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Dissertations / Theses on the topic 'Polyurethanes. Polyurethanes Polyurethanes'

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Published: 4 June 2021

Last updated: 15 February 2022

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1

Jung, Changdo. "SYNTHESIS OF THERMOPLASTIC POLYURETHANES AND POLYURETHANE NANOCOMPOSITES UNDER CHAOTIC MIXING CONDITIONS." University of Akron / OhioLINK, 2005. http://rave.ohiolink.edu/etdc/view?acc_num=akron1124809046.

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2

Goodby, Amanda. "Biodegradable thermoplastic polyurethanes." Thesis, Aston University, 2015. http://publications.aston.ac.uk/32134/.

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The overall aim of this work was to investigate the biodegradability of a number of polyurethane elastomers synthesised by different methods and targeted for a specific agricultural purpose in which the polyurethane was required to be degradable in soil after its useful life. Polyurethanes were synthesised commercially using two different methods; a ‘one-shot’ method where all of the reactants were added simultaneously, and a ‘pre-polymer’ method, in which the isocyanate and polyol were reacted together before addition of the chain extender. The effect of the method of synthesis on the rate of

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3

Coote, Alexander Stuart. "Polyurethanes for enzyme immobilisation." Thesis, Imperial College London, 1989. http://hdl.handle.net/10044/1/47386.

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4

Xu, Tong. "UV-Curable Hybrid Polyurethanes." University of Akron / OhioLINK, 2014. http://rave.ohiolink.edu/etdc/view?acc_num=akron1406471515.

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5

Williams, L. K. "Polyurethanes from renewable resources." Thesis, University of Sheffield, 2013. http://etheses.whiterose.ac.uk/4358/.

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A series of polyurethane (PU) and polyurethane-urea (PUU) elastomers derived from a renewable source have been synthesised and characterised extensively. Comparisons have been made to analogous series of elastomers utilising petroleum derived diisocyanates. The renewable elastomers utilised a difuranic diisocyanate (DFDI) derived from furfural, a readily available raw material synthesised from agricultural waste. DFDI was synthesised using a modified version of a published procedure, utilising triphosgene for the formation of the diisocyanate. The reaction kinetics of the diisocyanates used we

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6

Freij-Larsson, Christina. "Surface modification of biomedical polyurethanes." Lund : Dept. of Chemical Engineering II, Lund University, 1996. http://catalog.hathitrust.org/api/volumes/oclc/38985470.html.

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7

Panesar, Satwinder Singh. "Mould release layers for polyurethanes." Thesis, Imperial College London, 1986. http://hdl.handle.net/10044/1/38131.

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8

Peng, Chao. "Cationic Polyurethanes for Antimicrobial Applications." University of Akron / OhioLINK, 2018. http://rave.ohiolink.edu/etdc/view?acc_num=akron1542383983590224.

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9

Porter, Stephen Christopher. "Synthesis, surface characterization, and biointeraction studies of low-surface energy side-chain polyetherurethanes /." Thesis, Connect to this title online; UW restricted, 1999. http://hdl.handle.net/1773/9845.

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10

Lam, Kit Sang. "Biodegradability of waterborne polyurethane and polyurethane : polyacrylate coating materials in soil /." View abstract or full-text, 2008. http://library.ust.hk/cgi/db/thesis.pl?CBME%202008%20LAM.

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11

Zhang, Changhong. "Elastic degradable polyurethanes for biomedical applications." Connect to this title online, 2008. http://etd.lib.clemson.edu/documents/1219848181/.

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12

Mace, Tamara Lee. "Phase segregation study of thermoplastic polyurethanes." Diss., Available online, Georgia Institute of Technology, 2004:, 2003. http://etd.gatech.edu/theses/available/etd-04072004-180051/unrestricted/mace%5ftamara%5fl%5f200312%5fms.pdf.

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13

Wu, Yuguang. "Protein and platelet interactions with polyurethanes /." Thesis, Connect to this title online; UW restricted, 2004. http://hdl.handle.net/1773/8027.

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14

Lam, Kwok Hing. "Some unsaturated, grafted and ionic polyurethanes." Thesis, Imperial College London, 1989. http://hdl.handle.net/10044/1/47529.

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15

Blackwell, Catherine Jayne. "Synthesis and degradation of biodegradable polyurethanes." Thesis, Durham University, 2017. http://etheses.dur.ac.uk/11961/.

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A series of biodegradable star poly(ε-caprolactone) (PCL)-based polyols and PCL-based diisocyanate prepolymers were synthesised and fully characterised. Biodegradable polyurethanes (PUs) were synthesised using star PCL-based polyols and either biodegradable diisocyanate prepolymers 4,4’-methylenebis(phenyl isocyanate) (MDI) or 2,4-toluene diisocyanate (TDI). The resulting polyols, diisocyanate prepolymers and PUs were subjected to enzymatic degradation using lipase for up to 30 days. Chapter 1 is a general introduction to the reactions involved in the syntheses of PU foams and the ring-opening

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16

Khan, Imran. "Environment-induced changes in biomedical polyurethanes." Thesis, University of Cambridge, 2002. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.620709.

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17

Ahmad, Zeeshan. "Synthesis and Novel Processing of Polyurethanes." Thesis, Queen Mary, University of London, 2007. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.485558.

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Polymeric materials have been'' used in a variety of biomedical applications. Although some polymeric materials are more biocompatible than others, there are always some degree of interaction between the material and the host environment. These interactions depend on how the polymers are synthesised and fabricated playing a major role in predicting their long-term behaviour. These factors are directly related to morphological and chemical structUre of these i:.! materials. This study focuses on a class of polymeric material, polyurethanes, and then to prepare a novel materi~l through novel. sy

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18

Toffey, Ackah. "Cure studies of network-forming polyurethanes." Thesis, Virginia Tech, 1993. http://hdl.handle.net/10919/41509.

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The polyhydroxy character of lignocellulosics and their natural abundance make them good candidates for the manufacture of polyurethanes. The cure characteristics of hydroxypropyl-cellulose and hydroxypropyl lignin (HPC and HPL, respectively) with polymeric methylene diphenyl diisocyanate (MDI) was studied via dynamic mechanical thermal analysis (DMTA). HPC/MDI and HPL/MDI resins flow at 30°C and proceed to cure at 50°C. The latter has excellent thermal stability over the former. Crosslinking of HPL and HPC with MDI follow an nth order kinetics, with an order of reaction of 2 and an appare

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19

Chauveau, Cyril. "Non-isocyanate polyurethanes, polyamides and silyl modified polymers synthesized by olefin metathesis : alternative solutions to polyurethane adhesives." Thesis, Rennes 1, 2018. http://www.theses.fr/2018REN1S127.

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Les polyuréthanes (PUs) sont utilisés comme adhésifs depuis des décennies, mais l’utilisation d’isocyanates durant leur synthèse les place aujourd’hui dans la visée de nouvelles réglementations. Dans ces travaux, nous décrivons trois technologies alternatives potentielles aux Pus, basés sur la métathèse d’oléfines. La première technologie repose sur la synthèse de polyuréthanes sans isocyanates (NIPUs) à partir de motifs carbonate de vinylène (VC). Des polyoléfines VC2-téléchéliques ont été synthétisées par polymérisation par ouverture de cycle par métathèse / métathèse croisée (ROMP/CM) de cy

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20

Guney, Aysun. "Composition-property Relationship Of Pcl Based Polyurethanes." Master's thesis, METU, 2012. http://etd.lib.metu.edu.tr/upload/12614253/index.pdf.

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The desirable properties of polyurethanes (PUs) such as mechanical flexibility associated with chemical versatility make these polymers attractive in the development of biomedical devices. In this study, various segmented polyurethanes were synthesized through polymerization reactions between polycaprolactone (PCL) diol or triol and excess hexamethylene diisocyanate (HDI) with varying NCO/OH ratios and the effect of composition on the properties of the resultant polyurethane films were examined. Initially, isocyanate term

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21

Río, Nieto Enrique del. "New polyurethanes from vegetable oil-based polyols." Doctoral thesis, Universitat Rovira i Virgili, 2011. http://hdl.handle.net/10803/31904.

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Los poliuretanos son uno de los materiales poliméricos más usados debido a sus buenas propiedades. Tradicionalmente, los poliuretanos se han sintetizado a partir de derivados del petróleo, sin embargo, teniendo en cuenta motivos de sostenibilidad, se hace necesario desarrollar tecnologías más ecológicas y económicamente viables. En esta tesis se han obtenido poliuretanos con buenas propiedades mecánicas y memoria de forma a partir de polioles basados en aceites vegetales, utilizando diferentes estrategias sintéticas: A partir de oleato de metilo epoxidado, mediante polimerización por apertura

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22

Lenz, Emma. "Ultrasonically assisted preparation of polyurethanes and polylactones." Thesis, University of Bath, 1995. https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.760683.

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23

Wei, Manqing. "Synthesis of Precursors to Non-isocyanate Polyurethanes." Thesis, North Dakota State University, 2018. https://hdl.handle.net/10365/29167.

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Biobased diamines are excellent precursors for the synthesis of non-isocyanate polyurethanes (NIPUs). We have prepared several biobased diamines using three different reactions for their synthesis. In the first method, we have carried out chain elongation of cellulose-derived 2,5-diformylfuran by the Henry reaction followed by reduction of the nitroalkene. Yields of the key step: Hantzsch Ester reduction, were 70-80%. Method two involves the Friedel-Crafts alkylation of furfurylamine with different ketones under acidic conditions. Yields of large-scale alkylation reaction were 60-77%. In meth

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24

Bo, Chong. "Nanohybrids Based on Solid and Foam Polyurethanes." Thesis, University of North Texas, 2015. https://digital.library.unt.edu/ark:/67531/metadc799520/.

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Polymer nanocomposites are a going part of Materials Science and Engineering. These new composite materials exhibit dimensional and thermal stability of inorganic materials and toughness and dielectric properties of polymers. Development of nanocomposites become an important approach to create high-performance composite materials. In this study silica, fly ash, silica nanotubes and carbon black particles have been added to modify polyurethane foam and thermoplastic polyurethanes. It has been found that the addition of silica can diminish the size of foam bubbles, resulting in an increased stif

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25

Zhang, Lizhong. "Physical, mechanical, thermal, and viscoelastic properties of water-blown rigid polyurethane foam containing soy flours /." free to MU campus, to others for purchase, 1998. http://wwwlib.umi.com/cr/mo/fullcit?p9924871.

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26

Nabeth, Bruno. "Relations entre la structure et les proprietés de polyurethanes et polyurethanes acrylates. : Application vernis : : protection des cartes à puces." Lyon, INSA, 1994. http://www.theses.fr/1994ISAL0075.

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Le travail présenté concerne l'étude des propriétés de réseaux polyuréthanes (PU) et polyuréthanes acrylates (PUA) de natures chimiques voisines. Une étude préliminaire des températures de transition vitreuses de copolymères linéaires modèles a tout d'abord été entreprise. Les variations de Tg des deux types de réseaux PU et PUA ont ensuite été décrites en fonction de la composition chimique (pourcentage de segments souples, masses molaires moyenne entre nœuds et concentration en liaisons uréthane). Les hétérogénéités d'ordre statistique dans les réseaux thermodynamiquement homogènes ont permi

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27

Bryson, John Andrew. "Impact response of polyurethane." Pullman, Wash. : Washington State University, 2009. http://www.dissertations.wsu.edu/Thesis/Fall2009/j_bryson_082509.pdf.

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Thesis (M.S. in mechanical engineering)--Washington State University, December 2009.<br>Title from PDF title page (viewed on Feb. 11, 2010). "School of Mechanical and Materials Engineering." Includes bibliographical references (p. 93-95).

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28

Lunn, Matthew D. G. "Development and application of well-defined titanium alkoxide pre-catalysts." Thesis, University of Bath, 2002. https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.250846.

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29

González, Paz Rodolfo Jesús. "Polyurethanes based on fatty acids with improved biocompatibility." Doctoral thesis, Universitat Rovira i Virgili, 2012. http://hdl.handle.net/10803/96663.

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El objetivo principal de esta tesis ha sido el desarrollo de nuevos poliuretanos a partir de ácidos grasos como fuentes renovables, utilizando química “click” en la síntesis de los dioles y polioles correspondientes. La primera parte del trabajo describe la preparación de los monómeros “vía” acoplamiento tiol-eno ó tiol-ino, su caracterización y las propiedades de los poliuretanos sintetizados. Como los polímeros a partir de ácidos grasos provienen de macromoléculas biológicas y pueden ser potencialmente biocompatibles, la segunda parte del trabajo está dirigida a incrementar la biocompatibili

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30

Theron, Jacobus Petrus. "Development of crosslinkable, thermoplastic polyurethanes for cardiovascular prostheses." Thesis, Link to the online version, 2006. http://hdl.handle.net/10019.1/1315.

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31

Wang, Feng. "Polydimethylsiloxane Modification of Segmented Thermoplastic Polyurethanes and Polyureas." Diss., Virginia Tech, 1998. http://hdl.handle.net/10919/30687.

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This thesis addresses the systematic modification of poly(tetramethylene oxide) (PTMO), polyether based segmented thermoplastic polyurethane with a secondary aminoalkyl functional polydimethylsiloxane (PDMS), which was intended to improve the fire resistance of polyurethane systems. The PDMS oligomer was successfully incorporated into the polyurethane backbone via one step solution polymerization. The effect of PDMS content on thermal stability, morphology, surface composition, mechanical properties, and fire resistance of polyurethane was investigated. These polymers displayed a complex two p

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32

Kull, Kenneth. "Synthesis and Characterization of Novel Polyurethanes and Polyimides." Scholar Commons, 2016. http://scholarcommons.usf.edu/etd/6530.

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Four novel high performance soft thermoplastic polyurethane elastomers utilizing methylene bis(4-cyclohexylisocyanate) as a hard segment, 1,4 butanediol as a chain extender and modified low crystallinity carbonate copolymer as a soft segment were synthesized. The samples were characterized by infrared spectroscopy (FTIR), tensile, elongation, hardness, abrasion resistance and atomic force microscopy (AFM). SAXS data shows evidence of an interdomain "center-to-center" distance of 45Å. DSC traces show evidence of one glass transition temperature and a weak melting region. DMA analysis reveals a

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33

Davis, Geoffrey P. "Transparent polyurethanes : synthesis, characterisation and mustard gas resistance." Thesis, Loughborough University, 1987. https://dspace.lboro.ac.uk/2134/11238.

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Transparent Polyurethanes based upon Polycaprolactone and H 12MDIisocyanate (Desmodur W) have been synthesised and tested with regard to permeation by Mustard Gas (HD). Variations in soft segment molecular weight, reaction ratio, and chain extender, as well as the effect of crosslinking have been investigated. It was found that the principal factor governing permeation behaviour was soft segment molecular weight. However as hard segment content increased the determinant role of the soft segment diminished. Morphological Analysis of the synthesised polyurethanes was carried out using DSC, CMI'A

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34

Segura-Velandia, Diana M. "A case-based reasoning methodology to formulating polyurethanes." Thesis, Loughborough University, 2006. https://dspace.lboro.ac.uk/2134/7836.

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Formulation of polyurethanes is a complex problem poorly understood as it has developed more as an art rather than a science. Only a few experts have mastered polyurethane (PU) formulation after years of experience and the major raw material manufacturers largely hold such expertise. Understanding of PU formulation is at present insufficient to be developed from first principles. The first principle approach requires time and a detailed understanding of the underlying principles that govern the formulation process (e.g. PU chemistry, kinetics) and a number of measurements of process conditions

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35

Theiss, Timothy J. "Preliminary investigation into the cracking of polyurethane." Thesis, This resource online, 1987. http://scholar.lib.vt.edu/theses/available/etd-04122010-083619/.

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36

Lind, Pernilla. "Biomarkers of aromatic isocyanates in exposed workers." Lund : Dept. of Occupational and Environmental Medicine, Institute of Laboratory Medicine, Lund University, 1997. http://catalog.hathitrust.org/api/volumes/oclc/39725787.html.

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37

Meade, Lorne E. "Effective elastic modulus of polyurethane asperities." Thesis, Georgia Institute of Technology, 2000. http://hdl.handle.net/1853/15990.

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38

Lancaster, Ian M. "Synthesis, structure and properties of polyurethane-polymethacrylate graft polymers." Thesis, University of Bradford, 1989. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.236472.

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39

Wang, Jinghong. "A study of smoldering combustion in horizontally oriented polyurethane foam layer /." View Abstract or Full-Text, 2002. http://library.ust.hk/cgi/db/thesis.pl?MECH%202002%20WANGJ.

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Thesis (Ph. D.)--Hong Kong University of Science and Technology, 2002.<br>Includes bibliographical references (leaves 154-166). Also available in electronic version. Access restricted to campus users.

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40

Yelisetty, Satya Suresh. "Modeling and experimentation of polyol + blowing agent systems a thesis presented to the faculty of the Graduate School, Tennessee Technological University /." Click to access online, 2008. http://proquest.umi.com/pqdweb?index=54&sid=1&srchmode=1&vinst=PROD&fmt=6&startpage=-1&clientid=28564&vname=PQD&RQT=309&did=1605147071&scaling=FULL&ts=1251389293&vtype=PQD&rqt=309&TS=1251389306&clientId=28564.

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41

Lee, Yein-ming Leo. "Fundamental studies in reactive processing of polyurethane based polymerizations /." The Ohio State University, 1986. http://rave.ohiolink.edu/etdc/view?acc_num=osu1487322984316763.

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42

Lau, Soo-Khim. "The structure-property relationships of urethane-acrylic thermosetting systems." Thesis, Loughborough University, 1995. https://dspace.lboro.ac.uk/2134/27415.

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Urethane-acrylic copolymers have found increasing use as a radiation curable materials in the recent years. These copolymers are highly crosslinked through the use of acrylic monomers having more than one double bond. Stirling Lloyd had discovered such materials to be a successful alternative to the urethane or acrylics coatings as waterproof membrane coatings. In this project, structure-property relationships of UA copolymer systems were studied. These were peroxide cured at room temperature.

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43

Kirschbaum, Stefan [Verfasser]. "Vinyl ether functional polyurethanes as novel photopolymers / Stefan Kirschbaum." Mainz : Universitätsbibliothek Mainz, 2017. http://d-nb.info/1125907592/34.

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44

McMillan, Robin. "Peptide modified gold coated polyurethanes as biosynthetic vascular prostheses." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1998. http://www.collectionscanada.ca/obj/s4/f2/dsk2/tape17/PQDD_0001/MQ36721.pdf.

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45

Zhang, Changhong. "Synthesis and characterization of biodegradable polyurethanes for biomedical application." Connect to this title online, 2009. http://etd.lib.clemson.edu/documents/1263395123/.

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46

Bossion, Amaury. "New challenges in the synthesis of non-isocyanate polyurethanes." Thesis, Bordeaux, 2018. http://www.theses.fr/2018BORD0360/document.

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Parmi tous les plastiques, les polyuréthanes (PUs) représentent la sixième classe de polymères la plus utilisée au monde. Ils sont synthétisés industriellement par réaction entre un diol et un diisocyanate, en présence d'un catalyseur métallique et d’un solvant organique.Néanmoins, cette synthèse présente d’importants problèmes environnementaux et de santé.Afin de s’affranchir de ces composés toxiques, les progrès dans ce domaine ont conduit à un certain nombre de procédés sans isocyanates. Néanmoins, ces procédés doivent faire face à de nombreux défis (propriétés physiques, masses molaires, r

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47

Zemach, Kenneth David. "Segmented polyurethanes containing diacetylene units in multiple molecular environments." Thesis, Massachusetts Institute of Technology, 1995. http://hdl.handle.net/1721.1/39050.

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48

Sun, Zhan. "X-ray analysis of structures of polyurethanes and copolyesters." Case Western Reserve University School of Graduate Studies / OhioLINK, 1990. http://rave.ohiolink.edu/etdc/view?acc_num=case1059072340.

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49

Liu, Xiaohong. "Synthesis and Characterization of Carbohydrate-conjugated Polyesters and Polyurethanes." University of Akron / OhioLINK, 2018. http://rave.ohiolink.edu/etdc/view?acc_num=akron1491433530882435.

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50

Li, Zhuoran. "Synthesis and Characterization of Functionalized Polyurethanes with Hydrophilic Moieties." University of Akron / OhioLINK, 2018. http://rave.ohiolink.edu/etdc/view?acc_num=akron1522851826350018.

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