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Dissertations / Theses on the topic 'PVA Nanocomposite'

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Published: 7 September 2023

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1

Busu, Alice. "Development of PVA/PDA nanocomposite membranes for CO2 capture." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2020.

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In this project, composite membranes containing nanoparticles of polydopamine PDA (dopamine polymer) will be manufactured and characterized in view of their use for the separation of CO2. Polysulfone will be used as a polymer matrix support while poly(vinyilalcohol) has been chosen as selective layer material. The work will first focus on the optimization of the manufacturing parameters of nano composite membranes and then on the influence of the integration of PDA nanoparticles in the polymeric support at different concentrations. The final objective is to test the material properties, with
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2

Coskun, Temmuz. "Investigating solid-state supercapacitors constructed with PVA/CNT nanocomposite electrolytes." Thesis, Wichita State University, 2014. http://hdl.handle.net/10057/10951.

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The search for alternative energy generation methods requires development for new energy storage methods as well. The ability to use nanotechnology to achieve high surface area, which is correlated to increased energy storage, brought advancements in supercapacitor applications. Supercapacitors have the potential to charge and discharge quickly and hold as much energy as batteries and other chemical storage devices. By having a completely solid-state supercapacitor, problems with leakage and decay could be avoided. Supercapacitors were assembled from electrodes made by reducing graphene oxide
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3

Gaume, Julien. "Etude du photovieillissement de matériaux nanocomposites pour l'encapsulation de cellules solaires organiques." Thesis, Clermont-Ferrand 2, 2011. http://www.theses.fr/2011CLF22173.

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Ce travail est consacré à l‟étude de la stabilité photochimique de nanocomposites polymère / argile en vue de leur insertion dans un système multicouche organique / inorganique pour l‟encapsulation des cellules solaires organiques. L‟objectif est d‟obtenir des films de nanocomposites polymère / argile flexibles, transparents, pouvant être mis en oeuvre par voie liquide, et photochimiquement stables. Dans une première partie, la caractérisation de nanocomposites à base d‟alcool polyvinylique (PVA) a montré leur aptitude à être insérés dans un système multicouche, notamment en ce qui concerne le
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Mabrouk, Mohamed Mostafa. "Preparation of PVA / Bioactive Glass nanocomposite scaffolds : in vitro studies for applications as biomaterials : association with active molecule." Thesis, Rennes 1, 2014. http://www.theses.fr/2014REN1S063/document.

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Le Poly Vinyl Alcohol (PVA) a été associé aux verres élaborés dans un système quaternaire (BG) 46S6 par les procédés cités (fusion, sol-gel et sacffolds). Différents paramètres intervenant dans les synthèses des verres bioactifs ont été étudiés, nous citons à titre d’exemple : la température, le pH, la taille des particules, le rapport Polymère / verres, la microstructure, la porosité et la biodégradation. Les caractéristiques thermiques des verres élaborés ont été également déterminées après chaque synthèse par analyse thermique différentielle (DSC/TG, DTA/TG). Ainsi, la température de fusion
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Silva, Dany Geraldo Kramer Cavalcanti e. "Desenvolvimento de nanocomp?sito (hidroxiapatita/ poliuretano) pela gela??o (gelling) de poli ( ?lcool vin?lico) (PVA) para remo??o de metais pesados." Universidade Federal do Rio Grande do Norte, 2013. http://repositorio.ufrn.br:8080/jspui/handle/123456789/15605.

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Made available in DSpace on 2014-12-17T14:57:57Z (GMT). No. of bitstreams: 1 DanyGKCS_TESE.pdf: 7629414 bytes, checksum: 0319ec74d00ba690b4f1a60f7aab52d1 (MD5) Previous issue date: 2013-10-18<br>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 chara
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Souza, Sivoney Ferreira de [UNESP]. "Obtenção de nanofibras de curauá e aplicação como reforço em compósitos baseados em PVA." Universidade Estadual Paulista (UNESP), 2010. http://hdl.handle.net/11449/90547.

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Made available in DSpace on 2014-06-11T19:24:41Z (GMT). No. of bitstreams: 0 Previous issue date: 2010-09-03Bitstream added on 2014-06-13T18:52:26Z : No. of bitstreams: 1 souza_sf_me_botfca.pdf: 1653750 bytes, checksum: 3aa87de3ba9ede42d6a64a6e7aef2e61 (MD5)<br>Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)<br>O momento atual de maior preocupação ambiental global, a crescente escassez dos recursos fósseis, bem como as novas regulagens ambientais força a busca por materiais que sejam renováveis e compatíveis com o ambiente. Novos materiais estão sendo desenvolvidos a partir de
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Souza, Sivoney Ferreira de 1982. "Obtenção de nanofibras de curauá e aplicação como reforço em compósitos baseados em PVA /." Botucatu : [s.n.], 2010. http://hdl.handle.net/11449/90547.

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Orientador: Alcides Lopes Leão<br>Banca: Elisabete Frollini<br>Banca: Pedro de Magalhães Padilha<br>Resumo: O momento atual de maior preocupação ambiental global, a crescente escassez dos recursos fósseis, bem como as novas regulagens ambientais força a busca por materiais que sejam renováveis e compatíveis com o ambiente. Novos materiais estão sendo desenvolvidos a partir de várias fontes naturais e, entre eles a celulose é o mais abundante dos polímeros naturais e um dos mais utilizados. Logo, o objetivo desta dissertação de mestrado foi obter nanofibras de celulose tendo como fonte a fibra
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8

Rasselet, Damien. "Etude de nanocomposites basés sur des alliages PLA/PA11." Thesis, IMT Mines Alès, 2019. http://www.theses.fr/2019EMAL0001/document.

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L’acide polylactique (PLA) est l’un des polymères biosourcés qui suscite le plus d’intérêt, mais ses propriétés thermomécaniques nécessitent d’être améliorées. Pour ce faire, les méthodes les plus utilisées et étudiées sont de le mélanger avec d’autres polymères ou bien d’y ajouter des charges minérales nanométriques (nanoparticules), afin de constituer un nanocomposite à matrice PLA. C’est dans la combinaison de ces deux approches que s’inscrivent ces travaux de thèse, consacrés à l’élaboration et à la caractérisation des propriétés de nanocomposites à base d’un alliage de PLA et de polyamide
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9

Piao, Haiyuan. "Microbial-derived cellulose-reinforced biocomposites." Thesis, University of Canterbury. Mechanical Engineering, 2006. http://hdl.handle.net/10092/1139.

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The preparation and characterisation of novel nano-scale biodegradable biocomposite materials, consisting of bacterial cellulose (BC) in a poly(lactic acid) (PLA) matrix, are investigated. BC exhibits high purity, high mechanical strength and an ultra-fine fibrous 3D network structure, while PLA is low cost, biodegradable matrix material derived from natural resources. In this work, composites of BC reinforced PLA were prepared using a solution exchange process and compression molding. The microstructure of the raw materials and composites was characterised using scanning electron microscopy (
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Ocwelwang, Atsile Rosy. "Photocatalytic activity and antibacterial properties of Ag/N-doped TiO2 nanoparticles on PVAE-CS nanofibre support." Thesis, University of Fort Hare, 2012. http://hdl.handle.net/10353/d1006794.

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Lack of potable water is one of the major challenges that the world faces currently and the effects of this are mainly experienced by people in developing countries. This has therefore propelled research in advanced oxidation technologies AOTs to improve the current water treatment methods using cost effective, non toxic and efficient treatment methods. Hence, in this study the sol-gel synthesis method was used to prepare TiO2 nanoparticles that were photocatalytically active under UV and visible solar light as well as possessing antibacterial properties. Silver and nitrogen doping was carried
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Correia, Carla Almêda. "Obtenção e caracterização de PLA reforçado com nanocelulose." Universidade de São Paulo, 2015. http://www.teses.usp.br/teses/disponiveis/3/3133/tde-22062016-082528/.

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A celulose é o polímero natural renovável disponível em maior abundância atualmente. Por possuir estrutura semicristalina, é possível extrair seus domínios cristalinos através de procedimentos que ataquem sua fase amorfa, como a hidrólise ácida, obtendo-se assim partículas cristalinas chamadas nanopartículas de celulose (NCs). Estas nanopartículas têm atraído enorme interesse científico, uma vez que possuem propriedades mecânicas, como módulo de elasticidade e resistência à tração, semelhantes a várias cargas inorgânicas utilizadas na fabricação de compósitos. Além disso, possuem dimensões nan
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12

BASILISSI, LUCA. "SYNTHESIS OF PLA HOMO AND COPOLYMERS AND THEIR NANOCOMPOSITES FOR ADVANCED MATERIALS." Doctoral thesis, Università degli Studi di Milano, 2012. http://hdl.handle.net/2434/168372.

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During the past 20 years, a number of aliphatic polyesters have aroused considerable interest due to their biodegradability and biocompatibility, since their use would to reduce the quantity common non-biodegradable polymers (for example PET). In this scenario, studies (both academic and industrial) have been focused on one polymer in particular: polylactic acid (PLA). It is biodegradable, biocompatible and compostable and derives from renewable resources such as corn, potato, cane molasses and beet sugar; it belongs to the family of aliphatic polyesters commonly obtained from α-hydroxy acids
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13

Abtahi, Mojtaba. "Toughening of Polylactide (PLA): Routes towards Improvement in Mechanical Properties and Toughness." Thesis, The University of Sydney, 2013. http://hdl.handle.net/2123/9409.

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This thesis is about the toughening of poly lactide (PLA). PLA has the potential to be of great importance to the materials world, not only as a solution to address pollution wastes of plastics, but also as a best candidate to be derived from non-petroleum based and renewable resources. The most significant drawback of PLA is its brittleness, which is the focus of the present thesis. Chapter 1 is literature review that focuses mainly on available data on the connections between structure-property relationship of PLA and PLA nanocomposites, and toughening. Chapter 2 entitled: “Improving the Mec
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14

Doumbia, Awa Soronfe. "Développement de filaments nanocomposites à base de polylactide « PLA » : application aux textiles antibactériens." Thesis, Lille 1, 2012. http://www.theses.fr/2012LIL10059/document.

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Ce travail de thèse se place dans le contexte de la valorisation du polylactide (PLA), un polymère issu de ressources renouvelables, dans le secteur des textiles techniques. Ainsi, de nouveaux filaments nanocomposites ont été élaborés par filage en voie fondue suivi d’un étirage, un procédé facile à mettre en œuvre en milieu industriel et exempt d’utilisation de solvants. Les charges utilisées sont les nanoparticules d’oxyde de zinc (ZnO) et d’argent (Ag) largement utilisées pour apporter des propriétés antibactériennes aux matériaux. De plus, ils sont non toxiques pour les cellules mammifères
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15

Souza, Patrícia Moraes Sinohara 1988. "Estudo da influência de argilas organofílicas no processo de biodegradação de nanocompósitos de PLA e seus efeitos genotóxicos e mutagênicos." [s.n.], 2013. http://repositorio.unicamp.br/jspui/handle/REPOSIP/266645.

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Orientadores: Ana Rita Morales, Maria Aparecida Marin-Morales<br>Dissertação (mestrado) - Universidade Estadual de Campinas, Faculdade de Engenharia Química<br>Made available in DSpace on 2018-08-22T13:30:08Z (GMT). No. of bitstreams: 1 Souza_PatriciaMoraesSinohara_M.pdf: 5897831 bytes, checksum: ff702db4dd4540ec41606b5fd8a007e3 (MD5) Previous issue date: 2013<br>Resumo: Neste estudo, foram preparados nanocompósitos de PLA e argilas organofílicas Cloisite 20A e Cloisite 30B, pelo método de intercalação do fundido. Os materiais foram caracterizados mediante Difração de Raios-X (DRX), Microsco
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16

Shojaeiarani, Jamileh. "Improving Performance Characteristics of Poly (Lactic Acid) (PLA) Based Nanocomposites by Enhanced Dispersion of Modified Cellulose Nanocrystals (CNCs)." Diss., North Dakota State University, 2018. https://hdl.handle.net/10365/29228.

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Poly(lactic acid), (PLA) is a biodegradable and biocompatible polymer which has attracted significant attention as a promising substitute for petroleum-based polymers. To optimize the usage of PLA in a wide range of applications, different methods such as polymer blending and the incorporation of traditional and nanofillers have been extensively explored. Cellulose nanocrystals (CNCs), rod-like nanoparticles with a perfect crystalline structure, are considered as outstanding reinforcing agent owing to the excellent mechanical properties. The optimal characteristics of CNCs as a reinforcing age
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17

Dhuiège, Benjamin. "Acylation des nanocelluloses en milieu aqueux par transestérification des esters de vinyle et utilisation comme charge dans le caoutchouc naturel." Thesis, Bordeaux, 2017. http://www.theses.fr/2017BORD0645/document.

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Ce travail de thèse a pour objectif d’élaborer de nouveaux matériaux composites (élastomères, adhésifs) en utilisant les nanocelluloses (NCC et NFC) comme renforts mécaniques biosourcés. Une méthode de fonctionnalisation des nanocelluloses en conditions aqueuses a d’abord été développée, dans le but ultime d’améliorer leur compatibilité avec les matrices polymères. La réaction, basée sur la transestérification des esters de vinyle, a été optimisée à partir de l’acétate de vinyle utilisé comme réactif modèle. Le greffage en conditions basiques s’est avéré efficace, mais a également conduit à la
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18

Bartolomei, Suellen Signer. "Estudo de nanocompósitos formados por PLA e nanopartículas de celulose." Universidade de São Paulo, 2016. http://www.teses.usp.br/teses/disponiveis/3/3133/tde-04072016-152946/.

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Devido à preocupação com o meio ambiente e o volume crescente de resíduos plástico em aterros sanitários, os polímeros biodegradáveis estão sendo estudados extensivamente. Um deles é o PLA. Apesar de possuir propriedades comparáveis a polímeros commodities e polímeros de engenharia, ainda é necessário melhorar certas características do PLA, como resistência ao impacto. Para isso, a nanocelulose (NC) pode ser usada sem alterações significativas na biodegradação polimérica. Este estudo teve como objetivo obter a nanocelulose, caracteriza-la e incorpora-la ao poli(ácido láctico) (PLA), assim como
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19

Ben, Hamou Karima. "Extraction de nanofibrilles de cellulose à structure et propriétés contrôlées : caractérisation, propriétés rhéologiques et application nanocomposites." Thesis, Université Grenoble Alpes (ComUE), 2015. http://www.theses.fr/2015GREAI073/document.

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Les nanofibrilles de cellulose (NFC), obtenus par oxydation TEMPO des microfibrilles de cellulose native sous forme de suspensions colloïdales aqueuses, sont des nanoparticules biosourcées ayant des propriétés rhéologiques et optiques particulièrement séduisantes pour la conception de nanomatériaux à haute performance. Le but principal de cette étude était de contrôler et optimiser les conditions de préparation de ces NFCs extraites du rachis de palmier dattier en examinant le temps d'oxydation et le nombre de passe à travers l'homogéinsateur.La réussite de la réaction a été démontrée par spec
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Kwa, Teik Lim. "NOVEL ON-LINE TRUE STRESS-STRAIN-ELECTRICAL CONDUCTIVITYUNIAXIAL TENSILE STRETCHING SYSTEM AND ITS UTILITY ON ELECTRICALLYCONDUCTIVE POLYLACTIC ACID (PLA) NANOCOMPOSITES." University of Akron / OhioLINK, 2006. http://rave.ohiolink.edu/etdc/view?acc_num=akron1143663747.

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Ginoux, Geoffrey. "Impression 3D et nanocomposites : Étude du comportement de mélanges PLA/argile appliquée à la fabrication additive par extrusion de matériaux." Thesis, Reims, 2018. http://www.theses.fr/2018REIMS016/document.

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La fabrication additive est un procédé d’élaboration permettant la mise en forme d’une pièce par ajout de matière, par empilement de couches successives. Bien que de plus en plus de polymères puissent être mis en œuvre par cette technologie, les polymères chargés en sont quasiment absents, alors qu’ils sont largement utilisés dans les autres types de procédés de mise en forme. Les objectifs scientifiques et technologiques du projet concernent (i) une meilleure compréhension des relations entre le comportement rhéologique de systèmes polymères et leur aptitude à la mise en forme par les technol
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Gissentaner, Tremaine D. "Development of Conductive Green Polymer Nano-Composite for use in Construction of Transportation Infrastructure." Ohio University / OhioLINK, 2014. http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1408697877.

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23

Cazotti, Jaime Caetano. "Síntese e caracterização de látices híbridos de poli(acetato de vinila)/montmorilonita - PVAc/MMT para aplicação como adesivos." Universidade de São Paulo, 2011. http://www.teses.usp.br/teses/disponiveis/97/97136/tde-27082013-103950/.

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Este projeto de mestrado teve como objetivo a obtenção de látices híbridos constituídos de poli(acetato de vinila) (PVAc) e argila montmorilonita (MMT). O homopolímero de acetato de vinila foi sintetizado através da técnica de polimerização em emulsão na presença de diferentes tipos de argila, sendo empregada uma argila sódica (Na-MMT) e três argilas modificadas (o-MMT) com diferentes sais quaternários de amônio. Poli(álcool vinílico) (PVOH) foi utilizado como colóide protetor e persulfato de amônio (APS) como iniciador. Foi estudada a melhor condição para incorporação da argila na matriz poli
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Oliveira, Amanda Gerhardt de. "Desenvolvimento e avaliação de nanocompósitos à base de polietileno de alta densidade (hdpe-vERDE)/poli(ácido lático) (pla) e nanocarbonato de cálcio para fabricação de embalagens." Universidade do Estado do Rio de Janeiro, 2015. http://www.bdtd.uerj.br/tde_busca/arquivo.php?codArquivo=8770.

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Este trabalho traz como proposta a obtenção de nanocompósitos (PLA/HDPE-g-AM/HDPE-Verde/n-CaCO3) com propriedades mecânicas e de fluxo adequadas para aplicação no setor de embalagens. A produção desses nanocompósitos ocorreu por meio de uma mistura de PLA e polietileno proveniente de fonte renovável (HDPE-Verde), viabilizada pela ação do agente compatibilizante polietileno enxertado com anidrido maleico (HDPE-g-AM) e do aditivo carbonato de cálcio nanoparticulado (n-CaCO3), através do estudo das condições ótimas de processamento e composição, realizado por meio do Planejamento Fatorial Delinea
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Costa, Alfredo Nuno Mota Ribeiro da. "Nanocompósitos de matriz polimérica para impressão 3D." Master's thesis, Universidade de Aveiro, 2016. http://hdl.handle.net/10773/16859.

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Mestrado em Engenharia Mecânica<br>O fabrico aditivo apresenta enorme potencial, uma vez que permite produzir objetos de geometrias complexas muitas vezes sem recorrer a ferramentas auxiliares, sendo ainda capaz de usar uma vasta gama de materiais. Um exemplo de uma das tecnologias aditivas é o fabrico por filamento fundido (FFF), frequentemente associado ao termo "impressão 3D". Um dos materiais termoplásticos mais utilizado é o ácido poliláctico (PLA), um material biocompatível e biodegradável, cuja produção industrial é menos poluente do que a maioria dos termoplásticos presentes no
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Foston, Marcus Bernard. "Cyclic, tethered and nanoparticulate silicones for material modification." Diss., Atlanta, Ga. : Georgia Institute of Technology, 2008. http://hdl.handle.net/1853/24762.

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Thesis (Ph.D.)--Polymer, Textile and Fiber Engineering, Georgia Institute of Technology, 2009.<br>Committee Chair: Dr. Haskell W. Beckham; Committee Member: Dr. Anselm Griffin; Committee Member: Dr. Johannes Leisen; Committee Member: Dr. Sankar Nair; Committee Member: Dr. Uwe Bunz.
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Le, Gars Manon. "Surface modifications of cellulose nanocrystals for biobased food packaging applications Polymerization of glycidyl methacrylate from the surface of cellulose nanocrystals for the elaboration of PLA-based nanocomposites Role of solvent exchange in dispersion of cellulose nanocrystals and their esterification using fatty acids as solvents." Thesis, Université Grenoble Alpes, 2020. http://www.theses.fr/2020GRALI021.

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Ce projet vise à développer de nouvelles modifications chimiques de surface des nanocristaux de cellulose (NCC), afin d'améliorer leur compatibilité avec le polymère biosourcé qu'est l'acide polylactique (PLA), afin de combiner leurs propriétés intrinsèques respectives. Ainsi, des matériaux multiphasiques ont été produits à partir de PLA en y incluant des nanomatériaux cellulosiques. L'application visée est celle de l'emballage alimentaire, et l'amélioration des propriétés barrières du PLA, notamment vis-à-vis de l'oxygène et de la vapeur d'eau, est alors un point clé dans la caractérisation d
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Martínez, Sanz Marta. "Bacterial cellulose nanowhiskers to enhance the properties of plastics and bioplastics of interest in food packaging." Doctoral thesis, Universitat Politècnica de València, 2013. http://hdl.handle.net/10251/30312.

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El presente trabajo tiene por objetivo estudiar las aplicaciones de los nanocristales o ¿nanowhiskers¿ extraídos mediante hidrólisis ácida de celulosa bacteriana (BCNW) para el desarrollo de materiales poliméricos y biopoliméricos con propiedades mejoradas para su uso en aplicaciones de envasado de alimentos. En primer lugar se estudió y optimizó el proceso de extracción de BCNW. Se desarrolló un procedimiento de extracción con ácido sulfúrico, que permitió obtener nanocristales con elevada relación de aspecto y cristalinidad y al mismo tiempo, un elevado rendimiento de extracción. Este pr
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莊志偉. "Preparation of PVA/Montmorillonite and PP/Montmorillonite Nanocomposite." Thesis, 2003. http://ndltd.ncl.edu.tw/handle/73869998160192102371.

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碩士<br>國立海洋大學<br>食品科學系<br>91<br>Nanocomposites of polypropylene (PP)/montmorillonite and poly(vinyl alcohol) (PVA)/montmorillonite were prepared by melt and solution intercalation, respectively. The extent of dispersion of montmorillonite in polymer matrix could be confirmed by X-ray diffraction (XRD). Cetylpyridinium chloride (CPC) was used to modify the montmorillonite, and the interlayer distance was increased to 2.21 nm after the ion exchange with the cation between CPC and montmorillonite. Un-modified montmorillonite mixed with PVA could form intercalated nanocomposite, and exfoliated nano
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Shaw, Sanu. "Mechanical Property Enhancement of PVP-PVA Nanocomposite by Graphene Oxide." Thesis, 2017. http://ethesis.nitrkl.ac.in/8674/1/2017_MTech_215CR2302_SShaw.pdf.

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Graphene, is the building block of many carbon forms, including graphite, carbon nanotubes and Buck-minster fullerenes. It has honey-comb lattice structre with an atomic layer of sp2bonded carbon atoms. Its excellent properties for example, like Youngs modulus is about 1 TPa, breaking strength is about 140 GPa, thermal conductivity is about 5000 Wm-1K-1, and high specific surface area of about 2650 m2g-1.One of the most important application of graphene is in the fabrication of layered polymer nano-composites. Its unique two dimensional morphology provides high available surface area with very
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liang-tau, Chang, and 張良濤. "Studies on the Preparation of PVA/SiO2and PE/Al2O3 Nanocomposite Polymers." Thesis, 2007. http://ndltd.ncl.edu.tw/handle/34762944550884908710.

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碩士<br>明新科技大學<br>化學工程研究所<br>95<br>This research is divided into two parts. The first part is studied on the preparation of PVA/SiO2 nanocomposite polymers and the second part is studied on the preparation of PE/Al2O3 nanocomposite polymers. For the first part, at the nanoscale of SiO2, owing to the particle size is very small, the surface energy is very higher and easily aggregated when SiO2 dispersed in the PVA. In this research, SiO2 nanoparticles were dispersed in the PVA containing surfactants. The surfactants were used as a disperse agents to improve SiO2 nanoparticles dispersed in the PVA
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Chung, Yueh-Ru, and 鍾岳儒. "The effect of crosslinker structure on barrier performance of PVA/GO nanocomposite film." Thesis, 2016. http://ndltd.ncl.edu.tw/handle/11283292487437692737.

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碩士<br>中原大學<br>化學工程研究所<br>104<br>Developing a high-performance barrier films attract more attention due to rapid increase of use in food packaging, pharmaceutical, electrical devices, organic materials and metal components. In this study, we fabricated a graphene oxide (GO)/polyvinyl alcohol (PVA) nanocomposite membrane with different cross-linker by solution coating to obtain high water vapor and oxygen barrier film. The role of cross-linker is to provide more stable for final membrane product. Therefore, we studied the effect of cross-linker structure, concentration and cross-linking time on
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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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Lu, Chia-Jung, and 呂嘉容. "A Study on Fabrication and Functional Properties of PVA/ Coir Charcoal / Nano-Ag Nanocomposite Fibrous Membrane by Taguchi Method." Thesis, 2011. http://ndltd.ncl.edu.tw/handle/79ahsc.

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碩士<br>國立臺北科技大學<br>有機高分子研究所<br>99<br>In this study, polyvinyl alcohol (PVA) fibrous membranes with porosity and multi-functions containing nano-silver particles (17.7nm) and coir charcoal powders (332.9nm) was fabricated by electrospinning. The Taguchi method was applied to obtain design parameters for high reproducibility, high quality, high stability, high accuracy, lower processing time and lower cost. In this study, the Experiment is divided into four stages. The first stage, Wet Grinding was applied to obtain coir charcoal powders; the second stage, nano-silver particles was fabricated by
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Kashyap, Swarnima. "Interface Strengthened Graphene Oxide Reinforced PVA Nanocomposites." Thesis, 2017. http://ethesis.nitrkl.ac.in/8669/1/2017_PhD_511CR102_SwarnimaKashyap.pdf.

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Graphene, an atomic layer of sp2 bonded carbon atoms in the hexagonal lattice, is the building block of many carbon forms, including carbon nanotubes, Buckminster Fullerenes, carbon onions, and graphite. Its exceptional properties, for example, Young's modulus of 1 TPa, breaking strength of 140 GPa, thermal conductivity of 5000 Wm-1K-1, and high specific theoretical surface area of 2650 m2g-1, have warranted use in many structural and functional applications. One of the most important uses of it lies as fillers in the fabrication of polymeric nanocomposites. Its special two-dimensional morphol
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Huang, Yao-Tang, and 黃堯堂. "Preparation and Characterisations of PVA/CaCO3 Nanocomposites." Thesis, 2007. http://ndltd.ncl.edu.tw/handle/37541301600027867107.

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碩士<br>國立成功大學<br>化學系專班<br>95<br>This thesis can be divided into two parts. For the first part, a series of poly(vinyl alcohol)/CaCO3 Nano- composites were prepared. The synthesis principle is first dissolves PVA according to the certain proportion in the water,and Joins the calcium hydroxide, and passes over the carbon dioxide to cause the calcium hydroxide to turn the calcium carbonate. Because the carbon dioxide enters PVA the way to be different, achieves the synthesis calcium carbonate particle size the difference. For the second part, thesis Nanocomposites were subsequently characterized b
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Chen, Wen-Yang, and 陳文揚. "Synthesis and Properties of PVA/TMPS/TiO2 Nanocomposites." Thesis, 2013. http://ndltd.ncl.edu.tw/handle/79007620049217225623.

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碩士<br>國立高雄師範大學<br>化學系<br>101<br>This research is to synthesize PVA/TMPS/TiO2 nanocomposites with good heat resistance, UV-shielding, high transparency and photocatalytic degradation by sol-gel methods. At the first, the TMPS was performed to the silanol intermediate by hydrolysis in acid solution of pH=2. In order to couple with the organic matrixes the inorganic TiO2 powder was modified by silanol. The active –OH functional groups of TMPS/TiO2 and organic PVA matrixes will progress condensation with each other to synthesize PVA/TMPS/TiO2 nanocomposites. The chemical bonding formation and th
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Shih, Chien-Chang, and 施建章. "The study of preparing PLA nanocomposites." Thesis, 2011. http://ndltd.ncl.edu.tw/handle/18611902834460128091.

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碩士<br>崑山科技大學<br>材料工程研究所<br>99<br>PLA are used as biomedical materials because they are biodegradable, but the vast majority of biodegradable polymers in clinical use are composed of rather stiff materials that exhibit limited extendibility, weak mechanical strength and poor thermal stability, they are unsuitable for use in numerous applications. We modified PLA with 2-methacryloyloxy- ethyl isocyanate (MOI) to prepare ductile PLA materials. By utilizing the sol-gel process, novel PLA nanocomposites were further prepared with improved thermal stability and mechanical properties. The 10% thermal
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Su, Yu-Nai, and 蘇裕迺. "A Study on Isocyanate-functionallized Graphene Oxide/PVA Nanocomposites as Proton Exchange Membranes." Thesis, 2017. http://ndltd.ncl.edu.tw/handle/90683464851663234020.

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碩士<br>國立雲林科技大學<br>化學工程與材料工程系<br>105<br>In this paper, the purpose of this study is to study the modification of polyvinyl alcohol proton exchange membrane with isocyanate functionalized graphene oxide (GO). The natural graphite was oxidized by Hummer's method to prepare graphene oxide and functionalized graphene oxide with different proportions of 4,4'-diisocyanate dicyclohexylmethane (4,4'-Methylenebis (cyclohexyl isocyanate), HDI). HDI its molecular structure at both ends with an isocyanate (-NCO) functional groups, with hydroxyl and carboxyl reaction, the formation of amide and aminocarboxy
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SU, YU-NAI, and 蘇裕迺. "A Study on Isocyanate-functionallized Graphene Oxide/PVA Nanocomposites as Proton Exchange Membranes." Thesis, 2019. http://ndltd.ncl.edu.tw/handle/d2a4ec.

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碩士<br>國立雲林科技大學<br>化學工程與材料工程系<br>107<br>In this paper, the purpose of this study is to study the modification of polyvinyl alcohol proton exchange membrane with isocyanate functionalized graphene oxide (GO). The natural graphite was oxidized by Hummer's method to prepare graphene oxide and functionalized graphene oxide with different proportions of 4,4'-diisocyanate dicyclohexylmethane (4,4'-Methylenebis (cyclohexyl isocyanate), HDI). HDI its molecular structure at both ends with an isocyanate (-NCO) functional groups, with hydroxyl and carboxyl reaction, the formation of amide and aminocarboxy
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Araújo, Andreia Isabel da Silva. "Thermal and UV stability of PLA nanocomposites." Master's thesis, 2012. http://hdl.handle.net/1822/22765.

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Dissertação de mestrado em Técnicas de Caracterização e Análise Química<br>Poly(lactic acid) (PLA) is a biodegradable aliphatic thermoplastic polyester well known for being a promising alternative to petroleum-based materials as it can be produced from renewable resources at low cost and recyclable to its monomer. Although this polymer has good properties compared to other biodegradable polymers, it presents some limitations, like poor thermal and mechanical resistance and limited gas barrier properties. The incorporation of nanoc
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"Poly (lactic acid) (PLA)/clay/wood nanocomposites." Tulane University, 2010.

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Poly (lactic acid) (PLA) is a promising substitute for conventional petroleum-based polymer materials as a result of its environmentally benign quality and suitable physical properties. However, there are also problems associated with properties, such as brittleness, low heat deflection temperature, low melt viscosity, as well as cost that prevent wide-range applications of PLA This work reports on melt extrusion preparation of PLA/clay/wood nanocomposites involving various compatibilizers, resulting in remarkable improvements in mechanical as well as in thermal material properties. In particu
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Chuang, Yi Chang, and 莊逸彰. "Preparation and Characterization of PVDF/PVAc Blend-based Nanocomposites." Thesis, 2015. http://ndltd.ncl.edu.tw/handle/29192839475514737989.

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Zheng, An-Miao, and 鄭安淼. "The Hydrolytic Degradation and Characterization of PLA/OMMT Nanocomposites." Thesis, 2011. http://ndltd.ncl.edu.tw/handle/94386334309181660962.

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碩士<br>萬能科技大學<br>材料科技研究所<br>99<br>In this study, montmorillonite clay was modified with NH4Cl and then exfoliated or intercalated the structures in a polylactic acid (PLA) martix by torque rheometer in the ratio of 0.5 wt %、3.0 wt %、5.0 wt %、8.0 wt %. X-ray diffraction (XRD) revealed that modified MMT was distributed successfully in the PLA matrix. And by TEM that the 3.0wt% OMMT dispersed in the PLA is also more uniform best. After thermal pressing, we used TGA to examine the thermal resistance of the resulting composites, co-rotating twin screw extruder palletizing system to blend OMMT and PL
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林佛典. "Novel Method for One Dimensional Silver Nanostructures Preparation from Electrospinning and Properties of Ag/PVA Nanocomposites." Thesis, 2013. http://ndltd.ncl.edu.tw/handle/05396107119409895182.

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Guan, Qi. "Fabrication and Characterization of PLA, PHBV and Chitin Nanowhisker Blends, Composites and Foams for High Strength Structural Applications." Thesis, 2013. http://hdl.handle.net/1807/42843.

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Biobased polymers are a critical research topic as they may serve as replacement to traditional unsustainable petro-chemical polymers. It is vital to widen its range of applications by improving its physical and mechanical properties via light weighting and strength improvements. Light weighting can be accomplished by introducing foam morphology to the material while mechanical strength improvements can be achieved by inserting stiff filler material to the base polymer to form a composite. This study explores the physical, mechanical, thermal, rheological and morphological properties of blends
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Huang, Chien Yi, and 黃建億. "The morphological and dielectric behaviors of PANI－DBSA/PAA nanocomposites." Thesis, 2007. http://ndltd.ncl.edu.tw/handle/34954407727699432747.

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碩士<br>輔仁大學<br>化學系<br>95<br>Abstract A high dielectric constant composite of polyaniline,PANI-DBSA/PAA has been synthesized by using the technique of in-situ polymerization of aniline in a aqueous dispersion of poly(acrylic acid) (PAA) in the presence of dodecylbenzene sulfonate (DBSA). The water-soluble PAA serves as a polymeric stabilizer which can protect the PANI particles from macroscopic aggregation . SEM micrograph reveals that the composite prepared consists of numerous nano-scale (~70nm) PANI particles evenly distributed within the PAA matrix . A high dielectric constant value of ca. 1
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Hu, Shu-Wei, and 胡書瑋. "Assessment of mechanical properties of PLA nanocomposite in the presence of chitosan." Thesis, 2010. http://ndltd.ncl.edu.tw/handle/63265733187159906802.

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碩士<br>輔仁大學<br>食品科學系<br>99<br>Incorporation of nano-filler into polyolefin structure has been widely used in current packaging development for better performance, such greater barrier and mechanical properties. The objectives of this study focused on the preparation and characterization of nanocomposite made of PLA and chitosan nanoparticles. Particle sizes of chitosan were ranging 5~10 μm, and were reduced nano scale by homogenizer; however, chitosan particles clustered to micrometers after standstill for hrs. Use of Tween-80 in an acidic chitosan
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CHIH-WEI, YANG, and 楊智崴. "Investigation of the better formula of PAN and PAA/clay nanocomposites." Thesis, 2016. http://ndltd.ncl.edu.tw/handle/sxpr63.

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碩士<br>國立臺北科技大學<br>有機高分子研究所<br>104<br>In this study, the PAA/clay nanocomposites and PAN/clay nanocomposites were prepared by in-situ polymerization. In the research, the first part was synthesized modifier (4-(N,N-Diethyldithiocarbamylmethyl)benzyltrimethylammonium Bromide) which is the RAFT regant helping monomer to polymerize.Sencond part was preparing nanocomposites. We modified Montomorilloite (C34P5 and CloisiteNa+) by modifier, then adding monomer to do in-situ polymerization. We try to use higher content(about 30%) of clay and use the instrument of XRD and FT-IR to identify the stru
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Tsai, Chia-Ju, and 蔡嘉儒. "Studies on the Degradation of PLA/Clay Nanocomposites by Streptomyces 76T-1." Thesis, 2010. http://ndltd.ncl.edu.tw/handle/18811748826103348060.

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碩士<br>淡江大學<br>化學工程與材料工程學系碩士班<br>98<br>Biodegradable polymers have recently attracted great attension because environmental pollution. PLA is a aliphatic thermoplastic polyester and a biodegradation plastic. In this study, we use hydrophobic intercalation agent (POP-diamine) to ezpansion the inter-lamellar space of Na+-MMT. We hope it could increase the disperse of montmorillonite. Then we measure the physical properties and mechanical properties, and compare with commercial modified montmorillonite (C30B).Finally, we degrade the PLA nanocomposites by streptomyces 76T-1 to investigate the degra
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