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Dissertations / Theses on the topic 'Cationic polymerization'

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Published: 4 June 2021
Last updated: 25 May 2024

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1

Endsor, Robert M. "Living cationic polymerization." Thesis, Aston University, 1997. http://publications.aston.ac.uk/9597/.

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The kinetics of the polymerization of styrene iniated by 1-chloro-1-phenyltehane/tin (IV) chloride in the presence of tetrabutylammonium chloride have been studied. Dilatometry studies at 25 °C were conducted and the orders of reaction were established. Molecular weight studies were conducted for these experiments using size exclusion chromatography. These studies indicated that transfer/termination reactions were present. The observed kinetics may be explained by a polymerization mechanism involving a single propagating species which is present in low concentrations. Reactions at 0 °C and -15
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2

Hajime, Kammiyada. "Ring-Expansion Cationic Polymerization：A New Precision Polymerization for Cyclic Polymers." 京都大学 (Kyoto University), 2017. http://hdl.handle.net/2433/225628.

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3

Tapper, Tristan T. "Living cationic polymerization of isobutene." Thesis, Aston University, 1999. http://publications.aston.ac.uk/9621/.

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The polymerization of isobutene initiated by 1-chloro-1-phenylethane has been investigated, and molecular weight studies conducted using size exclusion chromatography. Polymerizations carried out in a 40/60 (v/v) mixture of dichloromethaneIcyclohexane, using titanium (IV) chloride as a catalyst in the presence of pyridine at -30 °C were found to be controlled and living. The number average molecular weights of the polymers increased linearly with monomer conversion, and the molecular weight distributions were between 1.15 and 1.20. Efficiencies of initiation were between 80 and 100%, and evide
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4

Ma, Yinghua. "Living cationic polymerization of styrene monomers." Thesis, Aston University, 2000. http://publications.aston.ac.uk/9636/.

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This thesis describes an experimental investigation of synthesis of polystyrene under various polymerization conditions such as solvent polarity, temperature, initial concentrations of initiator, catalyst, monomer and added salts or co-catalyst, which was achieved using the living cationic polymerization technology in conjunction with gel permeation chromatography (GPC) and NMR spectroscopy. Polymerizations of styrene were conducted using 1-phenyl ethylchloride (1-PEC) as an initiator and tin tetrachloride (SnCI4) as a catalyst in the presence of tetra-n-Butylammonium chloride (nBu4NCI). Effec
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5

Amer, Laila I. "Interfacial cationic polymerization and its application in microencapsulation." Thesis, University of Strathclyde, 1990. http://oleg.lib.strath.ac.uk:80/R/?func=dbin-jump-full&object_id=21162.

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Direct polymerization on the solid surfaces of three crystalline biologically active drugs has been carried out in this study to provide a thin polymer film (capsule wall) around the crystals. This polymer film would act as a release controlling layer of the encapsulated crystals into a surrounding fluid. To date there has not been to our knowledge, any study of release control by the encapsulation of solids by direct polymerization. This thesis describes a new technique based on solid/liquid interfacial cationic polymerization which was carried out in an entirely non-aqueous medium to encapsu
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6

Gouardères, Frédéric P. "The cationic ring-opening polymerization of cyclic ethers." Thesis, Aston University, 1995. http://publications.aston.ac.uk/9681/.

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The kinetics and mechanisms of ring opening polymerization and copolymerizntion of different cyclic ethers were studied using mainly a cationic system of iinitiation. BF30Et2/ethanediol. The cyclic ethers reacted differently showing that ring strain and basicity are the main driving forces in cationic ring opening polymerizaion. In most cases it was found that the degree of polymerization is controlled kinetically via terminations with the counterion and the monomers, and that the contribution of each type of reaction to the overall termination differs markedly. The Gel permeation chromatograp
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7

Gupta, M. K. "Photo and thermo latent initiators for cationic polymerization." Thesis(Ph.D.), CSIR-National Chemical Laboratory, Pune, 2008. http://dspace.ncl.res.in:8080/xmlui/handle/20.500.12252/2655.

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8

Aoshima, Sadahito. "Syntheses of Functional Polymers by Cationic Polymerization: Living Polymerization and Controlled Chain Transfer." Kyoto University, 1986. http://hdl.handle.net/2433/74688.

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9

Kesharwani, Tanay. "Studies in electrophilic cyclization, palladium migration and cationic polymerization." [Ames, Iowa : Iowa State University], 2008. http://gateway.proquest.com/openurl?url_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:dissertation&res_dat=xri:pqdiss&rft_dat=xri:pqdiss:3330842.

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10

Sato, Kotaro. "CATIONIC POLYMERIZATION IN AQUEOUS MEDIA WITH WATER-TOLERANT LEWIS ACIDS." Kyoto University, 2000. http://hdl.handle.net/2433/151505.

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11

Yilmaz, Seda. "Long Wavelength Photosensitizers With Benzotriazole And Benzimidazole Skeletons For Cationic Polymerization." Master's thesis, METU, 2011. http://etd.lib.metu.edu.tr/upload/12613457/index.pdf.

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Benzimidazole and benzotriazole derivatives, 4-(2,3-Dihydrothieno[3,4-b][1,4] dioxin-5-yl)-7-(2,3-dihydrothieno[3,4b][1,4]dioxin-7-yl)-2-benzyl-1H-benzo[d] imidazole (BIm-Ed), 2-benzyl-4,7-di(thiophen-2-yl)-2H-benzo[d] [1,2,3] triazole (BBTS), and 2-benzyl-4,7-bis(2,3-dihydrothieno[3,4-b][1,4]dioxin-5-yl)-2Hbenzo[ d] [1,2,3] triazole (BBTES) were employed as photosensitizers for diaryliodonium salt photoinitiators in cationic photopolymerization of various epoxide and vinyl ether monomers. Diphenyliodonium hexafluorophosphate (Ph2I+PF6&macr<br>) salt was used as the photoinitiator in this stud
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12

Katayama, Hiroshi. "SPECTROSCOPIC DIRECT ANALYSIS OF THE GROWING SPECIES IN LIVING CATIONIC POLYMERIZATION." 京都大学 (Kyoto University), 2001. http://hdl.handle.net/2433/150248.

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13

Shohi, Hajime. "SYNTHESIS OF TELECHELIC AND TRI-ARMED POLYMERS BY LIVING CATIONIC POLYMERIZATION." Kyoto University, 1992. http://hdl.handle.net/2433/168764.

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本文データは平成22年度国立国会図書館の学位論文(博士)のデジタル化実施により作成された画像ファイルを基にpdf変換したものである<br>Kyoto University (京都大学)<br>0048<br>新制・論文博士<br>博士(工学)<br>乙第7878号<br>論工博第2588号<br>新制||工||878(附属図書館)<br>UT51-92-K378<br>(主査)教授 東村 敏延, 教授 今西 幸男, 教授 宮本 武明<br>学位規則第4条第2項該当
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14

Chang, Chen. "Synthesis and polymerization of spiro-orthoesters catalyzed by a cationic indium complex." Thesis, University of British Columbia, 2017. http://hdl.handle.net/2429/61541.

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While numerous neutral indium complexes have been reported to be functional group tolerant Lewis acid catalysts for various transformations, there are only a handful of reported cationic indium complexes; these are mostly inactive in catalytic transformations. Herein, I describe the synthesis and characterization of a rare cationic indium alkyl complex bearing a chiral tridentate ligand, [(NNO)In(CH₂SiMe₃)(THF)][BArF] (30). Complex 30 is active towards reaction of 1,2-epoxy-7-octene and ε-caprolactone to form the corresponding spiro-orthoes
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15

Ireland, Benjamin John, and University of Lethbridge Faculty of Arts and Science. "Cationic organomagnesium complexes as homogeneous catalysts for the ring-opening polymerization of lactones." Thesis, Lethbridge, Alta. : University of Lethbridge, Dept. of Chemistry and Biochemistry, c2009, 2009. http://hdl.handle.net/10133/2513.

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Polylactones are biodegradable polymers which may be used as alternatives to conventional plastics and have shown promise in novel medical applications. Industrial production of polylactones requires the use of a catalyst. The work described herein is directed toward the development of novel cationic magnesium-based lactone-polymerization catalysts. These cationic species are produced by alkide abstraction from a neutral precursor; a strategy which has seen only preliminary exploration in the context of lactone polymerization. The target catalyst system features a neutral phosphinimine-deriva
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16

Matuszczak, Stephen. "An investigation of the photoinitiated cationic cross-linking polymerization of some epoxy resins." Thesis, Durham University, 1987. http://etheses.dur.ac.uk/6705/.

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As well as dealing with general topics pertinent to the project, the first chapter gives the aims of the project and reviews the theories of network formation. Particular attention is paid to the occurrence of inhomogeneous cross-linking in nonlinear chain-growth polymerizations. The second chapter reviews an important aspect of photoinitiated polymerizations, namely the photochemistry of the photoinitiator used, in this case diphenyliodonium hexafluorophosphate. The preparation and characterization of the photoinitiator and the characterization of the commercial monomers are given in chapter
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17

Wöckel, L., A. Seifert, C. Mende, I. Roth-Panke, L. Kroll, and S. Spange. "Resin and carbon foam production by cationic step-growth polymerization of organic carbonates." Universitätsbibliothek Chemnitz, 2017. http://nbn-resolving.de/urn:nbn:de:bsz:ch1-qucosa-220096.

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Acid induced step-growth polymerizations of bis(p-methoxybenzyl) carbonate (pMBC), bis(m-methoxybenzyl) carbonate (mMBC) and difurfuryl carbonate (DFC) have been performed to produce resin-foams, because controlled release of carbon dioxide takes place during polymerization of those organic carbonates. The monomers are polymerized in bulk using p-toluene sulfonic acid (pTS) as a catalyst. The volume development of the foams is assisted by use of an appropriate surfactant and the crosslinking agent 1,3,5-trioxane as co-components. A portion of carbon dioxide release is a function of the carbeni
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18

Wheaton, Craig Andrew. "The development of cationic zinc complexes as a new class of lactide polymerization catalyst." Thesis, Lethbridge, Alta. : University of Lethbridge, Dept. of Chemistry and Biochemistry, 2011, 2011. http://hdl.handle.net/10133/3108.

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The thesis outlines the development of novel cationic zinc complexes for application in lactide polymerization catalysis. These complexes were characterized spectroscopically and crystallographically, and where appropriate their efficacy as catalysts for the polymerization of lactide was evaluated. The strongly donating, neutral chelating ligands employed in this study were prepared by installation of either one or two phosphinimine donors on a dibenzofuran backbone. An efficient synthetic methodology was then developed for the synthesis of cationic complexes of the formula [LZ
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19

Mehrkhodavandi, Parisa 1976. "Living α-olefin polymerization by cationic zirconium and hafnium complexes containing chelating diamidopyridine ligands". Thesis, Massachusetts Institute of Technology, 2002. http://hdl.handle.net/1721.1/16887.

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Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Chemistry, 2002.<br>Vita.<br>Includes bibliographical references (leaves 196-199).<br>This electronic version was submitted by the student author. The certified thesis is available in the Institute Archives and Special Collections.<br>by Parisa Mehrkhodavandi.<br>Ph.D.
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20

Sagane, Toshihiro. "SYNTHESES OF AMORPHOUS POLYMERS WITH RIGID MAIN-CHAIN OR PENDANT STRUCTURES BY CATIONIC POLYMERIZATION." Kyoto University, 1993. http://hdl.handle.net/2433/168866.

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本文データは平成22年度国立国会図書館の学位論文(博士)のデジタル化実施により作成された画像ファイルを基にpdf変換したものである<br>Kyoto University (京都大学)<br>0048<br>新制・論文博士<br>博士(工学)<br>乙第8056号<br>論工博第2655号<br>新制||工||897(附属図書館)<br>UT51-93-B328<br>(主査)教授 東村 敏延, 教授 今西 幸男, 教授 山本 雅英<br>学位規則第4条第2項該当
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21

O'Connor, Abby R. Brookhart Maurice S. "Reactions of cationic allylNiII complexes with 1,3-dienes and olefins polymerization and mechanistic studies /." Chapel Hill, N.C. : University of North Carolina at Chapel Hill, 2008. http://dc.lib.unc.edu/u?/etd,2328.

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Thesis (Ph. D.)--University of North Carolina at Chapel Hill, 2008.<br>Title from electronic title page (viewed Jun. 26, 2009). " ... 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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22

Mora, Sandeep. "Accelerating enzymatic hydrolysis of cornstarch and cellulose using cationic polymers." Diss., Georgia Institute of Technology, 2013. http://hdl.handle.net/1853/50229.

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The effect of cationic polymers on the rate of hydrolysis of cornstarch and cellulosic feedstocks was investigated. Poly(diallyldimethylammonium chloride) (p-DADMAC) and cationic polyacrylamides (c-PAMs) were used in the study. Experiments were performed to analyze the effect of both p-DADMAC and c-PAM on cornstarch liquefaction. Measurements were also made on the hydrolysis rates of bleached softwood to determine the mechanism through which cationic polymers accelerate cellulosic hydrolysis. Additional experiments were performed to study the effect of cationic polymers on different lignocellu
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23

Lee, Jihean Palmese Giuseppe R. "Cationic polymerization of glycidyl ethers and furans : improved electron beam and UV cured epoxy networks /." Philadelphia, Pa. : Drexel University, 2007. http://hdl.handle.net/1860/2538.

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24

Kingsley, Kyle. "Features of Highly Hydrophobic Plant Oil-Based Vinyl Monomers in Cationic and Free Radical Polymerization." Diss., North Dakota State University, 2019. https://hdl.handle.net/10365/29456.

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The demand for polymeric materials, which have traditionally been produced from petroleum-based resources over the last century, continues to grow each year. However, the supply of fossil fuels is limited. This, along with price volatility, harmful effects on the environment, and stricter regulations, have led to a surge in the exploration of suitable replacements, namely renewable resources such as plant and vegetable oils. In this work, newly synthesized highly hydrophobic plant oil-based vinyl monomers were polymerized using different mechanisms and processes to obtain polymer coatings and
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25

Jiang, Bo. "Homo- and co-polymerization of disubstituted ketenes." Thesis, Normandie, 2019. http://www.theses.fr/2019NORMIR02/document.

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Ce travail vise à synthétiser avec un rendement satisfaisant de nouvelles architectures de polymères à hautes performances, possédant une structure définie et une bonne fenêtre de transformation, sur la base de cétènes aliphatiques ou aromatiques disubstitués. Les synthèses de diméthylcétène (DMK), méthyléthylcétène (MEK), diéthylcétène (DEK), éthylphénylcétène (EPK) et diphénylcétène (DPK) ont été étudiées. Puis l’homo- et la copolymérisation de ces monomères avec différents amorceurs ont été étudiées. L’influence de l’encombrement stérique présent sur les cétènes influence grandement leur ré
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26

Yang, Ning. "Polystyrene-based cationic copolymers : a study of their synthesis, characterization, and sizing mechanism." Diss., Georgia Institute of Technology, 2002. http://hdl.handle.net/1853/7074.

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27

Sacristán, Benito Marta. "Soybean oil based copolymers containing silicon, boron or phosphorus: polymerization, characterization and fire retardance properties." Doctoral thesis, Universitat Rovira i Virgili, 2010. http://hdl.handle.net/10803/9040.

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Introducción y antecedentes <br/>El concepto de desarrollo sostenible surgió como idea principal tras la reunión de la comisión Brundtland en 1987. Esta reunión fue organizada por Naciones Unidas con el fin de tratar el deterioro del medio ambiente, originado por el desarrollo descontrolado de la humanidad. El desarrollo sostenible fue definido como un avance social y económico que asegure una vida sana y productiva al ser humano, pero que no comprometa las posibilidades de desarrollo de las generaciones venideras. Entre las conclusiones alcanzadas, se resaltó la necesitad de disponer de una m
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Quattrosoldi, Silvia. "Dithienopyrrole-based materials: development of new polymeric derivatives." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2017. http://amslaurea.unibo.it/14406/.

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The possibility to control molar mass and termination of the growing chain is fundamental to create well-defined, reproducible materials. For this reason, in order to apply polydithienopyrrole (PDTP) as organic conjugated polymer, the possibility of controlled polymerization needs to be verified. Another aspect that is still not completely explored is bound to the optical activity of the PDTP, which bearing appropriate substituents may adopt a helical conformation. The configuration of the helix, built up from achiral co-monomers, can be established in an enantiopure way by using only a small
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29

Cooper, Alan Thomas. "Mechanistic studies on the role of cationic palladium hydride initiators in addition polymerization of exo-and endo-functionalized norbornenes." Thesis, Durham University, 2008. http://etheses.dur.ac.uk/2219/.

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The key bicyclic carbons within the monomer structures displayed no regular or consistent trends in (^13)C NMR signal shifts, upon the methylene spacing of the –CO(_2)TMS, -OMe, -NHSO(_2)CF(_3) and –Oac functionalities. Theoretical calculations are performed on isolated molecules of endo- and exo-NB-(CH(_2))(_n)C0(_2)H, where n = 0, 1 and 2, using the Gaussian 03 program, to rationalise the effects of introducing methylene spacers between norbornene and its functional group. The relationships between polymerisation activity and bond lengths, bond angles and Mulliken atomic charges are examined
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30

Karakawa, Makoto. "Chemical Synthesis of High-Regioselectively Methylated Celluloses by a Cationic Ring-Opening Polymerization and Some of Their Solution Properties." Kyoto University, 2003. http://hdl.handle.net/2433/148984.

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Kyoto University (京都大学)<br>0048<br>新制・課程博士<br>博士(農学)<br>甲第10258号<br>農博第1330号<br>新制||農||867(附属図書館)<br>学位論文||H15||N3779(農学部図書室)<br>UT51-2003-H679<br>京都大学大学院農学研究科森林科学専攻<br>(主査)教授 中坪 文明, 教授 松本 孝芳, 教授 西尾 嘉之<br>学位規則第4条第1項該当
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Proxmire, Paul R. "The influence of aluminum salts on the retention of titanium dioxide when using cationic polyelectrolyte as a retention aid." Diss., Georgia Institute of Technology, 1988. http://hdl.handle.net/1853/5533.

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Kolay, Merve. "Dibenzophenazine And Quinoxaline Derivatives As Novel Visible Photosensitizers For Diaryliodonium Salts." Master's thesis, METU, 2011. http://etd.lib.metu.edu.tr/upload/12613419/index.pdf.

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This study is focused on the use of visible light in photoinitiated cationic polymerization. Photoinitiated polymerization of oxiranes, vinyl ethers, and other vinyl monomers was achieved. In doing so, (2-(2,3 dihydrobenzo [b][1,4]dioxin-6-yl)-3-(2,3-dihydrobenzo[b]-[1,4]dioxin-7-yl)-5-(2,3-dihydrothieno[3,4-b][1,4]dioxin-5-yl)-8-(2,3-dihydrothieno[3,4-b][1,4]dioxin-7yl) quinoxaline) (DBQEd) and poly(2,3,5,8-tetra(thiophen-2-yl)quinoxaline) (TTQ), two dibenzo[a,c]phenazine derivatives<br>10,13-bis(2,3-dihydrothieno[3,4-b][1,4]dioxin-5-yl)dibenzo[a,c] phenazine (PHED) and 10,13-bis(4-hexylthiop
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Nzulu, Frida. "Développement de procédés de polymérisation catalysés par des complexes d'or." Thesis, Paris 6, 2015. http://www.theses.fr/2015PA066445.

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Ces travaux de thèse ont pour but de développer des procédés de polymérisation efficaces catalysés par des complexes organométalliques à base d'or. Dans une première partie, nous avons développé un nouveau procédé de polymérisation par polyaddition faisant intervenir des carbènes d'or formés par réaction de cycloisomérisation d'esters propargyliques catalysée par un complexe d'or carbophile. Des structures polymères originales et inédites composées d'un motif de répétition phényle vinylcyclopropane ont été proposées. Cette méthodologie a été appliquée à une variété d'esters propargyliques, tou
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Le, Bohec Maël. "PEGylated cationic polyacrylates for transfection : synthesis, characterization, DNA complexation and cytotoxicity." Thesis, Le Mans, 2017. http://www.theses.fr/2017LEMA1027/document.

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Le développement de la thérapie génique dépend des systèmes utilisés pour le transport de gènes vers les cellules eucaryotes. Les systèmes à base de virus sont les plus efficaces. Cependant, il est urgent de trouver une alternative à de tels systèmes viraux pathogènes et oncogènes. Les polymères cationiques sont des vecteurs synthétiques prometteurs ; toutefois, une question cruciale reste en suspens : quelle structure de polymère cationique visée pour une efficacité de transfection élevée et une faible cytotoxicité ? Face à ce questionnement scientifique, de nouveaux polymères cationiques off
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Zhao, Chenying. "SYNTHESIS AND FUNCTIONALIZATION OF HYPERBRANCHED POLY(METHYL METHACRYLATE)." University of Akron / OhioLINK, 2019. http://rave.ohiolink.edu/etdc/view?acc_num=akron1556104656335921.

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Marechal, David. "Polymérisation cationique photo-thermique de résines époxydes." Thesis, Mulhouse, 2013. http://www.theses.fr/2013MULH8378.

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Le groupe Mäder s’est lancé depuis quelques années dans une nouvelle thématique, la polymérisation « dual-cure ». Il s’agit d’un processus photo-thermique couplant réactivité photochimique et thermique. Cette thématique vise des applications pour lesquelles le produit est épais et/ou fortement chargé. La photopolymérisation étant limitée en profondeur, le processus thermique permet de compléter la polymérisation au coeur de l’échantillon ou encore dans les zones non accessibles par la technologie UV/LED. Cette thématique a fait l’œuvre d’une première thèse (2007-2010) menée par le doctorant Ad
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Hayki, Najib. "Synthèse et caractérisation de nouveaux polymères obtenus à partir de l'éthylcétène." Phd thesis, INSA de Rouen, 2011. http://tel.archives-ouvertes.fr/tel-00633323.

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L'objectif de cette étude est de synthétiser de nouveaux polymères aux propriétés spécifiques, en utilisant pour la première fois comme monomère un aldocétène : l'éthylcétène. La synthèse de l'éthylcétène a été entreprise en utilisant deux procédés distincts :d'une part la méthode de McCarney, qui a permis de le préparer dans un solvant par entraînement à la vapeur, et d'autre part le craquage de l'anhydride butyrique à 575°C sous 40mbar.La polymérisation ionique de l'éthylcétène a ensuite été réalisée, dans différentes conditions de solvant, de température et avec plusieurs amorceurs. La poly
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Corakci, Bengisu. "Substituted Quinoxaline And Benzimidazole Containing Monomers As Long Wavelength Photosensitizers For Diaryliodonium Salt Initiators In Photopolymerization." Master's thesis, METU, 2013. http://etd.lib.metu.edu.tr/upload/12615458/index.pdf.

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In this study<br>ferrocenyl and naphthalenyl substituted quinoxaline derivatives<br>5,8- bis (2,3- dihydrothieno [3,4-b] [1,4] dioxin-5-yl)-2- (naphthalen-2-yl)- 3- ferrocenyl- 4a,8a-dihydroquinoxaline<br>5,8- bis (2,3-dihydrothieno [3,4-b] [1,4]dioxin-5-yl) -2- (phenyl) -3-ferrocenylquinoxaline<br>5,8-bis (2,3-dihydrothieno [3,4-b] [1,4]dioxin-5-yl) -2,3- di(naphthalen-2-yl)quinoxaline and trihexylthiophene and thiophene coupled benzimidazole derivatives<br>4-(tert-butyl)-4,7-bis(4-hexylthiophen-2-yl)spiro[benzo[d]imidazole-2,1-cyclohexane] and 4-(tert-butyl)-4, 7-bis(thiophenyl)spiro[benzo[d
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Chavan, Vijay S. "Controlled Synthesis and Characterization of Branched, Functionalized, and Cyclic Polymers." University of Akron / OhioLINK, 2011. http://rave.ohiolink.edu/etdc/view?acc_num=akron1304550167.

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Troeltzsch, Christina. "Controlled/living polymerizations : a. synthesis of block copolymers with bicyclic acetals by cationic ring opening polymerization : b. synthesis and study of tetradentate ligands coordinated to Cu(I) and Cu(II) for use as ATRP catalysts /." For electronic version search Digital dissertations database. Restricted to UC campuses. Access is free to UC campus dissertations, 2003. http://uclibs.org/PID/11984.

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Higgins, Bernadette Ann. "Carbon Nanofiber-Polymer Composites for Electronic Applications." University of Akron / OhioLINK, 2006. http://rave.ohiolink.edu/etdc/view?acc_num=akron1143655787.

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42

Vautrin-Ul, Christine. "Polymérisation cationique du penta-1,3-diène et copolymérisation avec l'isobutène : contribution à la synthèse de nouveaux copolymères triblocs." Vandoeuvre-les-Nancy, INPL, 1996. http://www.theses.fr/1996INPL082N.

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Cette étude est consacrée à la polymérisation cationique du penta-1,3-diène ou pipérylène (PD) et à sa copolymérisation avec l'isobutène (IB), l'objectif principal étant la préparation de copolymères triblocs constitués d'une séquence centrale élastomère polyisobutène et de deux segments rigides de type poly(penta-1,3-diène) partiellement cyclisé. La première partie de ce travail traite de la polymérisation cationique de chacun des isomères cis et trans du penta-1,3-diène et d'un pipérylène technique (mélange cis/trans: 45/55) contenant 10% d'impuretés (hydrocarbures en C5). Une analyse complè
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43

Celebi, Oguzhan. "Synthesis and Characterization of Poly(2-Ethyl-2-Oxazoline) Functional Prepolymers and Block Copolymers." Diss., Virginia Tech, 2014. http://hdl.handle.net/10919/24908.

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This dissertation focuses on the synthesis and characterization of functional poly(2-ethyl-2-oxazoline) (PEtOx) containing homo- and block copolymers that are potential materials for membrane-based water purification and gas separation, drug delivery, magnetic resonance imaging and tissue engineering applications. The polymerization of 2-ethyl-2-oxazoline (EtOx) was investigated with regard to the effects of initiator structures and reaction parameters such as polymerization time and temperature on molecular weight control and molecular weight distribution, endgroup functionality, living char
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44

Benaoudia, Dihia. "Fonctionnalisation chimique de membranes nanoporeuses pour la mise en oeuvre de filtres commutatifs." Thesis, Sorbonne Paris Cité, 2018. http://www.theses.fr/2018USPCC237.

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La filtration est un processus clé dans différentes industries telles que l’industrie chimique, alimentaire, biologique et le traitement des eaux. Il est donc crucial de trouver un moyen moins onéreux, efficace, et rapide pour récupérer les matériaux et molécules usagés. Les problèmes liés à la filtration sont très nombreux et peuvent être soit liés à la taille et la nature des objets à filtrer (molécules, virus, particules, cellules vivantes…), soit liés à la nature du filtre (papier, sable, céramique, membranes). Dans ce projet nous allons essentiellement nous intéresser à l’élaboration de f
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Le, fer Gaëlle. "Nouvelles architectures de polymères à base de poly(2-méthyl-2-oxazoline) pour l'élaboration de nanoparticules destinées à la vectorisation." Thesis, Paris Est, 2015. http://www.theses.fr/2015PESC1174.

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Ce sujet s'inscrit dans le domaine de la vectorisation de médicaments et de la nanomédecine, un domaine en pleine expansion. Les nanovecteurs destinés à la santé doivent être stables, non-toxiques et furtifs vis-à-vis du système immunitaire pour pouvoir circuler librement dans le sang. C'est pourquoi il est nécessaire d'élaborer des polymères pouvant former des nanoparticules possédant un caractère furtif. Le poly(acide lactique) (PLA) est un polyester hydrophobe et biodégradable couramment utilisé pour former des nanoparticules (NPs) capables d'encapsuler des composés apolaires. Le poly(2-mét
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Ohgi, Hiroyuki. "Studies on Synthesis and Physical Properties of Highly Isotactic Poly(vinyl alcohol) Derived from Poly(tert-butyl vinyl ether)." 京都大学 (Kyoto University), 2007. http://hdl.handle.net/2433/57290.

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Leal, Fernanda Barbosa. "Síntese de monômeros siloxano-oxiranos para aplicação em Odontologia." Universidade Federal de Pelotas, 2012. http://repositorio.ufpel.edu.br/handle/ri/2281.

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Made available in DSpace on 2014-08-20T14:30:15Z (GMT). No. of bitstreams: 1 Dissertacao_Fernanda_Barbosa_Leal.pdf: 806160 bytes, checksum: 37717162c453100433c520a8c9d199ef (MD5) Previous issue date: 2012-12-19<br>The aim of this study was synthesize, characterize and photopolymerize an alternative monomers for use in dentistry. Three siloxane-oxirane monomers were synthesized and the products conversion was followed by Fourier-transform infrared spectroscopy. The products obtained were characterized by 1H and 13C NMR and evaluated for viscosity and refractive index. The polymerization was
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Ouardad, Samira. "Approches bio-inspirées du caoutchouc naturel par polymérisation cationique et modification chimique." Thesis, Bordeaux 1, 2011. http://www.theses.fr/2011BOR14465/document.

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Cette thèse a pour objectif de développer une nouvelle approche bio-inspirée des processus de polymérisation conduisant à la formation de polyterpènes et ultérieurement du caoutchouc naturel, un polyisoprène de structure purement 1,4-cis de forte masse molaire dont les propriétés sont encore inégalées par ses homologues synthétiques. Pour cette raison la production mondiale de caoutchouc naturel demeure stratégique et est toujours proche de 10 millions de tonnes, soit environ 45% de la demande mondiale annuelle en élastomères. Alors que les voies de synthèse développées jusqu’à présent pour ac
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Vidil, Thomas. "Contrôle du procédé d'élaboration et des propriétés d'un matériau époxy via la chimie supramoléculaire." Thesis, Paris 6, 2015. http://www.theses.fr/2015PA066142.

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Contrôler la gélification des résines époxy est un enjeu majeur de la chimie des matériaux thermodurcissables. Dans cette étude, nous décrivons une méthode de contrôle du temps de gel (tgel) et de la conversion au point de gel (xgel) dans le cas de la polymérisation cationique de résines époxy commerciales. Pour ce faire, des additifs hydroxylés sont utilisés comme agents de transfert afin de contrôler xgel. Parallèlement, des additifs de type oligo-oxyéthylène permettent de contrôler tgel en complexant les amorceurs de la polymérisation (cations aniliniums). La combinaison de ces deux leviers
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Persson, Per. "Strategies for cellulose fiber modification." Doctoral thesis, KTH, Fibre and Polymer Technology, 2004. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-3730.

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<p>This thesis describes strategies for and examples ofcellulose fiber modification.The ability of an engineered biocatalyst, acellulose-binding module fused to the<i>Candida antarctica</i>lipase B, to catalyze ring-openingpolymerization of e-caprolactone in close proximity tocellulose fiber surfaces was explored. The water content in thesystem was found to regulate the polymer molecular weight,whereas the temperature primarily influenced the reaction rate.The hydrophobicity of the cellulose sample increased as aresult of the presence of surface-deposited polyester.</p><p>A two-step enzymatic
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