assay, the coaxial scaffolds had minimal platelet activation. Lastly, when pre-seeding the coaxial scaffolds with endothelial cells or smooth muscle cells, the platelet deposition decreased in comparison to platelet deposition with no cell pre-seeding. Overall, the 1 Gel: 1 PVA coaxial scaffolds promoted endothelial cell growth and migration, minimized smooth muscle cell growth and migration, and had minimal platelet activation. Therefore, the 1 Gel: 1 PVA coaxial nanofibers are an intriguing material for use in vascular applications. Advisors/Committee Members: Wu, Xiaoyi (advisor), Wu, Xiaoyi (committeemember), Regan, John W. (committeemember), Cohen, Zoe (committeemember), Slepian, Marvin J. (committeemember), Yoon, Jeong-Yeol (committeemember).

Subjects/Keywords: coaxial nanofibers; gelatin; polyvinyl alcohol; tissue engineering; vascular; Biomedical Engineering; biocompatibility

Record Details Similar Records Cite « Share

❌

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

APA (6^th Edition):

Merkle, V. M. (2013). Fabrication, Biocompatibility, and Tissue Engineering Substrate Analysis of Polyvinyl Alcohol-Gelatin Core-Shell Electrospun Nanofibers . (Doctoral Dissertation). University of Arizona. Retrieved from http://hdl.handle.net/10150/311690

Chicago Manual of Style (16^th Edition):

Merkle, Valerie Marie. “Fabrication, Biocompatibility, and Tissue Engineering Substrate Analysis of Polyvinyl Alcohol-Gelatin Core-Shell Electrospun Nanofibers .” 2013. Doctoral Dissertation, University of Arizona. Accessed January 15, 2021. http://hdl.handle.net/10150/311690.

MLA Handbook (7^th Edition):

Merkle, Valerie Marie. “Fabrication, Biocompatibility, and Tissue Engineering Substrate Analysis of Polyvinyl Alcohol-Gelatin Core-Shell Electrospun Nanofibers .” 2013. Web. 15 Jan 2021.

Vancouver:

Merkle VM. Fabrication, Biocompatibility, and Tissue Engineering Substrate Analysis of Polyvinyl Alcohol-Gelatin Core-Shell Electrospun Nanofibers . [Internet] [Doctoral dissertation]. University of Arizona; 2013. [cited 2021 Jan 15]. Available from: http://hdl.handle.net/10150/311690.

Council of Science Editors:

Merkle VM. Fabrication, Biocompatibility, and Tissue Engineering Substrate Analysis of Polyvinyl Alcohol-Gelatin Core-Shell Electrospun Nanofibers . [Doctoral Dissertation]. University of Arizona; 2013. Available from: http://hdl.handle.net/10150/311690

Georgia Tech

16. Onubogu, Kenechukwu A. Effect of binder amount and calcination temperature on the physical and mechanical properties of pressed metal organic framework UiO-66.

Degree: MS, Chemical and Biomolecular Engineering, 2014, Georgia Tech

URL: http://hdl.handle.net/1853/53426

► Metal-organic framework (MOF) materials are a novel set of porous crystalline materials that have generated great scientific interest within the past two decades due to… (more)

Subjects/Keywords: Metal organic framework; Binders; Mechanical strength; Adsorption; Polyvinyl alcohol

Record Details Similar Records Cite « Share

❌

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

APA (6^th Edition):

Onubogu, K. A. (2014). Effect of binder amount and calcination temperature on the physical and mechanical properties of pressed metal organic framework UiO-66. (Masters Thesis). Georgia Tech. Retrieved from http://hdl.handle.net/1853/53426

Chicago Manual of Style (16^th Edition):

Onubogu, Kenechukwu A. “Effect of binder amount and calcination temperature on the physical and mechanical properties of pressed metal organic framework UiO-66.” 2014. Masters Thesis, Georgia Tech. Accessed January 15, 2021. http://hdl.handle.net/1853/53426.

MLA Handbook (7^th Edition):

Onubogu, Kenechukwu A. “Effect of binder amount and calcination temperature on the physical and mechanical properties of pressed metal organic framework UiO-66.” 2014. Web. 15 Jan 2021.

Vancouver:

Onubogu KA. Effect of binder amount and calcination temperature on the physical and mechanical properties of pressed metal organic framework UiO-66. [Internet] [Masters thesis]. Georgia Tech; 2014. [cited 2021 Jan 15]. Available from: http://hdl.handle.net/1853/53426.

Council of Science Editors:

Onubogu KA. Effect of binder amount and calcination temperature on the physical and mechanical properties of pressed metal organic framework UiO-66. [Masters Thesis]. Georgia Tech; 2014. Available from: http://hdl.handle.net/1853/53426

Louisiana State University

17. Han, Jingquan. Preparation and characterization of cellulose nanoparticles and their application in biopolymeric nanocomposites.

Degree: PhD, Environmental Sciences, 2013, Louisiana State University

URL: etd-10232013-142737 ; https://digitalcommons.lsu.edu/gradschool_dissertations/3462

► Regenerated cellulose nanoparticles (RCNs) including both elongated fiber and spherical structures were prepared from microcrystalline cellulose (MCC) and cotton using 1-butyl-3-methylimidazolium chloride followed by high-pressure… (more)

▼ Regenerated cellulose nanoparticles (RCNs) including both elongated fiber and spherical structures were prepared from microcrystalline cellulose (MCC) and cotton using 1-butyl-3-methylimidazolium chloride followed by high-pressure homogenization. The RCN has a two-step pyrolysis, different from raw MCC and cotton that had a one-step process. The crystalline structure of RCNs was cellulose II in contrast to the cellulose I form of the starting materials. Also, the RCNs have decreased crystallinity and crystallite size. The elongated RCNs produced from cotton and MCC had average lengths of 123 ± 34 and 112 ± 42 nm, and mean widths of 12 ± 5 and 12 ± 3 nm, respectively. The average diameter of spherical RCNs from MCC was 118 ± 32 nm. Cellulose nanocrystals and cellulose nanofibers with I and II crystalline allomorphs (designated as CNC I, CNC II, CNF I, and CNF II) were isolated from bleached wood fibers by alkaline pretreatment and acid hydrolysis. The effects of concentration, particle size, surface charge, and crystal structure on the lyophilization-induced self-assembly of cellulose particles in aqueous suspensions were studied. Within the concentration range of 0.5 to 1.0 wt %, cellulose particles self-organized into lamellar structured foam composed of aligned membrane layers with widths between 0.5 and 3 ì m. At 0.05 wt %, CNC I, CNF I, CNC II, and CNF II self-assembled into oriented ultrafine fibers with mean diameters of 0.57, 1.02, 1.50, and 1.00 ì m, respectively. Cellulose nanoparticle (CNP) reinforced Polyvinyl alcohol-borax (PB) hydrogels were prepared through a facile approach in an aqueous medium. The obtained stiff, high-water-capacity (~96%), low-density (~1.1g/cm3), translucence hydrogels exhibited birefringence textures. These free-standing, high elasticity and mouldable hydrogels also exhibited self-recovery under continuous step strain and thermo-reversibility under temperature sweep. The rheological tests and compression measurements confirmed the incorporation of well-dispersed CNPs to PB system significantly enhanced the compressive strength, viscoelasticity and stiffness of the hydrogels. Highly-crystalline CNPs not only tangled with PVA chains though numerous hydrogen bonds, but formed chemically crosslinked complexes with borax ions as well, thus acting as multifunctional crosslinking agents and nanofillers to physically and chemically bridge the 3D network hydrogels.

Subjects/Keywords: hydrogel; self-assemble; cellulose nanoparticles; ionic liquid; polyvinyl alcohol

Record Details Similar Records Cite « Share

❌

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

APA (6^th Edition):

Han, J. (2013). Preparation and characterization of cellulose nanoparticles and their application in biopolymeric nanocomposites. (Doctoral Dissertation). Louisiana State University. Retrieved from etd-10232013-142737 ; https://digitalcommons.lsu.edu/gradschool_dissertations/3462

Chicago Manual of Style (16^th Edition):

Han, Jingquan. “Preparation and characterization of cellulose nanoparticles and their application in biopolymeric nanocomposites.” 2013. Doctoral Dissertation, Louisiana State University. Accessed January 15, 2021. etd-10232013-142737 ; https://digitalcommons.lsu.edu/gradschool_dissertations/3462.

MLA Handbook (7^th Edition):

Han, Jingquan. “Preparation and characterization of cellulose nanoparticles and their application in biopolymeric nanocomposites.” 2013. Web. 15 Jan 2021.

Vancouver:

Han J. Preparation and characterization of cellulose nanoparticles and their application in biopolymeric nanocomposites. [Internet] [Doctoral dissertation]. Louisiana State University; 2013. [cited 2021 Jan 15]. Available from: etd-10232013-142737 ; https://digitalcommons.lsu.edu/gradschool_dissertations/3462.

Council of Science Editors:

Han J. Preparation and characterization of cellulose nanoparticles and their application in biopolymeric nanocomposites. [Doctoral Dissertation]. Louisiana State University; 2013. Available from: etd-10232013-142737 ; https://digitalcommons.lsu.edu/gradschool_dissertations/3462

Georgia Tech

18. Schwartz, Jonathan William. Design and mechanical evaluation of an artificial meniscus implant.

Degree: MS, Mechanical Engineering, 2018, Georgia Tech

URL: http://hdl.handle.net/1853/61175

► The menisci are wedges of fibrocartilage in the knee joint that help to redistribute compressive loads by increasing the contact area within the joint. Meniscus… (more)

▼ The menisci are wedges of fibrocartilage in the knee joint that help to redistribute compressive loads by increasing the contact area within the joint. Meniscus tears are among the most common orthopedic injuries, but shortcomings with the current treatments leave a clinical need for a new method for repair or replacement. The meniscal tissue can only be repaired in limited cases due to its healing capacity and no artificial meniscal replacement is currently approved by the FDA. The most common treatment for meniscal tears is removal of the damaged tissue, or a meniscectomy. The contact stress in the joint increases proportionally with the amount of meniscus tissue removed due to the decrease in contact area, and the changes in contact stress leads to articular cartilage damage and the development of osteoarthritis. This work explores the use of an artificial composite material with the shape, strength, properties, and contact mechanics needed to serve as a meniscal replacement implant following injury. In this research, a proposed artificial meniscus implant design is made from an aramid fiber-reinforced composite of polyvinyl alcohol (PVA) hydrogel, which is a promising biomaterial for orthopedic applications. A set of functional requirements and design specifications are created from literature values related to the loading experienced on the menisci in the knee joint and the mechanical properties of the natural menisci. Samples of the composite material underwent a series of tests to determine if the design specifications could be met. The ultimate strength (tensile and shear), the elastic modulus (tensile and compressive), resistance to change after cyclic loading, resistance to change after high magnitude compressive loading, and fiber tear out strength were evaluated. The pressure distributing properties of various meniscus implant prototypes and conditions in a knee joint model were also assessed. All design specifications were met using the composite material and the proposed implant design restored the contact mechanics within the knee joint model to natural conditions. The results of this work show that the right combination of material, structure, and shape for an artificial meniscus implant can provide the functional and mechanical properties needed to serve as a suitable meniscus replacement following injury. The artificial implant can be a possible treatment for damaged menisci that overcomes the deficiencies associated with the current options. Advisors/Committee Members: Ku, David N. (advisor), Guldberg, Robert (committee member), Temenoff, Johnna (committee member).

Subjects/Keywords: Meniscus; Implant; Knee; Hydrogel; Composite; Polyvinyl alcohol; Meniscus replacement; Aramid fiber

Record Details Similar Records Cite « Share

❌

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

APA (6^th Edition):

Schwartz, J. W. (2018). Design and mechanical evaluation of an artificial meniscus implant. (Masters Thesis). Georgia Tech. Retrieved from http://hdl.handle.net/1853/61175

Chicago Manual of Style (16^th Edition):

Schwartz, Jonathan William. “Design and mechanical evaluation of an artificial meniscus implant.” 2018. Masters Thesis, Georgia Tech. Accessed January 15, 2021. http://hdl.handle.net/1853/61175.

MLA Handbook (7^th Edition):

Schwartz, Jonathan William. “Design and mechanical evaluation of an artificial meniscus implant.” 2018. Web. 15 Jan 2021.

Vancouver:

Schwartz JW. Design and mechanical evaluation of an artificial meniscus implant. [Internet] [Masters thesis]. Georgia Tech; 2018. [cited 2021 Jan 15]. Available from: http://hdl.handle.net/1853/61175.

Council of Science Editors:

Schwartz JW. Design and mechanical evaluation of an artificial meniscus implant. [Masters Thesis]. Georgia Tech; 2018. Available from: http://hdl.handle.net/1853/61175

University of New South Wales

19. Aregueta Robles, Ulises Alejandro. Engineering a living electrode: Growth of neural networks within a 3D hydrogel.

Degree: Graduate School of Biomedical Engineering, 2017, University of New South Wales

URL: http://handle.unsw.edu.au/1959.4/57665 ; https://unsworks.unsw.edu.au/fapi/datastream/unsworks:44487/SOURCE02?view=true

► State-of-the-art neuroprosthetic devices rely on stiff metallic electrodes to communicate with neural tissues. It was envisioned that a soft, organic electrode coating embedded with functional… (more)

▼ State-of-the-art neuroprosthetic devices rely on stiff metallic electrodes to communicate with neural tissues. It was envisioned that a soft, organic electrode coating embedded with functional neural cells will enhance long term integration of neuroprosthetic devices with target cells through enabling development of synaptic connections between device and cell. To this end, this thesis explored the development of a degradable hydrogel scaffold to support neural network growth as a critical element for next-generation living electrodes.A significant challenge in developing this technology is to engineer a hydrogel carrier that can support growth and function of complex neuronal networks. In this thesis, the hydrogel poly(vinyl alcohol) functionalized with tyramine (PVA-Tyr) was used to explore the mechanical and biological cues necessary to support growth of neural tissues. To provide an appropriate neural cell niche, it is desirable to have not only neural cells, but supporting glia such as Schwann cells (SC) within the hydrogel carrier. It was hypothesized that specific mechanical and biochemical milieu for SC development within a 3D cellular scaffold will support neuronal cell growth and differentiation into functional neural networks.PVA hydrogels (5 wt% and 10 wt%) were fabricated with mechanical moduli comparable to nerve tissue while incorporating the biomolecules sericin and gelatin (PVA-SG) to support cell survival and attachment. The neuron-like PC12 cell was studied in co-culture with SCs to understand appropriate conditions for supporting growth and development of both cell types. This study also demonstrated techniques for assessing neurite outgrowth, neuronal electrical excitability and expression of matrix proteins used to understand network development in a 3D hydrogel. While both 5 wt% and 10wt% PVA-SG hydrogels were able to support SC survival, development of physiologically relevant morphologies was more prolific in 10 wt% PVA-SG. SCs and PC12s were co-encapsulated within PVA-SG hydrogels extending neurite networks that were physically supported by SCs to generate excitable neural networks. Microchannels were shown to guide the direction of neural network growth.It was demonstrated that PVA-SG hydrogels can support growth and differentiation of complex neural networks. Future work will focus on evaluating the development of neural stem cells within PVA-SG hydrogel scaffolds. Advisors/Committee Members: Morley, John W., University of Western Sydney.

Subjects/Keywords: neural networks; biosynthetic hydrogel; tissue engineering; polyvinyl alcohol; implantable device

Record Details Similar Records Cite « Share

❌

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

APA (6^th Edition):

Aregueta Robles, U. A. (2017). Engineering a living electrode: Growth of neural networks within a 3D hydrogel. (Doctoral Dissertation). University of New South Wales. Retrieved from http://handle.unsw.edu.au/1959.4/57665 ; https://unsworks.unsw.edu.au/fapi/datastream/unsworks:44487/SOURCE02?view=true

Chicago Manual of Style (16^th Edition):

Aregueta Robles, Ulises Alejandro. “Engineering a living electrode: Growth of neural networks within a 3D hydrogel.” 2017. Doctoral Dissertation, University of New South Wales. Accessed January 15, 2021. http://handle.unsw.edu.au/1959.4/57665 ; https://unsworks.unsw.edu.au/fapi/datastream/unsworks:44487/SOURCE02?view=true.

MLA Handbook (7^th Edition):

Aregueta Robles, Ulises Alejandro. “Engineering a living electrode: Growth of neural networks within a 3D hydrogel.” 2017. Web. 15 Jan 2021.

Vancouver:

Aregueta Robles UA. Engineering a living electrode: Growth of neural networks within a 3D hydrogel. [Internet] [Doctoral dissertation]. University of New South Wales; 2017. [cited 2021 Jan 15]. Available from: http://handle.unsw.edu.au/1959.4/57665 ; https://unsworks.unsw.edu.au/fapi/datastream/unsworks:44487/SOURCE02?view=true.

Council of Science Editors:

Aregueta Robles UA. Engineering a living electrode: Growth of neural networks within a 3D hydrogel. [Doctoral Dissertation]. University of New South Wales; 2017. Available from: http://handle.unsw.edu.au/1959.4/57665 ; https://unsworks.unsw.edu.au/fapi/datastream/unsworks:44487/SOURCE02?view=true

Texas State University – San Marcos

20. Hartline, Matthew C. Biodegradable Polymer/Halloysite Nanocomposites.

Degree: MS, Chemistry, 2012, Texas State University – San Marcos

URL: https://digital.library.txstate.edu/handle/10877/4412

► Biodegradable polymer/halloysite nanotube (HNT) nanocomposites have been found to have superior mechanical properties over that of the neat polymer. Two extremes of biodegradable polymers have… (more)

Subjects/Keywords: Halloysite; Nanocomposites; Biodegradable; Polymers; Halloysite; Nanocomposites (Materials); Nanotubes; Polyvinyl alcohol – Biodegradation

Record Details Similar Records Cite « Share

❌

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

APA (6^th Edition):

Hartline, M. C. (2012). Biodegradable Polymer/Halloysite Nanocomposites. (Masters Thesis). Texas State University – San Marcos. Retrieved from https://digital.library.txstate.edu/handle/10877/4412

Chicago Manual of Style (16^th Edition):

Hartline, Matthew C. “Biodegradable Polymer/Halloysite Nanocomposites.” 2012. Masters Thesis, Texas State University – San Marcos. Accessed January 15, 2021. https://digital.library.txstate.edu/handle/10877/4412.

MLA Handbook (7^th Edition):

Hartline, Matthew C. “Biodegradable Polymer/Halloysite Nanocomposites.” 2012. Web. 15 Jan 2021.

Vancouver:

Hartline MC. Biodegradable Polymer/Halloysite Nanocomposites. [Internet] [Masters thesis]. Texas State University – San Marcos; 2012. [cited 2021 Jan 15]. Available from: https://digital.library.txstate.edu/handle/10877/4412.

Council of Science Editors:

Hartline MC. Biodegradable Polymer/Halloysite Nanocomposites. [Masters Thesis]. Texas State University – San Marcos; 2012. Available from: https://digital.library.txstate.edu/handle/10877/4412

21. Trieu, Hai Hong. The processing/structure/property relationships of polyvinyl alcohol hydrogels.

Degree: PhD, Chemical Engineering, 1995, Case Western Reserve University School of Graduate Studies

URL: http://rave.ohiolink.edu/etdc/view?acc_num=case1058540388

► Polyvinyl alcohol (PVA) hydrogels were prepared using aqueous PVA solutions containing various dimethyl sulfoxide (DMSO) concentrations. Remarkably different PVA hydrogels were obtained by varying processing… (more)

▼ Polyvinyl alcohol (PVA) hydrogels were prepared using aqueous PVA solutions containing various dimethyl sulfoxide (DMSO) concentrations. Remarkably different PVA hydrogels were obtained by varying processing parameters, i.e. DMSO concentration, initial PVA concentration and quench temperature. A large variation in the surface and bulk structures of PVA hydrogels was observed by scanning electron microscopy for samples prepared by freeze-etching and critical point drying techniques. The processing conditions have a dramatic effect on the physical and mechanical properties of PVA hydrogels. PVA hydrogels prepared at low quench temperature using moderate to high DMSO concentrations have a low water content and a significantly improved hardness, tensile strength, elongation and tear resistance. Maximum properties are typically obtained near 75 wt% DMSO and at -60°C quench temperature. Under such conditions, gelation occurs rapidly before significant phase separation due to spinodal decomposition takes place, which results in a homogeneous gel structure. On the other hand, freezing that normally causes phase separation is dramatically retarded by the formation of DMSO-water complexes. This allows post-gelation crystallization to proceed that leads to a stable gel structure before freezing occurs. As a result, a homogeneous gel structure with maximum optical and mechanical properties is obtained. By varying the processing parameters, the gelation mechanism is altered which leads to three different types of hydrogel structures: (1) homogeneous gel, (2) heterogeneous gel without orientation, and (3) heterogeneous gel with oriented domains. Structural models representing the three types of hydrogels are proposed. The swelling behavior of PVA hydrogels in aqueous solutions of organic salts was investigated. The reswelling behavior of hydrogels was also studied using dehydrated specimens. Attempts were made to characterize the crystallinity of PVA hydrogels using a differential scanning calorimeter. The viscoelastic behavior of hydrogels was studied using a dynamic mechanical analyzer Advisors/Committee Members: Qutubuddin, Syed (Advisor).

Subjects/Keywords: Chemistry, Polymer; Polyvinyl alcohol hydrogels

Record Details Similar Records Cite « Share

❌

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

APA (6^th Edition):

Trieu, H. H. (1995). The processing/structure/property relationships of polyvinyl alcohol hydrogels. (Doctoral Dissertation). Case Western Reserve University School of Graduate Studies. Retrieved from http://rave.ohiolink.edu/etdc/view?acc_num=case1058540388

Chicago Manual of Style (16^th Edition):

Trieu, Hai Hong. “The processing/structure/property relationships of polyvinyl alcohol hydrogels.” 1995. Doctoral Dissertation, Case Western Reserve University School of Graduate Studies. Accessed January 15, 2021. http://rave.ohiolink.edu/etdc/view?acc_num=case1058540388.

MLA Handbook (7^th Edition):

Trieu, Hai Hong. “The processing/structure/property relationships of polyvinyl alcohol hydrogels.” 1995. Web. 15 Jan 2021.

Vancouver:

Trieu HH. The processing/structure/property relationships of polyvinyl alcohol hydrogels. [Internet] [Doctoral dissertation]. Case Western Reserve University School of Graduate Studies; 1995. [cited 2021 Jan 15]. Available from: http://rave.ohiolink.edu/etdc/view?acc_num=case1058540388.

Council of Science Editors:

Trieu HH. The processing/structure/property relationships of polyvinyl alcohol hydrogels. [Doctoral Dissertation]. Case Western Reserve University School of Graduate Studies; 1995. Available from: http://rave.ohiolink.edu/etdc/view?acc_num=case1058540388

University of Pretoria

22. [No author]. Urea-based moulding compounds for investment casting .

Degree: 2011, University of Pretoria

URL: http://upetd.up.ac.za/thesis/available/etd-05132009-155138/

► Conventional urea-based moulding compounds for investment casting patterns are manufactured using a slow “cooking” process. Nowadays in industrial processes the use of a faster process… (more)

▼ Conventional urea-based moulding compounds for investment casting patterns are manufactured using a slow “cooking” process. Nowadays in industrial processes the use of a faster process is highly recommended to increase throughput levels. At the same time, for quality control purposes, the requirements of an investment caster must be met. This study is therefore focused on: Finding the appropriate conventional process and conditions to prepare urea-based investment casting moulding compounds. Optimising the composition variables to meet the mechanical, thermal, surface, flow and cost properties needed in investment casting. Characterising the moulding compounds to meet the requirements of an investment caster by comparing them with an industrial, “cooked” urea-based compound. Polyvinyl alcohol (PVOH) and ethylene vinyl acetate (EVA) urea-based moulding compounds were prepared using a two-roll mill and a conventional extrusion processes respectively. It was possible to injection mould PVOH urea-based moulding compounds with a urea content of up to 90 wt % which had been compounded using a two-roll mill. Using the conventional extrusion process, it was also possible to compound and injection mould EVA urea-based moulding compounds containing up to 70 wt % urea. The effects on composition variables on the properties of the moulding compound were studied and compared to those of the existing “cooked” urea-based moulding compound (Benchmark). The mechanical properties were characterised using the three-point bending test and Charpy impact test. The thermal properties were determined using simultaneous differential thermal analysis and thermogravimetric analysis (SDTA/TGA) and differential scanning calorimeter (DSC). The thermo-mechanical and visco-elastic properties were determined using a dynamic mechanical analyser. A scanning electron microscope was used to study the surface texture of the mouldings. The EVA urea-based moulding compounds showed two endothermic melting peaks and multiple exothermic crystallisation peaks in the DSC curves. The peak at ca. 55 - 66°C corresponds to the melting of the wax/EVA blend, while the large peak at 130 - 132°C corresponds to the melting of the urea. The DSC heating curve of the PVOH urea-based moulding compounds showed two endothermic peaks. The small peak corresponds to the melting of the wax, while the large peak corresponds to the melting of the urea/PVOH blend. PVOH urea-based moulding compound had better mechanical properties than the industrial benchmark. The mechanical properties of the EVA urea-based compound were generally lower. The effect of the wax and polymer content on the mechanical properties was as follows: Increasing polymer content produced weaker but tougher moulding compounds. Increasing wax content improved the strength and stiffness but gave compounds that were less tough. Two-way Analysis of Variance (ANOVA) indicated significant polymer-wax interactions. The urea content… Advisors/Committee Members: Prof W W Focke (advisor).

Subjects/Keywords: Biodegradable pattern; Non-biodegradable pattern; Polyvinyl alcohol; Ethylene vinyl acetate; Wax; Urea; Investment casting; UCTD

Record Details Similar Records Cite « Share

❌

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

APA (6^th Edition):

author], [. (2011). Urea-based moulding compounds for investment casting . (Doctoral Dissertation). University of Pretoria. Retrieved from http://upetd.up.ac.za/thesis/available/etd-05132009-155138/

Chicago Manual of Style (16^th Edition):

author], [No. “Urea-based moulding compounds for investment casting .” 2011. Doctoral Dissertation, University of Pretoria. Accessed January 15, 2021. http://upetd.up.ac.za/thesis/available/etd-05132009-155138/.

MLA Handbook (7^th Edition):

author], [No. “Urea-based moulding compounds for investment casting .” 2011. Web. 15 Jan 2021.

Vancouver:

author] [. Urea-based moulding compounds for investment casting . [Internet] [Doctoral dissertation]. University of Pretoria; 2011. [cited 2021 Jan 15]. Available from: http://upetd.up.ac.za/thesis/available/etd-05132009-155138/.

Council of Science Editors:

author] [. Urea-based moulding compounds for investment casting . [Doctoral Dissertation]. University of Pretoria; 2011. Available from: http://upetd.up.ac.za/thesis/available/etd-05132009-155138/

University of Pretoria

23. Rutto, Hilary Kiplimo. Urea-based moulding compounds for investment casting.

Degree: Chemical Engineering, 2011, University of Pretoria

URL: http://hdl.handle.net/2263/24620

► Conventional urea-based moulding compounds for investment casting patterns are manufactured using a slow “cooking” process. Nowadays in industrial processes the use of a faster process… (more)

▼ Conventional urea-based moulding compounds for investment casting patterns are manufactured using a slow “cooking” process. Nowadays in industrial processes the use of a faster process is highly recommended to increase throughput levels. At the same time, for quality control purposes, the requirements of an investment caster must be met. This study is therefore focused on: Finding the appropriate conventional process and conditions to prepare urea-based investment casting moulding compounds. Optimising the composition variables to meet the mechanical, thermal, surface, flow and cost properties needed in investment casting. Characterising the moulding compounds to meet the requirements of an investment caster by comparing them with an industrial, “cooked” urea-based compound. Polyvinyl alcohol (PVOH) and ethylene vinyl acetate (EVA) urea-based moulding compounds were prepared using a two-roll mill and a conventional extrusion processes respectively. It was possible to injection mould PVOH urea-based moulding compounds with a urea content of up to 90 wt % which had been compounded using a two-roll mill. Using the conventional extrusion process, it was also possible to compound and injection mould EVA urea-based moulding compounds containing up to 70 wt % urea. The effects on composition variables on the properties of the moulding compound were studied and compared to those of the existing “cooked” urea-based moulding compound (Benchmark). The mechanical properties were characterised using the three-point bending test and Charpy impact test. The thermal properties were determined using simultaneous differential thermal analysis and thermogravimetric analysis (SDTA/TGA) and differential scanning calorimeter (DSC). The thermo-mechanical and visco-elastic properties were determined using a dynamic mechanical analyser. A scanning electron microscope was used to study the surface texture of the mouldings. The EVA urea-based moulding compounds showed two endothermic melting peaks and multiple exothermic crystallisation peaks in the DSC curves. The peak at ca. 55 - 66°C corresponds to the melting of the wax/EVA blend, while the large peak at 130 - 132°C corresponds to the melting of the urea. The DSC heating curve of the PVOH urea-based moulding compounds showed two endothermic peaks. The small peak corresponds to the melting of the wax, while the large peak corresponds to the melting of the urea/PVOH blend. PVOH urea-based moulding compound had better mechanical properties than the industrial benchmark. The mechanical properties of the EVA urea-based compound were generally lower. The effect of the wax and polymer content on the mechanical properties was as follows: Increasing polymer content produced weaker but tougher moulding compounds. Increasing wax content improved the strength and stiffness but gave compounds that were less tough. Two-way Analysis of Variance (ANOVA) indicated significant polymer-wax interactions. The urea content… Advisors/Committee Members: Prof W W Focke (advisor).

Subjects/Keywords: Biodegradable pattern; Non-biodegradable pattern; Polyvinyl alcohol; Ethylene vinyl acetate; Wax; Urea; Investment casting; UCTD

Record Details Similar Records Cite « Share

❌

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

APA (6^th Edition):

Rutto, H. (2011). Urea-based moulding compounds for investment casting. (Doctoral Dissertation). University of Pretoria. Retrieved from http://hdl.handle.net/2263/24620

Chicago Manual of Style (16^th Edition):

Rutto, Hilary. “Urea-based moulding compounds for investment casting.” 2011. Doctoral Dissertation, University of Pretoria. Accessed January 15, 2021. http://hdl.handle.net/2263/24620.

MLA Handbook (7^th Edition):

Rutto, Hilary. “Urea-based moulding compounds for investment casting.” 2011. Web. 15 Jan 2021.

Vancouver:

Rutto H. Urea-based moulding compounds for investment casting. [Internet] [Doctoral dissertation]. University of Pretoria; 2011. [cited 2021 Jan 15]. Available from: http://hdl.handle.net/2263/24620.

Council of Science Editors:

Rutto H. Urea-based moulding compounds for investment casting. [Doctoral Dissertation]. University of Pretoria; 2011. Available from: http://hdl.handle.net/2263/24620

24. Noor Mohamed, Noor Hisyam. DEVELOPMENT AND CHARACTERIZATION OF HIGH STRENGTH CELLULOSIC NANOFIBER AND POLYVINYL ALCOHOL (PVA) COMPOSITE MATERIALS : 高強度セルロースナノ繊維/ポリビニールアルコール複合材料の開発およびパフォーマンスの評価.

Degree: 博士（工学）, 2017, Tokushima University / 徳島大学

URL: http://repo.lib.tokushima-u.ac.jp/110136

Subjects/Keywords: Cellulosic nanofiber; polyvinyl alcohol; composite materials

Record Details Similar Records Cite « Share

❌

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

APA (6^th Edition):

Noor Mohamed, N. H. (2017). DEVELOPMENT AND CHARACTERIZATION OF HIGH STRENGTH CELLULOSIC NANOFIBER AND POLYVINYL ALCOHOL (PVA) COMPOSITE MATERIALS : 高強度セルロースナノ繊維/ポリビニールアルコール複合材料の開発およびパフォーマンスの評価. (Thesis). Tokushima University / 徳島大学. Retrieved from http://repo.lib.tokushima-u.ac.jp/110136

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):

Noor Mohamed, Noor Hisyam. “DEVELOPMENT AND CHARACTERIZATION OF HIGH STRENGTH CELLULOSIC NANOFIBER AND POLYVINYL ALCOHOL (PVA) COMPOSITE MATERIALS : 高強度セルロースナノ繊維/ポリビニールアルコール複合材料の開発およびパフォーマンスの評価.” 2017. Thesis, Tokushima University / 徳島大学. Accessed January 15, 2021. http://repo.lib.tokushima-u.ac.jp/110136.

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

MLA Handbook (7^th Edition):

Noor Mohamed, Noor Hisyam. “DEVELOPMENT AND CHARACTERIZATION OF HIGH STRENGTH CELLULOSIC NANOFIBER AND POLYVINYL ALCOHOL (PVA) COMPOSITE MATERIALS : 高強度セルロースナノ繊維/ポリビニールアルコール複合材料の開発およびパフォーマンスの評価.” 2017. Web. 15 Jan 2021.

Vancouver:

Noor Mohamed NH. DEVELOPMENT AND CHARACTERIZATION OF HIGH STRENGTH CELLULOSIC NANOFIBER AND POLYVINYL ALCOHOL (PVA) COMPOSITE MATERIALS : 高強度セルロースナノ繊維/ポリビニールアルコール複合材料の開発およびパフォーマンスの評価. [Internet] [Thesis]. Tokushima University / 徳島大学; 2017. [cited 2021 Jan 15]. Available from: http://repo.lib.tokushima-u.ac.jp/110136.

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

Council of Science Editors:

Noor Mohamed NH. DEVELOPMENT AND CHARACTERIZATION OF HIGH STRENGTH CELLULOSIC NANOFIBER AND POLYVINYL ALCOHOL (PVA) COMPOSITE MATERIALS : 高強度セルロースナノ繊維/ポリビニールアルコール複合材料の開発およびパフォーマンスの評価. [Thesis]. Tokushima University / 徳島大学; 2017. Available from: http://repo.lib.tokushima-u.ac.jp/110136

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

Universidade do Rio Grande do Norte

25. Silva, Dany Geraldo Kramer Cavalcanti e. Desenvolvimento de nanocompósito (hidroxiapatita/ poliuretano) pela gelação (gelling) de poli ( álcool vinílico) (PVA) para remoção de metais pesados .

Degree: 2013, Universidade do Rio Grande do Norte

URL: http://repositorio.ufrn.br/handle/123456789/15605

► Removing microcontaminants from effluents is a challenge today, because of its high cost and low efficiency, especially in the treatment of effluents containing heavy metals.… (more)

▼ Removing microcontaminants from effluents is a challenge today, because of its high cost and low efficiency, especially in the treatment of effluents containing heavy metals. An alternative that has emerged is the use of biodegradable nanocomposites, which exhibit good removal and recovery performances, in addition to its low cost. With this in mind, the present study aimed to develop and characterize a nanocomposite based on hydroxyapatite (HAP), polyurethane (PU) and polyvinyl alcohol (PVA) for removing heavy metals. Thus, the research was conducted in several steps: i)- Physico-chemical and microbiological hospital effluent characterization; ii)- Production of hydroxyapatite by aqueous precipitation technique, and their characterization; iii)- Production of the nanocomposite in which the hydroxyapatite was added to the polyurethane prepolymers and then the polyvinyl alcohol/hydroxyapatite film was produced; iv)- Polyvinyl composite without film PU/HAp was also produced in the proportions of 20 and 40% HAp; v)- The composites was characterized by the techniques of XRD, FTIR, SEM / EDS, BET, Zeta Potential and TGA; vi)- The sisal and coconut fibres were washed and dried for comparative tests of adsorption; vii)- Adsorption tests for evaluating the removal of heavy metals (nickel and cadmium). Initial screening adsorption capacity (HAp; PU/HAp - 20 and 40%; PU / HAp / PVA), kinetic studies of adsorption of Cd (II) by HAp; multifactorial design analysis (factorial design) for identifying the most important variables in the adsorption of Cd (II) by composite PU/HAp. Also comparative analysis of adsorption of Cd and Ni by composite PU/HAp were conducted, as well as comparative tests of adsorption of Cd (coconut fibre) and Ni (sisal fibre). It was possible to verify that the composite PU/HAp 40% showed better effectiveness for the removal of Cd (II) and Ni (II), above 80%, equivalent to the lignocellulosic fibre used and HAp produced. As main conclusion, it can be referred that the composite PU/HAp 40% is an effective adsorvent to wastewater treatment for heavy metal removal, with low cost and high efficiency Advisors/Committee Members: Ladchumananandasivam, Rasiah (advisor), CPF:18222161415 (advisor), http://lattes.cnpq.br/8553209522282182 (advisor), Quina, Margarida Maria João de (advisor), http://www.degois.pt/visualizador/curriculum.jsp?key=7906508732058961 (advisor), Ferreira, Licinio Manuel Gando de Azevedo (advisor), http://www.degois.pt/visualizador/curriculum.jsp?key=1812832255710564 (advisor).

Subjects/Keywords: Nanocompósito. Poliuretano. Metais pesados. Hidroxiapatita. Álcool polivinílico; Nanocomposite. Polyurethane. Heavy metals. Hydroxyapatite. Polyvinyl alcohol

Record Details Similar Records Cite « Share

❌

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

APA (6^th Edition):

Silva, D. G. K. C. e. (2013). Desenvolvimento de nanocompósito (hidroxiapatita/ poliuretano) pela gelação (gelling) de poli ( álcool vinílico) (PVA) para remoção de metais pesados . (Thesis). Universidade do Rio Grande do Norte. Retrieved from http://repositorio.ufrn.br/handle/123456789/15605

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):

Silva, Dany Geraldo Kramer Cavalcanti e. “Desenvolvimento de nanocompósito (hidroxiapatita/ poliuretano) pela gelação (gelling) de poli ( álcool vinílico) (PVA) para remoção de metais pesados .” 2013. Thesis, Universidade do Rio Grande do Norte. Accessed January 15, 2021. http://repositorio.ufrn.br/handle/123456789/15605.

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

MLA Handbook (7^th Edition):

Silva, Dany Geraldo Kramer Cavalcanti e. “Desenvolvimento de nanocompósito (hidroxiapatita/ poliuretano) pela gelação (gelling) de poli ( álcool vinílico) (PVA) para remoção de metais pesados .” 2013. Web. 15 Jan 2021.

Vancouver:

Silva DGKCe. Desenvolvimento de nanocompósito (hidroxiapatita/ poliuretano) pela gelação (gelling) de poli ( álcool vinílico) (PVA) para remoção de metais pesados . [Internet] [Thesis]. Universidade do Rio Grande do Norte; 2013. [cited 2021 Jan 15]. Available from: http://repositorio.ufrn.br/handle/123456789/15605.

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

Council of Science Editors:

Silva DGKCe. Desenvolvimento de nanocompósito (hidroxiapatita/ poliuretano) pela gelação (gelling) de poli ( álcool vinílico) (PVA) para remoção de metais pesados . [Thesis]. Universidade do Rio Grande do Norte; 2013. Available from: http://repositorio.ufrn.br/handle/123456789/15605

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

Universidade do Rio Grande do Norte

26. Silva, Dany Geraldo Kramer Cavalcanti e. Desenvolvimento de nanocompósito (hidroxiapatita/ poliuretano) pela gelação (gelling) de poli ( álcool vinílico) (PVA) para remoção de metais pesados .

Degree: 2013, Universidade do Rio Grande do Norte

URL: http://repositorio.ufrn.br/handle/123456789/15605

► Removing microcontaminants from effluents is a challenge today, because of its high cost and low efficiency, especially in the treatment of effluents containing heavy metals.… (more)

▼ Removing microcontaminants from effluents is a challenge today, because of its high cost and low efficiency, especially in the treatment of effluents containing heavy metals. An alternative that has emerged is the use of biodegradable nanocomposites, which exhibit good removal and recovery performances, in addition to its low cost. With this in mind, the present study aimed to develop and characterize a nanocomposite based on hydroxyapatite (HAP), polyurethane (PU) and polyvinyl alcohol (PVA) for removing heavy metals. Thus, the research was conducted in several steps: i)- Physico-chemical and microbiological hospital effluent characterization; ii)- Production of hydroxyapatite by aqueous precipitation technique, and their characterization; iii)- Production of the nanocomposite in which the hydroxyapatite was added to the polyurethane prepolymers and then the polyvinyl alcohol/hydroxyapatite film was produced; iv)- Polyvinyl composite without film PU/HAp was also produced in the proportions of 20 and 40% HAp; v)- The composites was characterized by the techniques of XRD, FTIR, SEM / EDS, BET, Zeta Potential and TGA; vi)- The sisal and coconut fibres were washed and dried for comparative tests of adsorption; vii)- Adsorption tests for evaluating the removal of heavy metals (nickel and cadmium). Initial screening adsorption capacity (HAp; PU/HAp - 20 and 40%; PU / HAp / PVA), kinetic studies of adsorption of Cd (II) by HAp; multifactorial design analysis (factorial design) for identifying the most important variables in the adsorption of Cd (II) by composite PU/HAp. Also comparative analysis of adsorption of Cd and Ni by composite PU/HAp were conducted, as well as comparative tests of adsorption of Cd (coconut fibre) and Ni (sisal fibre). It was possible to verify that the composite PU/HAp 40% showed better effectiveness for the removal of Cd (II) and Ni (II), above 80%, equivalent to the lignocellulosic fibre used and HAp produced. As main conclusion, it can be referred that the composite PU/HAp 40% is an effective adsorvent to wastewater treatment for heavy metal removal, with low cost and high efficiency Advisors/Committee Members: Ladchumananandasivam, Rasiah (advisor), http://lattes.cnpq.br/8553209522282182 (advisor), Quina, Margarida Maria João de (advisor), http://www.degois.pt/visualizador/curriculum.jsp?key=7906508732058961 (advisor), Ferreira, Licinio Manuel Gando de Azevedo (advisor), http://www.degois.pt/visualizador/curriculum.jsp?key=1812832255710564 (advisor).

Subjects/Keywords: Nanocompósito. Poliuretano. Metais pesados. Hidroxiapatita. Álcool polivinílico; Nanocomposite. Polyurethane. Heavy metals. Hydroxyapatite. Polyvinyl alcohol

Record Details Similar Records Cite « Share

❌

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

APA (6^th Edition):

Silva, D. G. K. C. e. (2013). Desenvolvimento de nanocompósito (hidroxiapatita/ poliuretano) pela gelação (gelling) de poli ( álcool vinílico) (PVA) para remoção de metais pesados . (Doctoral Dissertation). Universidade do Rio Grande do Norte. Retrieved from http://repositorio.ufrn.br/handle/123456789/15605

Chicago Manual of Style (16^th Edition):

Silva, Dany Geraldo Kramer Cavalcanti e. “Desenvolvimento de nanocompósito (hidroxiapatita/ poliuretano) pela gelação (gelling) de poli ( álcool vinílico) (PVA) para remoção de metais pesados .” 2013. Doctoral Dissertation, Universidade do Rio Grande do Norte. Accessed January 15, 2021. http://repositorio.ufrn.br/handle/123456789/15605.

MLA Handbook (7^th Edition):

Silva, Dany Geraldo Kramer Cavalcanti e. “Desenvolvimento de nanocompósito (hidroxiapatita/ poliuretano) pela gelação (gelling) de poli ( álcool vinílico) (PVA) para remoção de metais pesados .” 2013. Web. 15 Jan 2021.

Vancouver:

Silva DGKCe. Desenvolvimento de nanocompósito (hidroxiapatita/ poliuretano) pela gelação (gelling) de poli ( álcool vinílico) (PVA) para remoção de metais pesados . [Internet] [Doctoral dissertation]. Universidade do Rio Grande do Norte; 2013. [cited 2021 Jan 15]. Available from: http://repositorio.ufrn.br/handle/123456789/15605.

Council of Science Editors:

Silva DGKCe. Desenvolvimento de nanocompósito (hidroxiapatita/ poliuretano) pela gelação (gelling) de poli ( álcool vinílico) (PVA) para remoção de metais pesados . [Doctoral Dissertation]. Universidade do Rio Grande do Norte; 2013. Available from: http://repositorio.ufrn.br/handle/123456789/15605

Universidade do Rio Grande do Norte

27. Silva, Dany Geraldo Kramer Cavalcanti e. Desenvolvimento de nanocompósito (hidroxiapatita/ poliuretano) pela gelação (gelling) de poli ( álcool vinílico) (PVA) para remoção de metais pesados .

Degree: 2013, Universidade do Rio Grande do Norte

URL: http://repositorio.ufrn.br/handle/123456789/15605

► Removing microcontaminants from effluents is a challenge today, because of its high cost and low efficiency, especially in the treatment of effluents containing heavy metals.… (more)

▼ Removing microcontaminants from effluents is a challenge today, because of its high cost and low efficiency, especially in the treatment of effluents containing heavy metals. An alternative that has emerged is the use of biodegradable nanocomposites, which exhibit good removal and recovery performances, in addition to its low cost. With this in mind, the present study aimed to develop and characterize a nanocomposite based on hydroxyapatite (HAP), polyurethane (PU) and polyvinyl alcohol (PVA) for removing heavy metals. Thus, the research was conducted in several steps: i)- Physico-chemical and microbiological hospital effluent characterization; ii)- Production of hydroxyapatite by aqueous precipitation technique, and their characterization; iii)- Production of the nanocomposite in which the hydroxyapatite was added to the polyurethane prepolymers and then the polyvinyl alcohol/hydroxyapatite film was produced; iv)- Polyvinyl composite without film PU/HAp was also produced in the proportions of 20 and 40% HAp; v)- The composites was characterized by the techniques of XRD, FTIR, SEM / EDS, BET, Zeta Potential and TGA; vi)- The sisal and coconut fibres were washed and dried for comparative tests of adsorption; vii)- Adsorption tests for evaluating the removal of heavy metals (nickel and cadmium). Initial screening adsorption capacity (HAp; PU/HAp - 20 and 40%; PU / HAp / PVA), kinetic studies of adsorption of Cd (II) by HAp; multifactorial design analysis (factorial design) for identifying the most important variables in the adsorption of Cd (II) by composite PU/HAp. Also comparative analysis of adsorption of Cd and Ni by composite PU/HAp were conducted, as well as comparative tests of adsorption of Cd (coconut fibre) and Ni (sisal fibre). It was possible to verify that the composite PU/HAp 40% showed better effectiveness for the removal of Cd (II) and Ni (II), above 80%, equivalent to the lignocellulosic fibre used and HAp produced. As main conclusion, it can be referred that the composite PU/HAp 40% is an effective adsorvent to wastewater treatment for heavy metal removal, with low cost and high efficiency Advisors/Committee Members: Ladchumananandasivam, Rasiah (advisor), http://lattes.cnpq.br/8553209522282182 (advisor), Quina, Margarida Maria João de (advisor), http://www.degois.pt/visualizador/curriculum.jsp?key=7906508732058961 (advisor), Ferreira, Licinio Manuel Gando de Azevedo (advisor), http://www.degois.pt/visualizador/curriculum.jsp?key=1812832255710564 (advisor).

Subjects/Keywords: Nanocompósito. Poliuretano. Metais pesados. Hidroxiapatita. Álcool polivinílico; Nanocomposite. Polyurethane. Heavy metals. Hydroxyapatite. Polyvinyl alcohol

Record Details Similar Records Cite « Share

❌

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

APA (6^th Edition):

Silva, D. G. K. C. e. (2013). Desenvolvimento de nanocompósito (hidroxiapatita/ poliuretano) pela gelação (gelling) de poli ( álcool vinílico) (PVA) para remoção de metais pesados . (Doctoral Dissertation). Universidade do Rio Grande do Norte. Retrieved from http://repositorio.ufrn.br/handle/123456789/15605

Chicago Manual of Style (16^th Edition):

Silva, Dany Geraldo Kramer Cavalcanti e. “Desenvolvimento de nanocompósito (hidroxiapatita/ poliuretano) pela gelação (gelling) de poli ( álcool vinílico) (PVA) para remoção de metais pesados .” 2013. Doctoral Dissertation, Universidade do Rio Grande do Norte. Accessed January 15, 2021. http://repositorio.ufrn.br/handle/123456789/15605.

MLA Handbook (7^th Edition):

Silva, Dany Geraldo Kramer Cavalcanti e. “Desenvolvimento de nanocompósito (hidroxiapatita/ poliuretano) pela gelação (gelling) de poli ( álcool vinílico) (PVA) para remoção de metais pesados .” 2013. Web. 15 Jan 2021.

Vancouver:

Silva DGKCe. Desenvolvimento de nanocompósito (hidroxiapatita/ poliuretano) pela gelação (gelling) de poli ( álcool vinílico) (PVA) para remoção de metais pesados . [Internet] [Doctoral dissertation]. Universidade do Rio Grande do Norte; 2013. [cited 2021 Jan 15]. Available from: http://repositorio.ufrn.br/handle/123456789/15605.

Council of Science Editors:

Silva DGKCe. Desenvolvimento de nanocompósito (hidroxiapatita/ poliuretano) pela gelação (gelling) de poli ( álcool vinílico) (PVA) para remoção de metais pesados . [Doctoral Dissertation]. Universidade do Rio Grande do Norte; 2013. Available from: http://repositorio.ufrn.br/handle/123456789/15605

28. Bian, Yan. Durabilité des géosynthétiques en Poly(alcool vinylique) : Durability of Polyvinyl alcohol geosynthetics.

Degree: Docteur es, Mécanique-matériaux, 2019, Paris, ENSAM

URL: http://www.theses.fr/2019ENAM0024

►

Ce travail de thèse repose principalement sur l’étude de l’impact des facteurs environnementaux (température, humidité, pH) sur le vieillissement des fils de HT-PVAl destinés à… (more)

▼

Ce travail de thèse repose principalement sur l’étude de l’impact des facteurs environnementaux (température, humidité, pH) sur le vieillissement des fils de HT-PVAl destinés à la conception des bandes géosynthétiques. Les objectifs étaient d’identifier les produits, les mécanismes et les cinétiques de dégradation, et de déterminer l’impact du vieillissement sur la structure chimique, les propriétés physiques et mécaniques des fils. Il s’agissait aussi de proposer une méthodologie générale d’étude de la durabilité des produits géosynthétiques à base de fils de HT-PVAl. Ces derniers sont sujets à deux types de vieillissement : un vieillissement physique par absorption de l’humidité existante dans les sols, et un vieillissement chimique par exposition aux conditions physico-chimiques des sols. Pour mieux comprendre l’impact de chaque facteur (température, humidité, pH), des essais de vieillissement accélérés ont été réalisés dans trois distincts environnements : le vieillissement thermique dans l’air entre 70 et 120°C, le vieillissement humide entre 0 et 100 % d’humidité relative et entre 22 et 70°C, et le vieillissement chimique dans des solutions aqueuses acide (acide sulfurique, pH = 2,4) et alcaline (hydroxyde de sodium, pH = 12) entre 50 et 70°C. Les échantillons ont été caractérisés à différentes échelles structurales : moléculaire, macromoléculaire, morphologique et macroscopique. Cette approche multi-technique et multi-échelle a permis de déterminer les principaux paramètres régissant la cinétique de dégradation des fils de HT-PVAl dans des conditions de vieillissement proches de celles de l’application. De plus, elle a permis de mettre en évidence des traceurs de dégradation qui pourront être ensuite utilisés pour évaluer l’état de dégradation des produits de renforcement dans le temps.

This PhD thesis is mainly based on the study of the impact of environmental factors (temperature, humidity, pH) on the aging of HT-PVAl yarns for the design of geosynthetic strips. The objectives were to identify the degradation products, mechanisms and kinetics, and to determine the impact of aging on the chemical structure, the physical and mechanical properties of the yarns. This study was also aimed at proposing a general methodology for studying the durability of geosynthetic products based on HT-PVAl yarns. These latter are subject to two types of aging: physical aging by absorbing moisture existing in soils, and chemical aging by exposure to the physicochemical conditions of soil. In order to better understand the impact of each factor (temperature, humidity, pH), accelerated aging tests were done in three different environments: thermal aging in air between 70 and 120°C, humid aging between 0 and 100% relative humidity and between 22 and 70°C, and chemical aging in acidic (sulfuric acid, pH = 2.4) and alkaline (sodium hydroxide, pH = 12) aqueous solutions between 50 and 70°C. The samples were characterized at different structural scales: molecular, macromolecular, morphological and macroscopic scales. This…

Advisors/Committee Members: Colin, Xavier (thesis director), Aressy, Matthieu (thesis director).

Subjects/Keywords: Poly(alcool vinylique); Vieillissement; Ph; Oxydation; Geosynthétiques; PVAl; Polyvinyl alcohol; Aging; Ph; Oxidation; Geosynthetics; PVAl

Record Details Similar Records Cite « Share

❌

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

APA (6^th Edition):

Bian, Y. (2019). Durabilité des géosynthétiques en Poly(alcool vinylique) : Durability of Polyvinyl alcohol geosynthetics. (Doctoral Dissertation). Paris, ENSAM. Retrieved from http://www.theses.fr/2019ENAM0024

Chicago Manual of Style (16^th Edition):

Bian, Yan. “Durabilité des géosynthétiques en Poly(alcool vinylique) : Durability of Polyvinyl alcohol geosynthetics.” 2019. Doctoral Dissertation, Paris, ENSAM. Accessed January 15, 2021. http://www.theses.fr/2019ENAM0024.

MLA Handbook (7^th Edition):

Bian, Yan. “Durabilité des géosynthétiques en Poly(alcool vinylique) : Durability of Polyvinyl alcohol geosynthetics.” 2019. Web. 15 Jan 2021.

Vancouver:

Bian Y. Durabilité des géosynthétiques en Poly(alcool vinylique) : Durability of Polyvinyl alcohol geosynthetics. [Internet] [Doctoral dissertation]. Paris, ENSAM; 2019. [cited 2021 Jan 15]. Available from: http://www.theses.fr/2019ENAM0024.

Council of Science Editors:

Bian Y. Durabilité des géosynthétiques en Poly(alcool vinylique) : Durability of Polyvinyl alcohol geosynthetics. [Doctoral Dissertation]. Paris, ENSAM; 2019. Available from: http://www.theses.fr/2019ENAM0024

Brno University of Technology

29. Gajdová, Barbora. Stanovení aditiv ve vícesložkovém systému pro elektrospinnig: Determination of additives in multicomponent electrospinning systems.

Degree: 2019, Brno University of Technology

URL: http://hdl.handle.net/11012/38671

► This bachelor thesis deals with methods of producing nanofibres from mixture of different polymers. Different methods of preparation and production nanofibres by 4SPIN® are described… (more)

Subjects/Keywords: kyselina hyaluronová; nanovlákna; aditiva; polyvinylalkohol; elektrospinning; hyaluronic acid; nanofibres; additives; polyvinyl alcohol; electrospinning

Record Details Similar Records Cite « Share

❌

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

APA (6^th Edition):

Gajdová, B. (2019). Stanovení aditiv ve vícesložkovém systému pro elektrospinnig: Determination of additives in multicomponent electrospinning systems. (Thesis). Brno University of Technology. Retrieved from http://hdl.handle.net/11012/38671

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):

Gajdová, Barbora. “Stanovení aditiv ve vícesložkovém systému pro elektrospinnig: Determination of additives in multicomponent electrospinning systems.” 2019. Thesis, Brno University of Technology. Accessed January 15, 2021. http://hdl.handle.net/11012/38671.

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

MLA Handbook (7^th Edition):

Gajdová, Barbora. “Stanovení aditiv ve vícesložkovém systému pro elektrospinnig: Determination of additives in multicomponent electrospinning systems.” 2019. Web. 15 Jan 2021.

Vancouver:

Gajdová B. Stanovení aditiv ve vícesložkovém systému pro elektrospinnig: Determination of additives in multicomponent electrospinning systems. [Internet] [Thesis]. Brno University of Technology; 2019. [cited 2021 Jan 15]. Available from: http://hdl.handle.net/11012/38671.

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

Council of Science Editors:

Gajdová B. Stanovení aditiv ve vícesložkovém systému pro elektrospinnig: Determination of additives in multicomponent electrospinning systems. [Thesis]. Brno University of Technology; 2019. Available from: http://hdl.handle.net/11012/38671

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

Brno University of Technology

30. Másilko, Jiří. Syntéza vysokopevnostních kompozitů na bázi anorganického cementu a polymeru: Synthesis of High-Strength Composites Based on Inorganic Cement and Polymer.

Degree: 2018, Brno University of Technology

URL: http://hdl.handle.net/11012/17590

► The subject of the doctoral thesis is the study of moisture resistance of macro-defect-free (MDF) composites based on calcium-aluminate cement and polyvinylalcohol used as polymer.… (more)

Subjects/Keywords: macro-defect-free; hlinitanový cement; polyvinyl alkohol; odolnost proti vlhkosti; zesíťování; macro-defect-free; aluminate cement; polyvinyl alcohol; moisture resistance; cross-linking

Record Details Similar Records Cite « Share

❌

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

APA (6^th Edition):

Másilko, J. (2018). Syntéza vysokopevnostních kompozitů na bázi anorganického cementu a polymeru: Synthesis of High-Strength Composites Based on Inorganic Cement and Polymer. (Thesis). Brno University of Technology. Retrieved from http://hdl.handle.net/11012/17590

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):

Másilko, Jiří. “Syntéza vysokopevnostních kompozitů na bázi anorganického cementu a polymeru: Synthesis of High-Strength Composites Based on Inorganic Cement and Polymer.” 2018. Thesis, Brno University of Technology. Accessed January 15, 2021. http://hdl.handle.net/11012/17590.

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

MLA Handbook (7^th Edition):

Másilko, Jiří. “Syntéza vysokopevnostních kompozitů na bázi anorganického cementu a polymeru: Synthesis of High-Strength Composites Based on Inorganic Cement and Polymer.” 2018. Web. 15 Jan 2021.

Vancouver:

Másilko J. Syntéza vysokopevnostních kompozitů na bázi anorganického cementu a polymeru: Synthesis of High-Strength Composites Based on Inorganic Cement and Polymer. [Internet] [Thesis]. Brno University of Technology; 2018. [cited 2021 Jan 15]. Available from: http://hdl.handle.net/11012/17590.

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

Council of Science Editors:

Másilko J. Syntéza vysokopevnostních kompozitů na bázi anorganického cementu a polymeru: Synthesis of High-Strength Composites Based on Inorganic Cement and Polymer. [Thesis]. Brno University of Technology; 2018. Available from: http://hdl.handle.net/11012/17590

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

		in
And / Or
		in
And / Or
		in
And / Or
		in

Open Access Theses and Dissertations