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Dissertations / Theses on the topic 'Polyester'

Author: Grafiati

Published: 4 June 2021

Last updated: 26 July 2025

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1

Schmidt, Juliane, Ren Wei, Thorsten Oeser, et al. "Degradation of Polyester Polyurethane by Bacterial Polyester Hydrolases." Universität Leipzig, 2017. https://ul.qucosa.de/id/qucosa%3A21100.

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Polyurethanes (PU) are widely used synthetic polymers. The growing amount of PU used industrially has resulted in a worldwide increase of plastic wastes. The related environmental pollution as well as the limited availability of the raw materials based on petrochemicals requires novel solutions for their efficient degradation and recycling. The degradation of the polyester PU Impranil DLN by the polyester hydrolases LC cutinase (LCC), TfCut2, Tcur1278 and Tcur0390 was analyzed using a turbidimetric assay. The highest hydrolysis rates were obtained with TfCut2 and Tcur0390. TfCut2 also showed a

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2

Wen, Yahui. "Graphene-based thermosetting polymer nanocomposites : unsaturated polyester and hyperbranched polyester." Thesis, University of Sheffield, 2018. http://etheses.whiterose.ac.uk/20921/.

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3

Skurat, Harris Heidi A. "Buried in polyester." Virtual Press, 2007. http://liblink.bsu.edu/uhtbin/catkey/1371477.

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Buried in Polyester is a collection of essays in three parts loosely connected around the theme of the loss of my mother. Much like JoAnn Beard's The Boys of My My Youth, the essays hold up pieces of my life for inspection and puts them down again, not always with a sense of resolution. The subtext of the piece revolves around the search to put together the pieces of what my life was before and after my mother, and the transition from girlhood to adulthood with the absence of my mother. I hope also to explore how the self splits after a traumatic death, and the desperate attempt at recreation

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4

Abou, Zeid Dunja Manal. "Anaerobic biodegradation of natural and synthetic polyesters (Anaerober Bioabbau von natürlichen und synthetischen Polyestern) /." [S.l. : s.n.], 2001. http://deposit.ddb.de/cgi-bin/dokserv?idn=96282593X.

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5

Marten, Elke. "Korrelationen zwischen der Struktur und der enzymatischen Hydrolyse von Polyestern." [S.l. : s.n.], 2000. http://deposit.ddb.de/cgi-bin/dokserv?idn=959804153.

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6

Islam, Nazirul. "Fundamental investigations on the barrier effect of polyester micro fiber fabrics towards particle loaded liquids induced by surface hydrophobization." [S.l. : s.n.], 2004. http://deposit.ddb.de/cgi-bin/dokserv?idn=973470941.

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7

Kiefer, Laura A. "Synthesis and characterizaton of novel polyester/polysiloxane and polyester/arylphosphine oxide copolymers." Diss., This resource online, 1993. http://scholar.lib.vt.edu/theses/available/etd-07122007-103944/.

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8

Plikk, Peter. "Porous degradable polyester scaffolds /." Stockholm : Royal Institute of Technology, 2006. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-3960.

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9

Coleshill, Anita. "Synthesis of polyester dendrimers." Thesis, University of Warwick, 1998. http://wrap.warwick.ac.uk/55728/.

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Dendrimers are a fairly new class of macromolecule. They have many potential uses including use in surface coatings and as host molecules. There are two main methods available for constructing dendrimers, the convergent approach and the divergent approach. In this thesis dendrimers were synthesised using the divergent approach. In chapter one our original aim was to synthesise dendrimers based on bicine, but there were complications involved in synthesis and storage of the monomer. However, it was possible to make a iminium salt using bicine as the starting material, which was reacted with var

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10

Pierce, Benjamin Franklin Ashby Valerie. "Thermally-responsive polyester urethanes." Chapel Hill, N.C. : University of North Carolina at Chapel Hill, 2008. http://dc.lib.unc.edu/u?/etd,1982.

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Thesis (Ph. D.)--University of North Carolina at Chapel Hill, 2008.<br>Title from electronic title page (viewed Dec. 11, 2008). "... in partial fulfillment of the requirements for the degree of Doctor of Philosophy in the Department of Chemistry." Discipline: Chemistry; Department/School: Chemistry.

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11

Liu, Shu. "Molecular necklaces : polyester rotaxanes /." Diss., This resource online, 1995. http://scholar.lib.vt.edu/theses/available/etd-02272007-092408/.

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12

Kay, Martin John. "Microbial degradation of polyester polyurethane." Thesis, University of Central Lancashire, 1992. http://clok.uclan.ac.uk/20311/.

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During the course of these studies, polyester polyurethane foam has been found to be readily degraded in soil and marine environments. The incorporation of the formulation biocide Vinyzene E.P. reduced the rate and extent of degradation in test material exposed to soil conditions, but was found to be ineffective in preventing degradation when exposed to the marine environment. As a result of these studies, a number of fungi, representing a range of genera, have been isolated, identified, and shown using Kochian principles to degrade polyester polyurethane as a sole source of carbon. A list of

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13

Martin, Lee. "Compatibilisation of polysulphones/polyester blends." Thesis, Loughborough University, 1994. https://dspace.lboro.ac.uk/2134/11846.

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Ternary blends comprising Polysulphones [Polyethersulphone (PES) and Polysulphone (PSO)], the Polyhydroxyether of bisphenol-A (Phenoxy), and Polyesters [Poly( ethylene terephthlate) (PET) and Poly(butylene terephthlate) (PBT)] have been studied particularly with the aim in mind of elucidating the factors determining their miscibility and morphology. Binary and ternary combinations, including equivalent systems based on a butylene terephthlate-tetramethylene oxide block copolymer (PBT-TMO), were prepared from solution and by mixing in the melt state using both an internal mixer and a twin screw

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14

Jones, Stephen M. "High performance polyester-based materials." Thesis, University of Reading, 2015. http://centaur.reading.ac.uk/49313/.

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Biaxially oriented films produced from semi-crystalline, semi-aromatic polyesters are utilised extensively as components within various applications, including the specialist packaging, flexible electronic and photovoltaic markets. However, the thermal performance of such polyesters, specifically poly(ethylene terephthalate) (PET) and poly(ethylene-2,6-naphthalate) (PEN), is inadequate for several applications that require greater dimensional stability at higher operating temperatures. The work described in this project is therefore primarily focussed upon the copolymerisation of rigid comonom

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15

Wang, Xiaojiang. "Polyester Based Hybrid Organic Coatings." University of Akron / OhioLINK, 2012. http://rave.ohiolink.edu/etdc/view?acc_num=akron1340906197.

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16

Kulkarni, N. G. "Studies in polyester forming reactions." Thesis(Ph.D.), CSIR-National Chemical Laboratory, Pune, 2005. http://dspace.ncl.res.in:8080/xmlui/handle/20.500.12252/2470.

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17

Wu, Chonggang. "Transesterification, Phase Transition, Rheology, and Mechanical Properties of Blends of Thermoplastic Polyester and Thermotropic Polyester." University of Akron / OhioLINK, 2006. http://rave.ohiolink.edu/etdc/view?acc_num=akron1143780405.

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18

Turlier, Bastien. "Nouveau procédé de synthèse de polyester par extrusion réactive." Thesis, Lyon, 2017. http://www.theses.fr/2017LYSEI132.

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Ce travail de thèse concerne l’élaboration et l’optimisation d’un procédé de synthèse par extrusion réactive de polyesters aliphatiques par polycondensation de l’acide sébacique avec le 1,6-hexanediol. L’utilisation des polyesters est un secteur en constante augmentation depuis ces dernières années notamment avec l’utilisation du poly(éthylène téréphtalate) dans des applications d’emballages. Cependant, la synthèse de ces polymères est basée sur des réactions de polycondensations dont les cinétiques sont classiquement assez lentes ce qui entraîne des durées de synthèse longues et in fine assez

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19

Garin, Matthieu. "Synthèse et étude des propriétés physico-chimiques des poly(butylène succinate)s linéaire et branché." Thesis, Reims, 2012. http://www.theses.fr/2012REIMS014/document.

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Le poly(butylène succinate) (PBS) est un polyester aliphatique biodégradable dont les propriétés en font un bon candidat pour le remplacement des polyoléfines. De plus, ses deux monomères, l'acide succinique et le butane-1,4-diol, peuvent être issus de la biomasse via un procédé de fermentation de sucres. L'étude réalisée ici a été séparée en deux grandes parties : le PBS linéaire d'une part et le PBS branché d'autre part. La première partie montre que la cinétique de synthèse du PBS suit bien le modèle d'estérification établi par Flory. Par la suite, l'étude des propriétés physico-chimiques d

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20

NYSTRÖM, ANNA-KARIN, and JOSEFINE OLSSON. "Changing to polyester in airbags : A study of two test methods used for polyester fabric analyse." Thesis, Högskolan i Borås, Institutionen Textilhögskolan, 2013. http://urn.kb.se/resolve?urn=urn:nbn:se:hb:diva-17364.

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This thesis is part of an on going project within Autoliv Sweden AB to develop the process in changing the material in airbags. Most airbags are today constructed of fabric in polyamide 6.6 (PA6.6) and the thesis view the possibility of changing the material to one of three different polyesters (PET1, PET2, PET3). Both materials have different properties that have been looked into by two test methods, linear testing and dynamic testing with cold gas. The two testing methods were conducted on plain fabric and on fabric with seam to see differences in the materials when subjected to different st

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21

Fehervari, Sylvie. "Propriétés mécaniques d'une résine polyester, influence d'une pression de confinement : application à un composite polyéthylène-polyester." Lille 1, 1995. http://www.theses.fr/1995LIL10001.

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La plasticité de la résine polyester a été évaluée en traction et en compression à vitesse de déformation constante et en fluage. L'analyse thermodynamique de la déformation à vitesse de déformation imposée indique que la barrière locale d'énergie <go à la propagation des microzones cisaillées est la même en traction et en compression. En outre, la différence des volumes d'activation dans ces deux modes de sollicitation traduit une différence de contrainte d'écoulement. Les cinétiques de fluage en traction et en compression sont exprimées par une loi de type =atm. Nous mettons en évidence le r

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22

Welzel, Katharina. "Einfluss der chemischen Struktur auf die enzymatische Hydrolyse von Polyester-Nanopartikeln." [S.l. : s.n.], 2003. http://deposit.ddb.de/cgi-bin/dokserv?idn=968015271.

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23

Yun, Sung-Pil. "Neue Initiatoren für die ringöffnende Polymerisation von L-Lactid bei hohen Temperaturen." [S.l. : s.n.], 2002. http://deposit.ddb.de/cgi-bin/dokserv?idn=966413881.

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24

Kim, Min Suk. "Dynamic simulation of polyester mooring lines." Texas A&M University, 2003. http://hdl.handle.net/1969.1/15.

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A numerical scheme, known as CABLE3D, originally developed for the simulation of dynamics of steel chain-wire mooring lines is extended to allow for the large elongation in a mooring line, the dependence of the modulus on tension, and energy dissipation of a polyester rope under mean and cyclic loads. The modified CABLE3D is then integrated into a numerical package, known as COUPLE6D, for computing the interaction between a floating structure and its hybrid polyester mooring system. The Deepstar Spar is chosen in this study to represent the floating structure. By considering large elongation

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25

Schiller, Carsten. "Polyester und Calciumphosphate als resorbierbare Biomaterialien." [S.l.] : [s.n.], 2003. http://deposit.ddb.de/cgi-bin/dokserv?idn=969485298.

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26

Hedfors, Cecilia. "Lipase selectivity in functional polyester synthesis." Doctoral thesis, KTH, Biokemi, 2011. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-34023.

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Enzyme selectivity means that the enzyme´s preferences towards competing substrates will be different. In this thesis, the enzyme selectivity has been studied for utilization in synthesis of functionalized macromonomers. The aim was to study how the inherent –or introduced – selectivity of lipases can be used to introduce thiol‐ or enefunctionalities into short polyesters. Thiol‐ and ene‐functionalized renewable organic precursor molecules in combination with thiol‐ene click chemistry opens up for a sustainable material production. Lipases do not normally affect ene‐moieties and the preference

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27

Howells, David. "Vacuum deposited coatings on polyester films." Thesis, University of Oxford, 2006. https://ora.ox.ac.uk/objects/uuid:14c63b4c-1dad-4420-8d96-c15ff9188c57.

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The work contained in this thesis examines how the properties of polyester film substrates affect the structure and performance of thin coatings vacuum-deposited upon them, particularly with regards to their function as gas barriers for use in packaging. By modifying the surface of a PET film prior to deposition, with either oxygen or argon plasma, an increase in adhesion between the polymer and coating by 50% occurs for both aluminium and SiOₓ layers. A reduction in the density of pinhole defects is also observed after such treatment. A set of silicon oxide (SiOₓ) coatings, deposited using a

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28

Odelius, Karin. "Design of polyester and porous scaffolds." Licentiate thesis, Stockholm, 2005. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-493.

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29

Gerlach, Christian. "Sequential biaxial drawing of polyester film." Thesis, University of Oxford, 1998. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.267906.

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30

Ljungholm, Hanna, and Amanda Johansson. "Återvinning av blandmaterial : Polyamid och Polyester." Thesis, Högskolan i Borås, Akademin för textil, teknik och ekonomi, 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:hb:diva-200.

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Om människor fortsätter med det konsumtionsbeteende som råder idag kommer jor-den resurser ta slut. Den fossila råvaran petroleum används vanligtvis vid framställ-ning av polyester och polyamid. Petroleum har en 100 000 årlig process, vilket är en ofantlig skillnad i förhållande till den takt som det förbrukas. Därför har eventuella möjligheter att återskapa en ny filament av återvunnet syntetiskt blandmaterial un-dersökts i detta arbete. Det finns befintliga metoder för att återvinna polyester och polyamid som homogena material. Dock vid återvinning i en gemensam process av materialen får den

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31

Evans, Samantha Jane. "Modification of a biodegradable co-polyester." Thesis, University of Salford, 1997. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.426888.

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32

Pope, Benjamin J. "Spray deposition of cork reinforced polyester." Thesis, Massachusetts Institute of Technology, 2010. http://hdl.handle.net/1721.1/62535.

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Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 2010.<br>Cataloged from PDF version of thesis.<br>Includes bibliographical references (p. 55-57).<br>The objective of this research is to enable large part or high volume manufacturing processes to make consumer or industrial products from a cork reinforced polymer composite, similar to current applications of glass reinforced polyester. The low initial investment and high flexibility of the spray lay-up process make it an attractive candidate to study. A spray lay-up apparatus was successfully constructed a

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33

Battisti, Andrea. "Conductive carbon nanotube thermosetting polyester nanocomposites." Thesis, Cranfield University, 2009. http://dspace.lib.cranfield.ac.uk/handle/1826/7621.

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A commercial unsaturated polyester resin has been used in combination with commercial multiwalled carbon nanotubes (MWNTs) to study the effects of this nanofiller on the electrical properties of the mix in the liquid state, during the cure and in the solid state. The level of addition of the nanotubes ranged from 0.05 to 0.3 wt%. The dispersion of the filler particles in the matrix was carried out combining triple roll milling, horn sonication and high shear mixing. Qualitative optical and electronic microscopy characterisation supports the development of novel techniques for real-time quantit

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34

Evans, Sara J. "The thermal degradation of polyester thermosets." Thesis, Kingston University, 1989. http://eprints.kingston.ac.uk/20523/.

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35

Van, Uytvanck Pieterjan Paul. "Sustainability within the polyester value chain." Thesis, University of Cambridge, 2015. https://www.repository.cam.ac.uk/handle/1810/261721.

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Polyethylene terephthalate (PET) is used to make textile fibres, bottles and packaging films. The global production in 2013 was 65 Mt, growing at 5-7% per year over the last decade. PET is manufactured by the continuous polymerisation of ethylene glycol and terephthalic acid, both of which are produced from fossil fuels. This Dissertation examines the environmental impact of manufacturing PET using process modelling and life cycle assessment. The work focused on ways of reducing the environmental impact of the polymer manufacture by using biomass instead of conventional fossil fuels, either as

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36

Ogden, Dorothy. "Modifiable Hyperbranched Polyester Drug Delivery Systems." Wright State University / OhioLINK, 2011. http://rave.ohiolink.edu/etdc/view?acc_num=wright1316178520.

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37

Singh, Divya Singh. "SYNTHESIS OF CADDISFLY INSPIRED POLYESTER ADHESIVE." University of Akron / OhioLINK, 2018. http://rave.ohiolink.edu/etdc/view?acc_num=akron1523308439000894.

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38

Agnhage, Tove. "Eco-designed functionalization of polyester fabric." Doctoral thesis, Högskolan i Borås, Akademin för textil, teknik och ekonomi, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:hb:diva-12408.

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There is an increased awareness of the textile dyeing and finishing sector’s high impact on the environment due to high water consumption, polluted wastewater, and inefficient use of energy. To reduce environmental impacts, researchers propose the use of dyes from natural sources. The purpose of using these is to impart new attributes to textiles without compromising on environmental sustainability. The attributes given to the textile can be color and/or other characteristics. A drawback however, is that the use of bio-sourced dyes is not free from environmental concerns. Thus, it becomes para

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39

Knight, Pamela Tiffany. "Polyester-based Biodegradable Systems Incorporating POSS." Cleveland, Ohio : Case Western Reserve University, 2010. http://rave.ohiolink.edu/etdc/view?acc_num=case1250709236.

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Thesis(Ph.D.)--Case Western Reserve University, 2010<br>Title from PDF (viewed on 2009-12-22) Department of Macromolecular Science and Engineering Includes abstract Includes bibliographical references and appendices Available online via the OhioLINK ETD Center

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40

Segal, Edward Matthew. "Characterization of polyester-rope suspended footbridges." Thesis, Princeton University, 2015. http://pqdtopen.proquest.com/#viewpdf?dispub=3728851.

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<p> In rural parts of the world, lack of access to roads that are useable year-round significantly contributes to poverty. Suspended footbridges can improve access at locations that require medium span crossings (15 m to 64 m). This dissertation challenges the idea that modern bridges of this type must use steel rope, a well-established material for this application. Polyester rope, an unconventional bridge material, is investigated as an alternative to steel rope for rural suspended footbridges. The specific goals of this research are to: (i) characterize the static and dynamic behavior of po

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41

Gouteyron, Antoine. "Nouveaux monomères biosourcés à haute rigidité à destination des revêtements polyesters." Thesis, Lyon 1, 2015. http://www.theses.fr/2015LYO10266.

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Les résines polyesters sont des composants présents dans une majorité des revêtements et matériaux utilisés aujourd'hui. Ils sont obtenus par polycondensation de polyols, polyacides et monoacides. Les réglementations évoluant (REACH) et le public étant de plus en plus sensible à l'origine et l'impact des produits qu'il consomme, la substitution des produits pétrosourcés vers des matières premières renouvelables semble évidente. De nouveaux polyesters, composés majoritairement de monomères biosourcés, ont donc été synthétisés. L'acide L-(+)-tartrique a été principalement étudié, ce monomère qua

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42

Pavlova, Ewa. "Hyperbranched polyesters for polyurethane coatings: their preparation, structure and crosslinking with polyisocyanates." Doctoral thesis, Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2007. http://nbn-resolving.de/urn:nbn:de:swb:14-1172267166280-42303.

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In this work, hyperbranched aromatic polyesters-polyphenols based on 4,4-bis(4’ hydroxy¬phenyl)pentanoic acid (BHPPA) were prepared and, according to the authors knowledge, for the first time tested as precursors for polyurethane bulk resins and coatings. Comparison of poly-BHPPA with competing products The materials prepared in this work show better properties than their aliphatic polyester-polyol analoga based on 2,2-bis-(hydroxymethyl)propanoic acid (BHMPA). Especially, the solubility of poly-BHPPA in organic solvents is better and poly-BHPPAs also do not tend to microphase separation durin

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43

Blanquer, Sébastien. "Synthèses et étude de nouveaux copolymères pour la visualisation de dispositifs médicaux en imagerie par résonance magnétique." Thesis, Montpellier 2, 2011. http://www.theses.fr/2011MON20003/document.

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L'Imagerie par Résonance Magnétique (IRM) est à l'heure actuelle la technique de visualisation préférentiellement choisie par les chirurgiens. Cependant, cette technique ne permet pas de visualiser des prothèses à base de polymères, qu'elles soient dégradables ou non. Afin de mieux évaluer la fixation, l'intégration tissulaire et le devenir de l'implantation de ces prothèses polymères, il serait souhaitable qu'elles soient visibles par IRM. Ce travail présente donc la conception et la synthèse de copolymères biocompatibles visibles par IRM destinés à être introduit dans la composition de proth

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Meehan, Stephen. "Enhancement of polyester properties through molecular design." Thesis, University of Reading, 2012. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.590110.

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The aim of the work described in this thesis was to develop novel semi-crystalline, semi-aromatic polyester-based materials with improved thennal properties relative to their parent polymers, specifically poly(ethylene terephthalate) (PET) and po)y(ethylene-2,6-naphthalate) (PEN). This work involved the design and development of a small-scale (2-10 g) vacuum polyesterification rig, synthesis of a variety of suitable comonomers - both known and unknown - and the synthesis of a range of novel copolymers by incorporating these comanomers through melt-phase polycondensation. Several comonomers wer

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45

Hania, Majid I. M. "Studies on polyester networks and their oligomers." Thesis, Queen's University Belfast, 1997. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.388094.

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46

Hao, Z. "Diffusion studies in polyester and polyamide fibres." Thesis, University of Leeds, 1985. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.355934.

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47

Oener, Erhan. "Thermal characterization of polyester/cellulosic blended materials." Thesis, University of Leeds, 1989. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.329259.

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48

Lamb, D. W. "Processing and properties of polyester moulding compounds." Thesis, University of Liverpool, 1985. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.356276.

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49

Peel, Nicola Elaine. "The effects of laundering on polyester microfibres." Thesis, Manchester Metropolitan University, 2001. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.393283.

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White, Roger John. "Environmental creep mechanisms in glass/polyester composites." Thesis, University of Bath, 1985. https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.353403.

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A previous study, looking at the creep-rupture behaviour of mixed reinforcement GRP when immersed in water, had discovered that low loads, behaviour became temperature sensitive. Since the recorded time to failure of a sample was reduced at elevated temperatures, from that predicted by a linear extrapolation of the short term creep-rupture results, this deviation caused problems in the accurate prediction of long-term design stresses. In order to improve the accuracy of long term design predictions, it was decided to study the mechanisms of creep in GRP that initiates time dependent failure. F

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