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Dissertations / Theses on the topic 'Polyester hydrolysis'

Author: Grafiati

Published: 2 June 2025

Last updated: 31 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

Björquist, Stina. "Separation for regeneration : Chemical recycling of cotton and polyester textiles." Thesis, Högskolan i Borås, Akademin för textil, teknik och ekonomi, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:hb:diva-12388.

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In 2015, 96.7 million tonnes of textile fibres were produced world-wide. Our high consumption of textiles leads to an increased amount of textile waste. In Sweden, the majority of used clothing and textiles are incinerated due to the lack of recycling techniques. A large amount of post-consumer textile waste is made from blended materials. One of the most common blends, used in as near as all workwear and service textiles, is cotton/polyester. To enable chemical recycling of such textiles, cotton and polyester must first be separated. The aim of this thesis was to separate the materials by dep

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3

Schmidt, Juliane, Ren Wei, Thorsten Oeser, et al. "Effect of Tris, MOPS, and phosphate buffers on the hydrolysis of polyethylene terephthalate films by polyester hydrolases." Universitätsbibliothek Leipzig, 2016. http://nbn-resolving.de/urn:nbn:de:bsz:15-qucosa-207524.

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The enzymatic degradation of polyethylene terephthalate (PET) occurs at mild reaction conditions and may find applications in environmentally friendly plastic waste recycling processes. The hydrolytic activity of the homologous polyester hydrolases LC cutinase (LCC) from a compost metagenome and TfCut2 from Thermobifida fusca KW3 against PET films was strongly influenced by the reaction medium buffers tris(hydroxymethyl)aminomethane (Tris), 3-(N-morpholino)propanesulfonic acid (MOPS), and sodium phosphate. LCC showed the highest initial hydrolysis rate of PET films in 0.2 M Tris, while the rat

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4

Bollinger, Alexander [Verfasser], Karl-Erich [Gutachter] Jaeger, and Michael [Gutachter] Feldbrügge. "Novel carboxylic ester hydrolases from marine hydrocarbonoclastic bacteria - insights into organic solvent tolerance, substrate promiscuity and polyester hydrolysis / Alexander Bollinger ; Gutachter: Karl-Erich Jaeger, Michael Feldbrügge." Düsseldorf : Universitäts- und Landesbibliothek der Heinrich-Heine-Universität Düsseldorf, 2020. http://d-nb.info/1217480315/34.

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5

Oliveux, Géraldine. "Influence des conditions d'hydrolyse sous-critique sur le recyclage des matériaux composites fibres de verre / résine polyester insaturé : influence des conditions et de la structure de la résine sur les cinétiques réactionnelles." Nantes, 2012. http://www.theses.fr/2012NANT2110.

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Un procédé d’hydrolyse en conditions batch est étudié pour rompre les liaisons ester de résines polyester insaturé et réticulé au styrène, matrices de matériaux composites renforcés de fibres de verre. Des conditions sous-critiques biphasiques apparaissent adaptées compte tenu de la chimie en jeu. La réaction d’hydrolyse suit en effet un mécanisme Aac2 et nécessite donc des conditions favorables à la réalisation de réactions ioniques, à savoir en particulier un produit ionique et une constante diélectrique relative de l’eau suffisants. Elle permet de récupérer en particulier les monomères d’or

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6

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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7

Pullen, Deborah. "The hydrolytic stability of self-reinforcing polyesters." Thesis, Coventry University, 1991. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.279325.

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8

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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9

Bear, Marie-Maud. "Élaboration de poly (β-hydroxyacides) optiquement actifs à architecture controlée : accès par voies chimiques et/ou biologiques". Paris 12, 1998. http://www.theses.fr/1998PA120034.

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Les deux poles conducteurs de notre travail de recherche ont ete la chiralite, parce qu'il est possible a travers elle de controler la structure configurationnelle du polymere et donc certaines de ses proprietes, et les ressources de la biomasse, pour elaborer des polyesters optiquement actifs, pouvant etre degrades par simple hydrolyse, pour des applications de liberation controlee. Pour cela, nous avons emprunte a la nature differents systemes, d'une part un organisme complet, en l'occurrence une bacterie capable de produire des polyesters fonctionnalises et d'autre part, un enzyme extrait d

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10

Lindström, Frida. "Chemical and physical changes in PET fibres due to exhaust dyeing : Issues in thermo-mechanical recycling of dyed PET textiles." Thesis, Högskolan i Borås, Akademin för textil, teknik och ekonomi, 2018. http://urn.kb.se/resolve?urn=urn:nbn:se:hb:diva-14772.

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Polyethylene terephthalate (PET) is the most used fibre in the textile industry. PET is also used in other products, e.g. soft-drink bottles and food packaging. Approximately 60% of the globally produced PET is intended for production of textile fibres and the demand for polyester fibres have steadily increased over the last decade. Yet, most of the recycled PET fibres are produced from discarded bottles and not discarded textiles even though the generation of textile waste is increasing year by year. The importance of finding efficient recycling routes for discarded PET textiles is obvious. I

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11

Belbella, Abdelàaziz. "Contribution à l'étude de la dégradation de vecteurs collodaux polymères constituéd de poly(DL-lactide) et de poly(DL-lactide-CO-glycolide." Paris 11, 1995. http://www.theses.fr/1995PA114815.

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12

Yang, Shaoguang. "Design and Investigation of Polyurethane End-Capped Polyesters with Controlled Hydrolytic Stability." University of Akron / OhioLINK, 2014. http://rave.ohiolink.edu/etdc/view?acc_num=akron1407971721.

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13

Vinnakota, Keerthi. "Chemical Recycling of Poly (Ethylene Terephthalate) and its Co-polyesters with 2, 5-Furandicarboxylic Acid using Alkaline Hydrolysis." University of Toledo / OhioLINK, 2018. http://rave.ohiolink.edu/etdc/view?acc_num=toledo1535106967389994.

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14

Rodriguez, Ortega Edwin. "Hydrolyse de polylactides et de mélanges de polylactide/polyméthacrylate de méthyle." Thèse, Université de Sherbrooke, 2018. http://hdl.handle.net/11143/11848.

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Les polylactides (PLA) sont une famille de polymères biodégradables et biocompatibles de la famille des polyesters aliphatiques. Lorsque le PLA est dans un milieu humide et à une température excédant le 60°C, il se dépolymérise rapidement par hydrolyse, étape préalable à la biodégradation du PLA. Le PLA est utilisé dans le domaine biomédical et dans la fabrication de nombreux produits destinés, entre autres, à l’usage alimentaire tels que des emballages, des ustensiles et de la vaisselle jetable. Cependant, quand des applications à longue durée de vie sont visées, sa dégradation peut devenir u

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15

Berthé, Vincente. "Développement de mélanges à base de polylactide à durée de vie contrôlée. Étude des relations microstructure / propriétés / mise en œuvre." Phd thesis, École Nationale Supérieure des Mines de Paris, 2010. http://pastel.archives-ouvertes.fr/pastel-00677093.

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La thèse s'inscrit dans le cadre d'un programme de recherche global ayant pour objectif de développer des composites à base de polymères biodégradables. L'objectif est de parvenir à contrôler à la fois la durée de vie ainsi que la fragmentation de ces matériaux. Le programme de thèse porte sur plusieurs aspects : <br/>- l'amélioration de la résilience du polylactide (P(L)LA) par incorporation d'agents modifiants au choc ou de biopolymères à faible module d'Young tels que la poly-epsilon-caprolactone (PCL) et le poly-butylène-succinate (PBS). De plus, deux voies de compatibilisation des mélange

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16

Ramirez-Huerta, Mayela Cristina. "Steric and Anchimeric Effects on the Hydrolysis of Oligoesters and their Influence on End-Use Polyurethane Coatings." University of Akron / OhioLINK, 2009. http://rave.ohiolink.edu/etdc/view?acc_num=akron1258662846.

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17

Freyermouth, Floriane. "Etude et modification des propriétés du poly(butylène succinate), un polyester biosourcé et biodégradable." Thesis, Lyon, INSA, 2014. http://www.theses.fr/2014ISAL0009/document.

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Dans le contexte de développement durable actuel, les matériaux biosourcés et biodégradables commencent à prendre une place importante d’un point de vue économique et écologique. L’objectif de remplacer les polyoléfines utilisées actuellement dans des domaines clés tels que l’emballage et l’automobile est cependant difficile car les matériaux « verts » sont rarement aussi performants. Ils présentent en général des lacunes au niveau de leurs propriétés mécaniques et sont sensibles à des dégradations qui limitent leur durée de vie. Le poly(butylène succinate) est un polyester connu depuis longte

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18

鍾瑞芬. "The Study of Hydrolysis and Drug Delivery of Polyester Microspheres." Thesis, 2002. http://ndltd.ncl.edu.tw/handle/12676889766199814603.

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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>90<br>Microspheres of copolymers of DL-lactic acid and glycolic acid (50 vs 50 mole ratio, DLPLG) and copolymers of β-hydroxy-butyric acid and β-hydroxy-valeric acid (88 vs 12 mole ratio, PHB-HV) and blends of above polymers (4 to 1, 1 to 4, weight to weight) were prepared by single emulsion (o/w) method or double emulsion(w1/o/w2) method using sodium oleate or polyvinyl alcohol as surfactant. Microspheres containing bovine serum albumin and above polymers were also prepared with the same method. Microspheres incubating in phosphate buffer saline(pH=7.2) were used

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19

Huang, Shih-wei, and 黃世瑋. "Studies on the Technology of Inhibiting Hydrolysis in Blending Process of Polyester." Thesis, 2009. http://ndltd.ncl.edu.tw/handle/73800134222409465374.

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碩士<br>國立成功大學<br>化學工程學系碩博士班<br>97<br>Three types of functional groups of the chain-extenders were used in this study, including poly(styrene-co-maleic anhydride) with Mw.2000 (SMA1000) and Mw.3800 (SMA3000), commercialized epoxy groups compounds (TOAGOSEI: XG-4030,UG-4070, BASF: adr-4368-cs) and diimide groups compound (Rhein Chemie: Stabaxol P). The intrinsic viscosity and its carboxyl group content of the PET/chain-extenders blended mixtures were measured to determine the molecular weight during the blended process in brabender at high temperature. The intrinsic viscosity of pristine poly(eth

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20

Lin, Chien-chen, and 林建辰. "Synthesis of nano-scale colloidal silica from elemental silicon by hydrolysis, and synthesis of nano-scale inorganic silica/organic polymer core-shell particle as additives by RAFT living free radical polymerizations for unsaturated polyester, vinyl ester." Thesis, 2010. http://ndltd.ncl.edu.tw/handle/40515457249652869763.

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碩士<br>國立臺灣科技大學<br>化學工程系<br>98<br>In the synthesis of the Si-PMA, the nano-scale colloidal silica was obtained by the hydrolysis of elemental silicon. Then silica was reacted with 4-(chloromethyl)phenyltrimethoxysilane to produce benzyl chloride functionalized silica(Si-Cl) first, followed by reacting with BSPA to make BSPA-grafted silica particle (Si-BSPA). Later, Si-BSPA can be use as a media in Si-poly(methyl acrylate)(i.e. Si-PMA) via Reversible Addition-Fragmentation Chain Transfer (RAFT) polymerization. During RAFT polymerization, the CTA will become a dormant specimen which made the p

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21

Liu, Gu-Hao, and 劉家豪. "Synthesis of nano-scale colloidal silica from elemental silicon by hydrolysis, and synthesis of nano-scale inorganic silica/organic polymer core-shell particle as additives by RAFT living free radical polymerizations for unsaturated polyester, vinyl ester." Thesis, 2011. http://ndltd.ncl.edu.tw/handle/77493157132117376181.

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碩士<br>國立臺灣科技大學<br>化學工程系<br>99<br>In the synthesis of the Si-PMA, the nano-scale colloidal silica was obtained by the hydrolysis of elemental silicon. Then silica was reacted with 4-(chloromethyl)phenyltrimethoxysilane to produce benzyl chloride functionalized silica(Si-Cl) first, followed by reacting with BSPA to make BSPA-grafted silica particle (Si-BSPA). Later, Si-BSPA can be use as a RAFT agent to make in Si-poly(methyl acrylate)(i.e. Si-PMA) via Reversible Addition-Fragmentation Chain Transfer (RAFT) polymerization. During RAFT polymerization, the CTA chain transfer agent would become a

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22

Yu, Ya-ting, and 余雅婷. "Synthesis of nano-scale colloidal silica from elemental silicon by hydrolysis, and synthesis of nano-scale inorganicsilica/organic polymer core-shell particle as additives by RAFT living free radical polymerizations for unsaturated polyester, vinyl ester, and epoxy resins." Thesis, 2013. http://ndltd.ncl.edu.tw/handle/74133996909570431842.

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碩士<br>國立臺灣科技大學<br>化學工程系<br>101<br>In the synthesis of the SiO2-PBA-b-PMA and SiO2-PBA-b-P(MA-co-GMA), the nano-scale colloidal silica (15~60nm) was obtained by the hydrolysis of elemental silicon. Then silica was reacted with 4-(chloromethyl)phenyltrimethoxysilane to produce benzyl chloride functionalized silica(SiO2-Cl) first, followed by reacting with BSPA to make BSPA-grafted silica particle (SiO2-BSPA). Later, SiO2-BSPA can be used as a RAFT agent to make SiO2-PBA-b-PMA (or SiO2-PBA-b-P(MA-co-GMA)) via Reversible Addition -Fragmentation Chain Transfer (RAFT) polymerization. During RAFT po

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23

CHEN, YEN-TING, and 陳彥廷. "Synthesis of nano-scale colloidal silica from elemental silicon by hydrolysis, and synthesis of nano-scale inorganic silica/organic polymer core-shell particle as additives by RAFT living free radical polymerizations for unsaturated polyester, vinyl ester, and epoxy resins." Thesis, 2012. http://ndltd.ncl.edu.tw/handle/qc863x.

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碩士<br>國立臺灣科技大學<br>化學工程系<br>100<br>In the synthesis of the Si-PMA and Si-PBA-b-PMA, the nano-scale colloidal silica was obtained by the hydrolysis of elemental silicon. Then silica was reacted with 4-(chloromethyl)phenyltrimethoxysilane to produce benzyl chloride functionalized silica(Si-Cl) first, followed by reacting with BSPA to make BSPA-grafted silica particle (Si-BSPA). Later, Si-BSPA can be used as a RAFT agent to make Si-poly(methyl acrylate) (i.e. Si-PMA) and Si-PBA-b-PMA via Reversible Addition -Fragmentation Chain Transfer (RAFT) polymerization. During RAFT polymerization, the CTA c

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24

Chung, Wan-lun, and 鍾宛倫. "Synthesis of nano-scale colloidal silica from elemental silicon by hydrolysis, and synthesis of polymer-grafted silica nanoparticle and polymer-grafted monomorillonite clay with core-shell structure as low-profile additives and tougheners for unsaturated polyester, vinyl ester, and epoxy resins by RAFT living free radical solution polymerizations." Thesis, 2014. http://ndltd.ncl.edu.tw/handle/58613975785769985529.

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碩士<br>國立臺灣科技大學<br>化學工程系<br>102<br>Synthesis of nano-scale inorganic/organic core-shell particle (CSP) as low-profile additives (LPA) and toughenors for thermoset resins, and their effects on the cured sample morphology, volume shrinkage characteristics and mechanical properties for low-shrink vinyl ester resins (VER) during the cure were investigated. These CSP designated as SiO2-polymer, which contained silica nanoparticle (SNP) as the core and organic polymer as the shell, were synthesized by the Z supported reversible addition-fragmentation chain transfer (RAFT) graft polymerization using

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25

Huang, Hao-Kuan, and 黃豪寬. "Synthesis of nano-scale colloidal silica from elemental silicon by hydrolysis, and synthesis of polymer-grafted silica nanoparticle, polymer-grafted graphene oxide, and polymer-grafted exfoliated graphene nanoplatelet with core-shell structure as low-profile additives and tougheners for unsaturated polyester and vinyl ester resins by RAFT living free radical solution polymerizations." Thesis, 2015. http://ndltd.ncl.edu.tw/handle/29945158148023952847.

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碩士<br>國立臺灣科技大學<br>化學工程系<br>103<br>Synthesis of nano-scale inorganic/organic core-shell particle (CSP) as low-profile additives (LPA) and toughenors for thermoset resins, and their effects on the cured sample morphology, volume shrinkage characteristics and mechanical properties for low-shrink vinyl ester resins (VER) during the cure were investigated. These CSP designated as SiO2-polymer or GO-polymer, the former of which contained silica nanoparticle (SNP) as the core and the latter of which contained graphite oxide(GO) as the cure and both of them with organic polymer as the shell, were

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26

Welzel, Katharina [Verfasser]. "Einfluss der chemischen Struktur auf die enzymatische Hydrolyse von Polyester-Nanopartikeln / von Katharina Welzel." 2003. http://d-nb.info/968015271/34.

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27

Marten, Elke [Verfasser]. "Korrelationen zwischen der Struktur und der enzymatischen Hydrolyse von Polyestern / von Elke Marten." 2000. http://d-nb.info/959804153/34.

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