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Dissertations / Theses on the topic 'Poly(vinyl alcohol) PVA hydrogels'

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Published: 4 June 2021

Last updated: 1 February 2022

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1

Hsu, Hsingching. "Ultrasonic wave propagation in poly(vinyl alcohol) and articular cartilage." Thesis, Available online, Georgia Institute of Technology, 2005:, 2004. http://etd.gatech.edu/theses/available/etd-06292004-151052/unrestricted/hsu%5Fhsingching%5Fc%5F200407%5Fms.pdf.

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Thesis (M.S.)--School of Mechanical Engineering, Georgia Institute of Technology, 2005. Directed by Marc Levenston.<br>Marc Levenston, Committee Co-Chair ; Yves Berthelot, Committee Co-Chair ; Robert Guldberg, Committee Member. Includes bibliographical references.

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2

Liang, Chun Ying. "Poly(vinyl alcohol) PVA hydrogel characterization as a potential nucleus pulposus replacement candidate." Thesis, McGill University, 2008. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=19277.

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Chronic lower back pain is a clinical manifestation of vertebral disc degeneration. An emerging technique, nucleoplasty, aims to target early stages of disc degeneration. It is envisioned to inject a liquid-state polymer, poly(vinyl alcohol) hydrogels, into the nuclear cavity and allowed to cure in-situ. Two formulations of poly(vinyl alcohol) hydrogels were investigated for its suitability as an injectable polymer. Therefore, its swelling ability, stiffness, required extrusion pressures and temperature dependent curing ra

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3

Spindura, Jillian. "The response of poly (vinyl alcohol) to humidity." Thesis, University of Oxford, 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.365748.

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4

Cha, Won-ill. "Physicochemical studies on poly (vinyl alcohol) hydrogels." Kyoto University, 1994. http://hdl.handle.net/2433/168897.

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本文データは平成22年度国立国会図書館の学位論文(博士)のデジタル化実施により作成された画像ファイルを基にpdf変換したものである<br>Kyoto University (京都大学)<br>0048<br>新制・論文博士<br>博士(工学)<br>乙第8528号<br>論工博第2849号<br>新制||工||958(附属図書館)<br>UT51-94-J257<br>(主査)教授筏義人, 教授升田利史郎, 教授池内健<br>学位規則第4条第2項該当

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5

Croot, Robert Arthur. "The characterisation and adsorption of vinyl alcohol vinyl acetate copolymers." Thesis, University of Bristol, 1990. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.303767.

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6

Cauich-Rodriguez, Juan Valerio. "Hydrogels based on poly(vinyl alcohol-vinyl acetate) blends for biomedical applications." Thesis, Queen Mary, University of London, 1997. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.267577.

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7

Cheng, Zhihan. "MECHANICALLY STRONG/ LOW FLAMMABILITY POLY (VINYL ALCOHOL) AEROGELS." Case Western Reserve University School of Graduate Studies / OhioLINK, 2019. http://rave.ohiolink.edu/etdc/view?acc_num=case155266644473611.

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8

Bernhard, Kathleen C. "Methods to create and characteristics of porous poly(vinyl) alcohol for the purpose of facial implants." Thesis, Georgia Institute of Technology, 2014. http://hdl.handle.net/1853/53112.

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Facial implants are becoming more common in America and across the world. In the United States last year, over 260,000 augmentation and reconstruction surgeries were performed on facial cartilage areas, while over two million soft tissue fillers were administered. The current implants on the market, though, are deficient in three major areas: they are too rigid, susceptible to migration, and require a large incision. Alternatively, dermal fillers lack shape and biodegrade too quickly. Poly(vinyl) alcohol (PVA) cryogel is a promising hydrogel alternative due to its softness, durable nature

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9

Vidović, Elvira. "The development of bioabsorbable hydrogels on the basis of polyester grafted poly(vinyl alcohol)." [S.l.] : [s.n.], 2006. http://deposit.ddb.de/cgi-bin/dokserv?idn=982593821.

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10

Koch, Meredith Ericson. "Mechanical Optimization Of Poly(vinyl Alcohol) Cryogels To Activate Osteochondral Mechanotransduction Pathways." ScholarWorks @ UVM, 2014. http://scholarworks.uvm.edu/graddis/305.

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Tissue engineering and regenerative medicine have emerged as viable approaches to repairing osteochondral tissue damage, especially with the implementation of biomaterials and mesenchymal stem cells (MSCs). Poly(vinyl alcohol) (PVA) is a synthetic and non-biodegradable polymer that has received attention as a tissue engineering scaffold and cartilage replacement due to its inherent viscoelasticity and biocompatibility. This work investigated the use of mechanical cues to trigger mechanotransduction pathways and thereby guide human MSCs towards a desired differentiation lineage. PVA scaffolds w

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11

Chirowodza, Helen. "Synthesis and characterization of cationically and anionically modified poly(vinyl alcohol) microfibrils." Thesis, Stellenbosch : University of Stellenbosch, 2009. http://hdl.handle.net/10019.1/2184.

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Thesis (MSc (Chemistry and Polymer Science))--University of Stellenbosch, 2009.<br>In papermaking, the addition of filler can be detrimental to the properties of the resulting paper hence the use of additives that enhance paper properties are of paramount importance. Syndiotacticity rich poly(vinyl alcohol) (PVA) microfibrils were prepared for use as filler retention aids. They were prepared via in situ fibrillation during the saponification of high molecular weight poly(vinyl pivalate). The resulting fibers had high thermal stability and crystalline melting temperature. They were not ful

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12

Rashid, Mohammed R. A. "Image Contrast Enhancement using Poly Vinyl Alcohol Microbubble Response to High MI Ultrasound." Thesis, KTH, Skolan för kemi, bioteknologi och hälsa (CBH), 2018. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-232976.

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The induced rupturing of Poly Vinyl Alcohol (PVA) microbubbles with high mechanical index (MI)ultrasound beam is used in multiple medical application such as drug delivery, image contrastenhancement and perfusion imaging.In this work, Triggered imaging technique with subtraction algorithm is used to enhance themicrobubble’s (MB) contrast over tissue (CTR). The technique is performed by rupturing MBwith one destruction wave sequence followed by 100 B-mode imaging pulse sequences. Theimages obtained are then subtracted by a base image that is selected after the destruction pulse[1].The result of

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Simões, Maira Martins de Souza Godoy. "Revestimento de stents com filmes de PVA eluidores de S-nitrosoglutationa." [s.n.], 2006. http://repositorio.unicamp.br/jspui/handle/REPOSIP/248516.

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Orientador: Marcelo Ganzarolli de Oliveira<br>Dissertação (mestrado) - Universidade Estadual de Campinas, Instituto de Quimica<br>Made available in DSpace on 2018-08-08T04:10:36Z (GMT). No. of bitstreams: 1 Simoes_MairaMartinsdeSouzaGodoy_M.pdf: 3432819 bytes, checksum: d31e48f8632d109b7dba6dbd370c37f6 (MD5) Previous issue date: 2006<br>Resumo: Stents são malhas metálicas expansíveis usadas em procedimentos de angioplastia, para a desobstrução das artérias coronárias. Atualmente há um grande interesse na obtenção de stents revestidos com matrizes poliméricas eluidoras de drogas que impeçam a

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Lange, Hanna. "Emulsion polymerization of vinyl acetate with renewable raw materials as protective colloids." Thesis, KTH, Skolan för kemivetenskap (CHE), 2011. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-41019.

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Emulsion polymerizations of vinyl acetate (VAc) were performed by fully or partially replacing poly(vinyl alcohol) (PVA) with renewable materials as protective colloids or by adding renewable materials, as additives or fillers, to the emulsions during or after polymerization. The purpose of the study was to increase the amount of renewable materials in the emulsion. A total of 19 emulsions were synthesized. Different recipes were used for the synthesis. The following renewable materials were studied; hydroxyethyl cellulose (HEC) with different molecular weights, starch and proteins. HEC and st

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Ozaki, Salete Kiyoka. "Compósitos biodegradáveis de resíduos de madeira - PVA modificado por anidrido ftálico." Universidade de São Paulo, 2004. http://www.teses.usp.br/teses/disponiveis/88/88131/tde-25112014-165852/.

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Os polímeros sintéticos compõem cerca de 20% do lixo urbano no Brasil. Além da não biodegradabilidade, formam uma camada impermeabilizante que impede a passagem de líquidos e gases originados no apodrecimento dos detritos, retardando a estabilização da matéria orgânica. A exploração da madeira produz uma grande quantidade de rejeitos que não são inteiramente aproveitados para gerar energia ou outros produtos, e acarreta sérios problemas ambientais. A finalidade deste trabalho é a produção de compósitos biodegradáveis reunindo rejeitos de madeira e um polímero biodegradável - o poli (álcool vin

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Dawood, Abdulsattar Y. "Study on the Effect of γ-Ray Irradiation and Oxidation Pretreatment on the Pyrolysis of Polypropylene (PP) and Poly (Vinyl Alcohol) (PVA)". 京都大学 (Kyoto University), 2002. http://hdl.handle.net/2433/149827.

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Simões, Maira Martins de Souza Godoy. "Filmes sólidos de PVA eluidores de GSNO para aplicações tópicas e para o revestimento de stents." [s.n.], 2011. http://repositorio.unicamp.br/jspui/handle/REPOSIP/248520.

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Orientador: Marcelo Ganzarolli de Oliveira<br>Tese (doutorado) - Universidade Estadual de Campinas, Instituto de Química<br>Made available in DSpace on 2018-08-19T16:07:51Z (GMT). No. of bitstreams: 1 Simoes_MairaMartinsdeSouzaGodoy_D.pdf: 6359705 bytes, checksum: 9fb71ed44e3423b6b245f6b70134e270 (MD5) Previous issue date: 2011<br>Resumo: O Poli(álcool vinílico) (PVA) é polímero biocompatível que pode ser usado como matriz para a incorporação de S-nitrosoglutationa (GSNO), que é uma molécula endógena que exerce todas as funções bioquímicas do óxido nítrico (NO). Os principais objetivos deste

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18

Song, Gao. "Matrix manipulation to study ECC behaviour." Thesis, Stellenbosch : University of Stellenbosch, 2005. http://hdl.handle.net/10019.1/4647.

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Thesis (MScEng (Civil Engineering))--University of Stellenbosch, 2005.<br>192 leaves on CD format, preliminary i-xii pages and numbered pages 1-135. Includes bibliography, list of figures and tables.<br>ENGLISH ABSTRACT: As a fibre reinforced material, engineered cementitious composite (ECC) has tough, strain-hardening behaviour in tension despite containing low volumes of fibres. This property can be brought about by developments in fibre, matrix and interfacial properties. Poly Vinyl Alcohol (PVA) fibre has been developed in recent years for ECC, due to its high tensile strength and elastici

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Silva, Vanessa Bezerra da. "Avaliação da potencialidade do uso de hidrogéis poliméricos na terapeutica de leishmaniose cutânea." Universidade Federal de São Carlos, 2015. https://repositorio.ufscar.br/handle/ufscar/7635.

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Submitted by Daniele Amaral (daniee_ni@hotmail.com) on 2016-09-21T20:58:24Z No. of bitstreams: 1 DissVBS.pdf: 1740289 bytes, checksum: f0f9dfa6182cf0c0dfe8b39ff3cda89c (MD5)<br>Approved for entry into archive by Marina Freitas (marinapf@ufscar.br) on 2016-10-04T18:07:59Z (GMT) No. of bitstreams: 1 DissVBS.pdf: 1740289 bytes, checksum: f0f9dfa6182cf0c0dfe8b39ff3cda89c (MD5)<br>Approved for entry into archive by Marina Freitas (marinapf@ufscar.br) on 2016-10-04T18:08:06Z (GMT) No. of bitstreams: 1 DissVBS.pdf: 1740289 bytes, checksum: f0f9dfa6182cf0c0dfe8b39ff3cda89c (MD5)<br>Made available

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永正, 邵., and Yongzheng Shao. "Study on the effects of matrix properties on the mechanical properties of carbon fiber reinforced plastic composites." Thesis, https://doors.doshisha.ac.jp/opac/opac_link/bibid/BB12902982/?lang=0, 2015. https://doors.doshisha.ac.jp/opac/opac_link/bibid/BB12902982/?lang=0.

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It was found that a significant improvement of mechanical properties of CFRPs can be achieved by the adjustment of the matrix properties such as toughness and CF/matrix adhesion via the chemical modification, as well as the physical modification by a small amount of cheap and environment-friendly nano fibers. Based on investigation of fracture mechanisms at macro/micro scale, the effects of matrix properties and nano fiber on the mechanical properties of CFRP have been discussed. Subsequently, the relationship has been characterized by a numerical model to show how to modulate the parameters o

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21

Chen, Mei-Chiung, and 陳美瓊. "Viscoelastic Behavior and Interfacial Thermodynamics of Poly(vinyl alcohol-g-sodium styrenesulfonate)[PVA-g-SSS] Hydrogels." Thesis, 1999. http://ndltd.ncl.edu.tw/handle/36896105666856754218.

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碩士<br>國立臺灣科技大學<br>纖維及高分子工程研究所<br>87<br>Abstract (Part I) PVA[Poly(vinyl-aclohol)] was grafting-copolymerized with SSS(sodium styrenesulfonate) and ammonium cerium(IV) sulfate at 60℃. The SSS content of various copolymers were analyzed with UV-VIS spectroscopy. The water content in hydrogels increases with SSS grafting. The tensile measurements result in the elastic modulus of gels at various temperatures, which yields the crosslink density of hydrogels and Flory-Huggins interaction parameters (χ). Theχparameters decreases with temperature and grafting ratio, and the enthalpic compon

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22

Tseng, Chin-Hsin, and 曾志新. "The diffusion and adsorption of drugs in Poly(vinyl alcohol-g-sodium styrene sulfonate)[PVA-g-SSS] Hydrogels." Thesis, 2004. http://ndltd.ncl.edu.tw/handle/60513088143102297766.

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碩士<br>國立臺灣科技大學<br>高分子工程系<br>92<br>Polyvinyl alcohol gels crosslinked with sodium styrenesulfonate（SSS） with SSS grafting ratio from 1.3×10-3 to 3.5×10-3 were prepared and drugs（Benzoic acid , Vitamin K3 and Caffeine）permeation and diffusion through gels were determined. The mesh size of gels were determined with hydrogel water contents（swelling）and elasticity data. The diffusion coefficients increase with swelling, and the solubility increases with drug size. Diffusion coefficient and solubility were presented in terms of the ratio of drug diameter to that of mesh size. The diffusion is a cont

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23

Zheng, Zhen-Bang, and 丁振邦. "Static and Dynamic Characterization of Poly(vinyl alcohol-g-sodium styrenesulfonate)[PVA-g-SSS]Hydrogels-Swelling, Elastic and Photophysical Properties." Thesis, 1996. http://ndltd.ncl.edu.tw/handle/39342830116370097155.

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24

Meng, Y., Philip D. Coates, and Peter C. Twigg. "In Situ Cross-Linking of Poly(vinyl alcohol)/Graphene Oxide–Polyethylene Glycol Nanocomposite Hydrogels as Artificial Cartilage Replacement: Intercalation Structure, Unconfined Compressive Behavior, and Biotribological Behaviors." 2018. http://hdl.handle.net/10454/17004.

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Yes<br>Poly(vinyl alcohol) (PVA)/graphene oxide (GO) nanocomposite hydrogel as artificial cartilage replacement was prepared via freezing/thawing method by introducing polyethylene glycol (PEG). Efficient grafting of PVA molecules onto GO surface was realized by formation of hydrogen bonding, resulting in exfoliation and uniform distribution of GO in PVA matrix. By introduction of appropriate content of GO, the increased crystalline regions of PVA and the formation of GO centered second network structure led to the increase of the storage modulus and effective cross-linking density. And theref

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Choudhury, Nurul Alam. "Studies On Polymer Hydrogel Electrolytes For Application In Electrochemical Capacitors And Direct Borohydride Fuel Cells." Thesis, 2008. http://hdl.handle.net/2005/790.

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In recent years, electrochemical capacitors have emerged as devices with the potential to enable major advances in electrical energy storage. Electrochemical capacitors (ECs) are akin to conventional capacitors but employ higher surface-area electrodes and thinner dielectrics to achieve larger capacitances. This helps ECs to attain energy densities greater than those of conventional capacitors and power densities greater than those of batteries. Akin to conventional capacitors, ECs also have high cycle-lives and can be charged and discharged rapidly. But ECs are yet to match the energy densiti

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Wang, Tzu-Fang, and 王姿方. "Self-Assembly and Properties of Poly(acrylic acid)-block-poly(vinyl alcohol) (PAA-b-PVA) Block Copolymer and Nanostructured Poly(vinyl alcohol)-Dodecylbenzenesulfonic Acid Complexes." Thesis, 2017. http://ndltd.ncl.edu.tw/handle/nwvb8g.

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碩士<br>國立清華大學<br>化學工程學系所<br>105<br>This thesis is centered on the self-assembly behavior of nanostructured poly(vinyl alcohol) (PVA) constructed by block copolymer and polymer-surfactant complex. It is further divided into two parts. The first part discusses the self-assembly behavior of PAA-b-PVA block copolymer and PAA/PVA blends. The tensile properties of the block copolymer films were in general much better than those of the corresponding blend, where the maximum fractural tensile stress and strain attained were 27.3 MPa and 641 %. The FTIR study indicated that the extent of hydrogen bondin

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Tsai, Meng-Shya, and 蔡孟霞. "Hydration and Water Relaxation in Modified Poly(vinyl alcohol) and Chitosan Hydrogels." Thesis, 2000. http://ndltd.ncl.edu.tw/handle/00081257043180571604.

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碩士<br>國立臺灣科技大學<br>纖維及高分子工程研究所<br>88<br>Abstract (Part Ⅰ) The study utilizes DSC to reveal the information about bound 、interface and free water in hydrogels made up of poly(vinyl alcohol) grafted with sodium styrenesulfonate (SSS).DSC thermograms for gels show two water melting peaks around 0℃, where the one at the lower temperature is attributed to the interfacial state, and another to the free water. The above two melting peaks come closer with the higher water content in gels and higher SSS grafting. Pulsed NMR gives the temperature dependence of spin-lattice relaxation time (T1)

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28

Shahbuddin, M., A. J. Bullock, S. MacNeil, and Stephen Rimmer. "Glucomannan-poly(N-vinyl pyrrolidinone) bicomponent hydrogels for wound healing." 2014. http://hdl.handle.net/10454/10531.

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No<br>Polysaccharides interact with cells in ways that can be conducive to wound healing. We have recently reported that konjac glucomannan (KGM) which is comprised of D-mannose and D-glucose linked by beta-1,4 glycosidic chains, stimulates fibroblast proliferation. The aim of this study was to produce a range of crosslinked KGMs and bicomponent KGM containing hydrogels and to examine their potential for wound healing. Two types of KGM hydrogel were synthesized, biodegradable from crosslinked KGM and non-biodegradable by forming semi-IPNs and graft-conetworks with a second synthetic component,

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Knaapila, M., Beverly Stewart, T. Costa, et al. "Incorporation of a Cationic Conjugated Polyelectrolyte CPE within an Aqueous Poly(vinyl alcohol) Sol." 2016. http://hdl.handle.net/10454/17085.

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No<br>We report on a multiscale polymer-within-polymer structure of the cationic conjugated polyelectrolyte poly{[9,9-bis(6′-N,N,N-trimethylammonium)hexyl]fluorene–phenylene} (HTMA-PFP) in aqueous poly(vinyl alcohol) (PVA) sol. Molecular dynamics simulations and small-angle neutron scattering (SANS) data show that HTMA-PFP forms aggregates in water but becomes entangled by PVA (with a 1:1 molar ratio of HTMA-PFP to PVA) and eventually immersed in PVA clusters (with the ratio 1:4). This is attributed to the hydrophobic–hydrophilic balance. Contrast variation data with regular and deuterated PVA

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Huang, Mei-hua, та 黃美華. "Preparation and properties of glucan/ poly(vinyl alcohol) and sodium alginate/poly(γ-glutamic acid) blend hydrogels". Thesis, 2009. http://ndltd.ncl.edu.tw/handle/47540182313684888486.

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博士<br>國立臺灣科技大學<br>高分子系<br>97<br>Two blend hydrogels, glucan/poly (vinyl alcohol) and sodium alginate/calcium poly(γ-glutamate)were prepared. The properties of the resulting hydrogels were evaluated through hydrophilicity tests, mechanical tests, and biocompatibility. This research was divided into two parts. In the first part, aqueous mixture of β-glucan and poly(vinyl alcohol) (PVA) was cast into films and dried at 110°C without chemical crosslinking. The content of glucan in the film varied from 7% to 50%. The hydrophilicity of the resulting films was evaluated with swelling tests, wet a

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Liu, Chien-Pan, and 劉建邦. "Novel proton exchange membrane based on crosslinked poly(vinyl alcohol) (PVA) for direct methanol fuel cells (DMFCs)." Thesis, 2007. http://ndltd.ncl.edu.tw/handle/52058653501642080623.

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碩士<br>臺灣大學<br>化學工程學研究所<br>95<br>Direct Methanol Fuel Cells (DMFCs) are promising new power sources for vehicles and protable devices. It’s significant challenge to develop proton exchange membranes (PEMs) possing both desired proton conductivity and low methanol permeability for the DMFCs. PEMs currently used in DMFC are perfluorinated polymers such as Nafion®. Even though such membranes have demonstrated good performances and long-term stability, their high cost and methanol crossover makes them unpractical for large-scale production. In this research, I describe two kinds of membranes and di

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Liu, Chien-Pan. "Novel proton exchange membrane based on crosslinked poly(vinyl alcohol) (PVA) for direct methanol fuel cells (DMFCs)." 2007. http://www.cetd.com.tw/ec/thesisdetail.aspx?etdun=U0001-3007200702120600.

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Vidović, Elvira [Verfasser]. "The development of bioabsorbable hydrogels on the basis of polyester grafted poly(vinyl alcohol) / vorgelegt von Elvira Vidović." 2006. http://d-nb.info/982593821/34.

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Hunt, Benjamin Daniel. "Knee simulation, creep, and friction tests of poly(vinyl alcohol) hydrogels manufactured using injection molding and solution casting." 2006. http://etd.nd.edu/ETD-db/theses/available/etd-07182006-142516/.

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Thesis (M.S.M.E.)--University of Notre Dame, 2006.<br>Thesis directed by Edmundo Corona for the Department of Aerospace and Mechanical Engineering. "July 2006." Includes bibliographical references (leaves 55-57).

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"Design, Fabrication and Characterization of PVA/Nanocarbon Composite Fibers." Master's thesis, 2018. http://hdl.handle.net/2286/R.I.51759.

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abstract: Polymer fibers have broad applications in wearable electronics, bulletproof vests, batteries, fuel cells, filters, electrodes, conductive wires, and biomedical materials. Polymer fibers display light density and flexibility but are mostly weak and compliant. The ceramic, metallic, and carbon nanoparticles have been frequently included in polymers for fabricating continuous, durable, and functional composite fibers. Nanoparticles display large specific areas, low defect density and can transfer their superior properties to polymer matrices. The main focus of this thesis is to design,

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Arantes, Sara Cristina Vintena. "Filmes baseados em PVA e grafeno para aplicações biomédicas." Master's thesis, 2018. http://hdl.handle.net/1822/55235.

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Dissertação de mestrado integrado em Engenharia de Polímeros<br>A aplicação de cargas em polímeros, tais como grafite, nanotubos de carbono, fulerenos e mais recentemente o grafeno, tem atraído a atenção de investigadores que procuram a produção de materiais compósitos com propriedades especiais. Para melhorar as propriedades, sobretudo mecânicas, elétricas e térmicas, dos compósitos tem sido estudada a incorporação destas em polímeros e a sua influência sobre as propriedades dos compósitos resultantes. Neste trabalho estudou-se a influência da incorporação de grafite e grafeno em poli(álcool

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Huang, Chia Sheng, and 黃家聖. "Interpenetrating network membranes of poly (2-hydroxylethyl meth-acrylate) (poly HEMA) and poly (vinyl alcohol) (PVA) in various ratios were prepared by UV radiation and treated with glutaraldehyde (GA). From the spectral change of FTIR, the hydroxyl grou." Thesis, 2005. http://ndltd.ncl.edu.tw/handle/33056050865582555044.

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碩士<br>長庚大學<br>化工與材料工程研究所<br>93<br>Interpenetrating network membranes of poly (2-hydroxylethyl meth- acrylate) (poly HEMA) and poly (vinyl alcohol) (PVA) in various ratios were prepared by UV radiation and treated with glutaraldehyde (GA). From the spectral change of FTIR, the hydroxyl groups disappeared and an acetal ring and ether linkage were formed for the reaction between the hydroxyl groups of PVA and GA. From the stress-strain curve, it was found that the tensile strength and elongation increased with PVA content on the PVA / poly (HEMA) membranes. After crosslinking with GA, the membran

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Sousa, Sylvia Fernandes. "Membranas de base PVA mais eficientes para a captura e separação de gases." Master's thesis, 2017. http://hdl.handle.net/10316/82974.

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Dissertação de Mestrado Integrado em Engenharia Química apresentada à Faculdade de Ciências e Tecnologia<br>Nos últimos anos uma crescente preocupação ambiental tem guiado parte da investigação científica no sentido de desenvolver soluções mais eficientes e económicas para a captura, separação e armazenamento de dióxido de carbono (CO2). Neste contexto e de entre as tecnologias que mais têm crescido nestes últimos anos, os processos de separação seletiva de CO2 através de membranas de base polimérica ou compósita, têm-se vindo a destacar, principalmente devido à sua versatilidade, caráter limp

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(6620462), Eduard Andres Caicedo Casso. "SHEAR RHEOMETRY PROTOCOLS TO ADVANCE THE DEVELOPMENT OF MICROSTRUCTURED FLUIDS." Thesis, 2019.

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<p></p><p>This doctoral dissertation takes the reader through a journey where applied shear rheology and flow-velocimetry are used to understand the mesoscopic factors that control the flow behavior of three microstructured fluids. Three individual protocols that measure relative physical and mechanical properties of the flow are developed. Each protocol aims to advance the particular transformation of novel soft materials into a commercial product converging in the demonstration of the real the chemical, physical and thermodynamical factors that could potentially drive their successful transf

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