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Dissertations / Theses on the topic 'Cationic polymerisation'

Author: Grafiati

Published: 4 June 2021

Last updated: 26 July 2025

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1

Tranter, Kenneth Shaun. "Remote cationic curing." Thesis, City University London, 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.340378.

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2

Sarker, Prodip Kumar. "Reactive polymers by ab initio cationic polymerisation." Thesis, University of Sheffield, 2003. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.400001.

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3

Forder, Clive. "Water-soluble block copolymers via living cationic polymerisation." Thesis, University of Sussex, 1996. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.318608.

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4

Yeates, Terence. "Synthesis and solution of polystyrene-block-polyisobutene copolymers." Thesis, University of Manchester, 1988. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.237269.

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5

Penfold, Nicholas. "Synthesis of cationic nanoparticles via polymerisation-induced self-assembly." Thesis, University of Sheffield, 2017. http://etheses.whiterose.ac.uk/18126/.

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6

Norström, Emelie. "Terpenes as renewable monomers for biobased materials." Thesis, KTH, Skolan för kemivetenskap (CHE), 2011. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-49875.

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With the ambition to decrease the utilization of fossil fuels, a development of those raw materials that today only are seen as waste products is necessary. One of those waste products is turpentine. Turpentine is the largest natural source of terpenes in the world today. The main components are the terpenes α-pinene, β-pinene and 3-carene. In this project, different polymerisation techniques have been evaluated to polymerise limonene with the aim to make a material out of the green raw material, turpentine. Limonene is a terpene that can be found in turpentine. It has a planar structure and

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7

Shorrock, Jennifer Kate. "Cationic polymerisation of alicene monomers by silica-supported aluminium chloride." Thesis, University of York, 2001. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.250624.

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8

Krishnamoorthy, Mahentha. "Developing cationic nanoparticles for gene delivery." Thesis, Queen Mary, University of London, 2016. http://qmro.qmul.ac.uk/xmlui/handle/123456789/23193.

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Gene delivery can potentially treat acquired and genetic diseases such as cystic fibrosis, haemophilia and cancer. Non-viral gene delivery vectors are attractive candidates over viral vectors such as recombinant viruses, due to their lower cytotoxicity and immunogenicity, despite significantly lower transfection efficiencies. To improve efficiency of non-viral vectors, the investigation of the various parameters influencing DNA transfection is essential. The present study developed a versatile gene delivery system with tailored physicochemical and biological properties. The system used polymer

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9

DesaÌ„iÌ„, Hemanta. "Studies of the cationic polymerisation of vinylic energetic cyclic ether monomers." Thesis, Aston University, 1995. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.294631.

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10

Lang, Weihong. "Synthesis of oligo (vinyl ether)s in ab initio cationic polymerisation." Thesis, University of Sheffield, 2002. http://etheses.whiterose.ac.uk/10205/.

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Terminally functionalised oligo(vinyl ether)s were produced in ab initio cationic polymerisations. Various polymerisations and chain end functionalisation systems were investigated. MALDI-TOF mass spectrometry was applied to analyse the obtained oligomers and thus the polymerisation and chain end functionalisation process. Oligo(isobutyl vinyl ether), also oligo(ethyl vinyl ether) and oligo(methyl vinyl ether) were synthesised in cationic polymerisation. Silyl enol ethers were added to the polymerisation as end-capping agents before initiations and they compete with monomer to cap the carbocat

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11

Lancaster, Simon John. "Synthesis, structure and catalytic activity of cationic zirconium and hafnium alkyl complexes." Thesis, University of East Anglia, 1995. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.297046.

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12

Sage, ValeÌrie. "Silica supported Lewis acids as catalysts for the cationic polymerisation of styrene." Thesis, University of York, 2003. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.273902.

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13

Desai, Hemant. "Studies of the cationic polymerisation of vinylic and energetic cyclic ether monomers." Thesis, Aston University, 1995. http://publications.aston.ac.uk/9763/.

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The cationic polymerisation of various monomers, including cyclic ethers bearing energetic nitrate ester (-ON02) groups, substituted styrenes and isobutylene has been investigated. The main reaction studied has been the ring-opening polymerisation of 3- (nitratomethyl)-3-methyl oxetane (NIMMO) using the alcohol/BF3.0Et2 binary initiator system. A series of di-, tri- and tetrafunctional telechelic polymers has been synthesised. In order to optimise the system, achieve controlled molecular weight polymers and understand the mechanism of polymerisation the effects of certain parameters on the mol

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14

Tredget, Cara Siobhan. "Polymerisation and reactivity studies of cationic group 3 complexes with neural face-capping ligands." Thesis, University of Oxford, 2007. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.442923.

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15

Bray, David. "Cationic ring opening polymerisation (CROP) of oxetane and its derivatives using oxonium derived initiators." Thesis, Aston University, 2009. http://publications.aston.ac.uk/15287/.

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Several cationic initiator systems were developed and used to polymerise oxetane with two oxonium ion initiator systems being investigated in depth. The first initiator system was generated by the elimination of a chloride group from a chloro methyl ethyl ether. Adding a carbonyl co-catalyst to a carbocationic centre generated the second initiator system. It was found that the anion used to stabilise the initiator was critical to the initial rate of polymerisation of oxetane with hexafluoroantimonate resulting in the fastest polymerisations. Both initiator systems could be used at varying mono

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16

Obaid, Rami. "Synthesis of functional stimulus responsive oligovinyl ethers and towards highly branched polymers using ab initio cationic polymerisation." Thesis, University of Sheffield, 2015. http://etheses.whiterose.ac.uk/11926/.

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Oligo(vinyl ethers) with functionalised end groups were produced through the alkylation of silyl enol ethers in ab initio cationic polymerisations. In order to obtain high degrees of chain end functionality a great deal of care was taken in choosing the monomer concentration, the reaction temperature, Lewis acids and the concentration of silyl enol ether. The experiment also required the use of highly nucleophilic species such as silyl ketene acetal, which react with carbocations at similar rates to vinyl ethers. Rapid elimination of the primary adduct produced the ester end-groups. MALDI-TOF

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17

Bouchekif, Hassen. "From uncontrolled to control and then 'quasiliving' Cationic ring-opening polymerisation (C.R.O.P.)of oxetane by activation chain-end (A.C.E.) mechanism." Thesis, Aston University, 2002. http://publications.aston.ac.uk/9656/.

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18

Grund, Silke. "Synthese anorganisch-organischer Polyfurfurylalkohol-Nanokomposite durch die Zwillingspolymerisation." Doctoral thesis, Universitätsbibliothek Chemnitz, 2011. http://nbn-resolving.de/urn:nbn:de:bsz:ch1-qucosa-63440.

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In der vorliegenden Arbeit wird die kationische Polymerisation neuer Furanmonomere beschrieben, die zu anorganisch-organischen Nanokompositen führt. Die kationische Polymerisation des Tetrafurfuryloxysilans steht dabei im Vordergrund. Ausgehend von den synthetisierten Kompositen wird die Herstellung von anorganischen Oxiden durch thermische Oxidation und von Kohlenstoffmaterialien durch thermische Behandlung in Schutzgasatmosphäre beschrieben. Die Charakterisierung der Komposite, Oxide und Kohlenstoffmaterialien erfolgt mittels Festkörper-NMR-Spektroskopie, Röntgenbeugung und Elektronenmikrosk

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19

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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20

Cushion, Michael Gregory. "New main group and rare earth complexes and their applications in the ring-opening polymerisation of cyclic esters." Thesis, University of Oxford, 2011. http://ora.ox.ac.uk/objects/uuid:b5041775-575f-46bb-9f52-dc3417e76cca.

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This Thesis describes the synthesis and characterisation of new Main Group and Rare Earth alkyl, amide, alkoxide and borohydride complexes and their use as catalysts for the ring-opening polymerisation (ROP) of ε-caprolactone and rac-lactide. <strong>Chapter 1</strong> introduces ROP from an industrial and academic perspective, as well as polymer characterisation techniques. A literature review is given, with an emphasis placed on Main Group catalysts. <strong>Chapter 2</strong> describes the synthesis and characterisation of new homo- and hetero-scorpionate Main Group complexes. An in

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21

Fauxpoint, Didier. "Polymeres en peigne mesomorphes a caractere electroactif obtenus par polymerisation cationique de mesogenes polaires." Clermont-Ferrand 2, 1988. http://www.theses.fr/1988CLF21071.

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Elaboration et etude de polymeres a chaine conjuguees possedant une structure en peigne:(rc=n)::(n). Les monomeres synthetises ont une architecture chimique analogue a celle des mesogenes thermotropes classiques. Le decouplage du groupe polymerisable(cn) par rapport au "coeur aromatique" de la molecule leur confere un caractere original. La synthese du polymere necessite la complexation du monomere avec un halogenure de metal de transition. Le caractere electroactif du polymere est etudie par dopage en phase cristalline

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22

De, Souza Roberto Fernando. "Etude des reactions d'oligomerisation, isomerisation et polymerisation de substrats insatures catalysees par des complexes allyle cationiques du nickel." Toulouse 3, 1987. http://www.theses.fr/1987TOU30152.

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Oligomerisation de l'ethylene. Mecanisme de l'isomerisation des olefines superieures en presence des complexes du titre. Polymerisation catalytique d'autres substrats insatures : styrene, dienes, alcynes. . . La polymerisation du phenylacetylene a ete etudiee en detail car elle conduit a des materiaux semiconducteurs a l'etat non dope

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23

Nadal, i. Soy Josep. "Noves aproximacions a la síntesi i caracterització de poliglicols al·lílics, polihidrosiloxans i surfactants copolimèrics. Avaluació d'aquests surfactants en formulacions de poliuretà." Doctoral thesis, Universitat de Girona, 2002. http://hdl.handle.net/10803/8030.

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Els polímers són una sèrie de compostos que troben un ampli ventall d'aplicacions en la indústria actual. Un exemple són les espumes de poliuretà, estructures de tipus cel·lular obtingudes mitjançant la reacció química entre compostos de tipus isocianat i compostos de tipus poliol (polièters amb diferent nombre de grups hidroxil). És imprescindible l'ús d'additius d'estructura tensioactiva (surfactants de silicona) per estabilitzar el procés d'espumació i per proporcionar una estructura cel·lular ordenada i homogènia en mida i distribució. La síntesis i caracterització de les molècules precurs

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24

NICOL, PASCAL. "Etude comparee des polymerisations cationiques des cyclosiloxanes par des amorceurs protoniques et non protoniques." Paris 6, 1987. http://www.theses.fr/1987PA066711.

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Polymerisation de l'hexamethylcyclosiloxane amorcee par des complexes d'association entre un acide de lewis et un chlorure d'acide, donnant les memes produits que la polymerisation amorcee par l'acide trifluorosulfonique. Formation dans les 2 cas d'un haut polymere par un mecanisme de propagation en chaine via un nombre constant de macromolecules lineaires. Discussion des mecanismes globaux possibles

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25

Gerard, Eric-Jack. "Synthese, caracterisation et comportement de polyurethannes hydrophiles : etude du mecanisme de la polycondensation reticulante." Université Louis Pasteur (Strasbourg) (1971-2008), 1988. http://www.theses.fr/1988STR13192.

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Synthese d'hygrogels, constitues de chaines elastiques de polydioxolanne. Les reticulats sont synthetises en milieu organique par couplages multiples des extremites hydroxylees, du polydioxolanne precurseur avec un compose isocyanate plurifonctionnel. Apres reaction, un echange progressif du solvant organique par l'eau permet d'obtenir les hydrogels

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26

Habimana, Jean de la Croix. "Fonctionnalisation directe en polymérisation cationique : synthèse d'oligoisobutène azido-téléchélique." Grenoble INPG, 1989. http://www.theses.fr/1989INPG0016.

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27

Berlot, Isabelle. "Synthèse, caractérisation et étude électrochimique de tensioactifs dérivés du pyrrole." Université Joseph Fourier (Grenoble), 1998. http://www.theses.fr/1998GRE10087.

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Ce memoire est consacre a la synthese, la caracterisation et l'etude electrochimique de nouveaux tensioactifs derives du pyrrole, analogues du dodecyltrimethylammonium et associes aux contre-ions br#-, no#-#3, tso#-, bf#-#4. La plupart forment des micelles en solution aqueuse. Une electrode selective du cation dodecyltrimethylammonium a ete utilisee pour determiner leurs concentrations micellaires critiques (cmc). Nous avons aussi montre que la voltammetrie cyclique permet dans certains cas de determiner la cmc en milieu electrolytique, en depit du caractere irreversible de l'oxydation de la s

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28

Tingry, Sophie. "Synthèse et application en hydrogénation électrocatalytique de films de polypyrrole fonctionnalisés par des complexes du rhodium et de l'iridium." Université Joseph Fourier (Grenoble ; 1971-2015), 1996. http://www.theses.fr/1996GRE10137.

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Ce memoire est consacre a la synthese d'electrodes modifiees (em) par des films de polypyrroles fonctionnalises par des complexes polypyridiniques de metaux de transition et a leur application en electrocatalyse en milieu aqueux. Une partie de ce travail de recherche a ete orientee vers l'amelioration de l'efficacite, de la stabilite et de la selectivite de films de polymeres derives des complexes rh(l)#2(cl)#2#+ (l=2,2'-bipyridine ou 1,10-phenanthroline substituees), vis-a-vis de l'hydrogenation electrocatalytique (hec) de substrats organiques insatures. En particulier, nous avons montre que

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29

Estienne, Jacques. "Des halogènes dans les édifices moléculaires étioniques : études cristallographiques, corrélations structure-réactivité, structure-conductivité, modèles structuraux." Aix-Marseille 1, 1986. http://www.theses.fr/1986AIX11001.

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Etude structurale de substances pouvant intervenir en tant que catalyseurs ou conducteurs electriques dans le monde industriel, dans le cadre de trois modeles : modele de l'atome cl mu -ponsteur co::(3) cl(c::(2)f::(3)o::(2))::(3)(so::(4))(c::(4)h::(10)o::(2))::(3) et mn::(4)cl::(4)(c::(2)f::(3)o::(2))::(4)(c::(4)h::(10)o)::(6), modele de l'ion tribromure dans des composes organiques et modele de l'iodure simple (iodures organiques comportant des dications diazoniatricycliques c::(14)h::(28)n::(2)**(2+). 2i**(-) et c::(15)h::(30)n::(2)**(2+). 2i**(-) et de l'ion iodoargentate (ag::(4) i::(8)**

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30

Robert, Dominique [Verfasser]. "Neutral and cationic complexes of the rare earth metals : synthesis, characterisation and polymerisation catalysis / vorgelegt von Dominique Robert." 2008. http://d-nb.info/992055644/34.

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31

Grund, Silke. "Synthese anorganisch-organischer Polyfurfurylalkohol-Nanokomposite durch die Zwillingspolymerisation: Synthese anorganisch-organischer Polyfurfurylalkohol-Nanokompositedurch die Zwillingspolymerisation." Doctoral thesis, 2010. https://monarch.qucosa.de/id/qucosa%3A19428.

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In der vorliegenden Arbeit wird die kationische Polymerisation neuer Furanmonomere beschrieben, die zu anorganisch-organischen Nanokompositen führt. Die kationische Polymerisation des Tetrafurfuryloxysilans steht dabei im Vordergrund. Ausgehend von den synthetisierten Kompositen wird die Herstellung von anorganischen Oxiden durch thermische Oxidation und von Kohlenstoffmaterialien durch thermische Behandlung in Schutzgasatmosphäre beschrieben. Die Charakterisierung der Komposite, Oxide und Kohlenstoffmaterialien erfolgt mittels Festkörper-NMR-Spektroskopie, Röntgenbeugung und Elektronenmikrosk

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