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Dissertations / Theses on the topic 'Conformation of polymers'

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Published: 4 June 2021

Last updated: 1 February 2022

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1

Qian, Hong. "Conformation and dynamics of main-chain liquid crystalline polymers." Thesis, Heriot-Watt University, 2004. http://hdl.handle.net/10399/245.

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2

Ma, Tianji. "Functionnalization of single nanopore by polymers : conformation, transport and applications." Thesis, Montpellier, 2019. http://www.theses.fr/2019MONTS072.

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Les canaux biologiques sont des protéines situées sur la membrane cellulaire. Ils permettent de maintenir l'équilibre des électrolytes et le transport des molécules. Ces canaux protéiques peuvent répondre à de multiples stimuli tels que la lumière, le pH, la force ionique et le potentiel transmembranaire afin de réguler leur perméabilité et leur sélectivité. Pour imiter ces pores biologiques, des nanopores artificiels ont été fabriqués des matériaux inorganiques ou polymères. Leurs avantages sont la simplicité de fabrication et leur stabilité mécanique et chimique. Cependant, ils sont générale

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3

Nam, Sunghyun. "Dynamics of Cyclic and Linear Poly(oxyethylene) and Threading Conformation in Their Blends." Diss., Georgia Institute of Technology, 2006. http://hdl.handle.net/1853/14135.

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Chemically identical but topologically different cyclic and linear polymers not only result in marked differences in dynamics, but also lead to unique transport properties of their blends, where cyclic polymers have chances to be threaded onto the linear polymers. This dissertation addresses the effect of ring architecture on dynamics using different time/length scale techniques: self-diffusion coefficients, NMR spin-spin relaxation time (T2) and bulk viscosity. In deuterated water, synthesized cyclic poly(oxyethylene) (CPOE) (400-1500 g/mol) diffused faster than corresponding linear POE (LP

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4

Royaud, Isabelle Anne-Marie. "Conformation and crystallinity in polymers - a study using novel Raman techniques." Thesis, University of Southampton, 1989. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.236347.

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5

Gagliardi, Simona. "Conformation and dynamics in cyclic and linear polymers by neutron scattering techniques." Thesis, Heriot-Watt University, 2002. http://hdl.handle.net/10399/378.

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6

Bouffard, Jean Ph D. Massachusetts Institute of Technology. "Molecular design of conjugated polymers for the control of conformation, electronics and self-assembly." Thesis, Massachusetts Institute of Technology, 2008. http://hdl.handle.net/1721.1/42915.

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Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Chemistry, 2008.<br>This electronic version was submitted by the student author. The certified thesis is available in the Institute Archives and Special Collections.<br>Vita.<br>Includes bibliographical references.<br>The design, synthesis and characterization of organic electronic materials, in particular luminescent conjugated polymers, with structural motifs that allow for the controlled modulation of their photophysical properties are presented. In Chapter 1, the synthesis of new heterocyclic oligo(phenylene) analogues based

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7

Cates, Ryan S. "Influence of Crosslink Density on Swelling and Conformation of Surface-Constrained Poly(N-Isopropylacrylamide) Hydrogels." Scholar Commons, 2010. https://scholarcommons.usf.edu/etd/1592.

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A stimuli-responsive microgel is a three-dimensional polymer network that is able to absorb and expel a solvent (commonly water). These materials are unique in the fact that their sponge-like behavior can be actuated by environmental cues, like temperature, ion concentration, pH, and light. Because of the dynamic properties of these materials they have found applications in drug-delivery systems, micro-assays, selective filtration, artificial muscle, and non-fouling surfaces. The most well-known stimuli-responsive polymer is Poly(N-isopropylacrylamide) or PNIPAAm and it experiences a switchabl

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8

Krause, Stefan, Pedro F. Aramendia, Daniela Täuber, and Borczyskowski Christian von. "Freezing single molecule dynamics on interfaces and in polymers." Universitätsbibliothek Chemnitz, 2013. http://nbn-resolving.de/urn:nbn:de:bsz:ch1-qucosa-122254.

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Heterogeneous line broadening and spectral diffusion of the fluorescence emission spectra of perylene diimide molecules have been investigated by means of time dependent single molecule spectroscopy. The influence of temperature and environment has been studied and reveals strong correlation to spectral diffusion processes. We followed the freezing of the molecular mobility of quasi free molecules on the surface upon temperature lowering and by embedding into a poly(methyl methacrylate) (PMMA) polymer. Thereby changes of optical transition energies as a result of both intramolecular changes of

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9

Bernard, Ayanna Malene. "Molecular modeling of poly(2-ethyl-2-oxazoline)." Diss., Atlanta, Ga. : Georgia Institute of Technology, 2008. http://hdl.handle.net/1853/24793.

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Thesis (Ph.D.)--Chemical Engineering, Georgia Institute of Technology, 2009.<br>Committee Chair: Peter Ludovice; Committee Member: Amyn Teja; Committee Member: Arthur Ragauskas; Committee Member: William Koros; Committee Member: Yulin Deng.

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10

Krause, Stefan, Pedro F. Aramendia, Daniela Täuber, and Borczyskowski Christian von. "Freezing single molecule dynamics on interfaces and in polymers." Physical Chemistry Chemical Physics. - 2011,13, S. 1754-1761, 2011. https://monarch.qucosa.de/id/qucosa%3A19944.

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Heterogeneous line broadening and spectral diffusion of the fluorescence emission spectra of perylene diimide molecules have been investigated by means of time dependent single molecule spectroscopy. The influence of temperature and environment has been studied and reveals strong correlation to spectral diffusion processes. We followed the freezing of the molecular mobility of quasi free molecules on the surface upon temperature lowering and by embedding into a poly(methyl methacrylate) (PMMA) polymer. Thereby changes of optical transition energies as a result of both intramolecular changes of

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11

Polińska, Patrycja. "Some thermodynamic, conformational and rheological properties of linear and hyperbranched polymer melts revisited." Thesis, Strasbourg, 2014. http://www.theses.fr/2014STRAE008/document.

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Ce travail était centré sur les propriétés thermodynamiques et mécaniques des polymères denses et sur leurs liens avec les systèmes de la matière molle et l'étude des propriétés de conformation et les propriétés rhéologiques des polymères hyperbranchés. L'étude de polymères hyperbranchés montre qu'ils sont substantiellement différents de leurs analogues linéaires. En utilisant des méthodes de simulation, nous pouvons obtenir des informations inaccessibles par des méthodes expérimentales et heureusement obtenir de précieuses informations du point de vue industriel et scientifique. Cette étude t

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12

Gutjahr, Petra. "Conformations of semiflexible polymers and filaments." Phd thesis, kostenfrei, 2007. http://opus.kobv.de/ubp/volltexte/2008/1591/.

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13

Silva, Idélcio Nogueira da. "Caracterização de agregados supramoleculares: interação de vesículas de Doda com polimetacrilato (OU) Caracterização de agregados supramoleculares: interação de vesículas de dioctadecildimetilamônio com polimetacrilato." Universidade de São Paulo, 2002. http://www.teses.usp.br/teses/disponiveis/46/46131/tde-05022016-091807/.

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Este trabalho teve como objetivo estudar a interação de polimetacrilato com vesículas de metacrilato de dioctadecildimetílamônio (DODAM) e brometo de dioctadecildimetilamônio (DODAB). A fotoirradiação de vesículas de DODAM a formou polimetacrilato na superfície vesicular do polímero, através da polimerização do contra-íon. Vesículas polimerizadas foram mais estáveis frenta á adição de metanol do que vesículas não polimerizadas. A estabilização da bicamada vesicular foi confirmada com o aumento da retenção da carboxifluoresceína (CF). Vesículas injetadas de DODAM retiveram cerca de 25% de CF, e

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14

Gouvion, Catherine. "Etude de la conformation des oligogalacturonides par résonance magnétique nucléaire et modélisation nucléaire." Grenoble 1, 1993. http://www.theses.fr/1993GRE10025.

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Une etude conformationnelle de quelques oligogalacturonides, de dp2 a 4, obtenus par hydrolyse enzymatique et chromatographie, a ete entreprise par resonance magnetique nucleaire et modelisation moleculaire. Les parametres rmn mesures en solution (constantes de couplage carbone-proton et effets overhauser nucleaires) peuvent etre convertis en parametres geometriques caracteristiques d'une conformation virtuelle moyenne. Par ailleurs des calculs s'appuyant sur le programme de chimie quantique pcilo ont ete effectues pour une serie de composes analogues. Les resultats de ces deux approches (expe

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15

Romeis, Dirk. "Conformational Transitions in Polymer Brushes." Doctoral thesis, Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2014. http://nbn-resolving.de/urn:nbn:de:bsz:14-qucosa-139354.

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A polymer brush is formed by densely grafting the chain ends of polymers onto a surface. This tethering of the long macromolecules has considerable influence on the surface properties, which can be additionally modified by changing the environmental conditions. In this context it is of special interest to understand and control the behavior of the grafted layer and to create surfaces that display a desired response to external stimulation. The present work studies densely grafted polymer brushes and the effects that such an environment imposes on an individual chain molecule in the grafted la

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16

Lapp, Alain. "Synthese, conformation et interactions de molecules lineaires et ramifiees de polydimethylsiloxane : mise en evidence de lois d'universalite." Université Louis Pasteur (Strasbourg) (1971-2008), 1987. http://www.theses.fr/1987STR13108.

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Synthese du polydimethylsiloxane etudie et etude de l'hydrosilation se produisant au cours de la reticulation en solution semidiluee, relation entre la longueur de correlation et la concentration. Interactions a trois corps dans le styrene, solvant theta du pdmsi

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17

Schulmann, Nava. "Du polymère à la fibre : Conformations et élasticité de chaines à deux dimensions." Thesis, Strasbourg, 2012. http://www.theses.fr/2012STRAE014/document.

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Cette thèse de doctorat est consacrée à l’étude analytique et numérique de systèmes de polymères et de fibres à deux dimensions. Des systèmes de polymères confinés en films ultra-minces présentent un très grand intérêt technologique et expérimentale et posent de nombreux défis théoriques en raison de leur fort comportement non-champ moyen qui se manifeste par divers exposants critiques non triviaux. Nous nous concentrons sur la limite strictement 2D où le croisement des chaînes est interdit et nous étudions, en fonction de la densité et de la rigidité des chaînes, les propriétés élastiques et

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18

Braggin, Greg A. "Effect of Surfactant Architecture on Conformational Transitions of Conjugated Polyelectrolytes." DigitalCommons@CalPoly, 2015. https://digitalcommons.calpoly.edu/theses/1411.

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Water soluble conjugated polyelectrolytes (CPEs), which fall under the category of conductive polymers, possess numerous advantages over other conductive materials for the fabrication of electronic devices. Namely, the processing of water soluble conjugated polyelectrolytes into thin film electronic devices is much less costly as compared to the processing of inorganic materials. Moreover, the handling of conjugated polyelectrolytes can be performed in a much more environmentally friendly manner than in the processing of other conjugated polymers because conjugated polyelectrolytes are water s

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19

Carroy, Antoine. "Conformation et dynamique des chaines de polyacrylamide a l'interface solide-liquide." Université Louis Pasteur (Strasbourg) (1971-2008), 1986. http://www.theses.fr/1986STR13043.

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Adsorption sur des aluminosilicates, cinetique et mecanisme desorption et echange entre molecules adsorbees et polymere en solution, mettent en evidence que le transfert de matiere entre la couche polymere de l'adsorbant et la solution de polymere est generalement un phenomene lent. La desorption ne se produit pas en absence de polymere en solution: l'interface presente alors un etat metastable

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20

Ecker, Christof. "Conformations of single polymer chains on surfaces." Doctoral thesis, Humboldt-Universität zu Berlin, Mathematisch-Naturwissenschaftliche Fakultät I, 2005. http://dx.doi.org/10.18452/15324.

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In dieser Arbeit wurden auf Substratoberflächen adsorbierte Polymermoleküle mit Rasterkraftmikroskopie (RKM) untersucht. Dabei war die Form der Moleküle (Konformation) von besonderem Interesse. Sie ist von zentralerer Bedeutung in der Polymerphysik und wird üblicherweise in Lösung und mit Streumethoden untersucht. Polymerkonformationen auf Oberflächen sind heutzutage noch wenig untersucht. Üblicherweise wird das Verhalten nach dem so genannten Wormlike-Chain Modell angenommen. Es basiert auf der Annahme, dass die Kettenbiegung nur aus thermischen Fluktuationen resultiert, so dass sich

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21

BARTHELEMY, BARGAIN FRANCOIS. "Proprietes electroniques et conformation de polymeres conjugues en solution." Paris 6, 1989. http://www.theses.fr/1989PA066028.

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Etude de la structure electronique et geometrique de polymeres coujugues, neutres et dopes, par diffusion aux petits angles et spectroscopie. Influence des substituants sur la conformation des polymeres. Modification de la rigidite des chaines due a l'apparition de charges mobiles par dopage, selon un mecanisme que les theories developpees pour les polyelectrolytes ne permettent pas de decrire

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22

Chen, Tong 1960. "Conformational-configurational characteristics of water-soluble acrylamide polymers." Thesis, Massachusetts Institute of Technology, 1991. http://hdl.handle.net/1721.1/13760.

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23

Dunlap, Paul N. "Studies of Flow Modification and Polymer Conformation in Extensional Flows of Dilute Polymer Solutions." Diss., Pasadena, Calif. : California Institute of Technology, 1986. http://resolver.caltech.edu/CaltechETD:etd-03212008-080541.

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24

DEMANGE, FOURMAUX VERONIQUE. "Polymere nematique en peigne sous deformation : synthese, rheologie et conformation." Paris 11, 1998. http://www.theses.fr/1998PA112191.

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Un polymere cristal-liquide en peigne associe les proprietes d'orientation a grande echelle des molecules cristal-liquide aux proprietes mecaniques des polymeres. Il pose donc un probleme fondamental : quelles sont les influences de la structure en peigne et de l'interaction nematique a longue portee sur la dynamique de la chaine ? pour repondre a cette question, nous avons compare les proprietes d'un polymere lineaire, d'un peigne non-nematique et d'un peigne nematique. Dans un premier temps, nous avons determine les temps de relaxation des chaines par rheologie classique. Dans un deuxieme te

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25

Ghanem, Antoine. "Analyse conformationnelle de polyesters thermotropes." Grenoble 2 : ANRT, 1987. http://catalogue.bnf.fr/ark:/12148/cb376053879.

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26

Arrighi, Valeria. "Chain conformation of a main-chain thermotropic liquid crystalline polymer." Thesis, Imperial College London, 1991. http://hdl.handle.net/10044/1/46651.

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27

Koo, Byungjin. "Conjugated polymers and designed interfaces : conformational analysis and applications." Thesis, Massachusetts Institute of Technology, 2017. http://hdl.handle.net/1721.1/111326.

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Thesis: Ph. D., Massachusetts Institute of Technology, Department of Materials Science and Engineering, 2017.<br>Cataloged from PDF version of thesis. Pages 160 and 161 are blank.<br>Includes bibliographical references.<br>The conformations of conjugated polymers can be altered by nearby environments. The intrapolymer conformation and interpolymer assemblies have a crucial impact on a variety of properties such as absorption, energy migration, and fluorescence. In this dissertation, the conformational changes and their effects on photophysics in different environments will be discussed. In Cha

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28

DEMANGE-FOURMAUX, Véronique. "Polymères Nématiques en peigne sous déformation: synthèse, rhéologie, conformation." Phd thesis, Université Paris Sud - Paris XI, 1998. http://tel.archives-ouvertes.fr/tel-00002896.

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Un polymère cristal-liquide en peigne associe les propriétés d?orientation à grande échelle des molécules cristal-liquide aux propriétés mécaniques des polymères. Il pose donc un problème fondamental : quelles sont les influences de la structure en peigne et de l?interaction nématique à longue portée sur la dynamique de la chaîne ? Pour répondre à cette question, nous avons comparé les propriétés d?un polymère linéaire, d?un peigne non - nématique et d?un peigne nématique. Dans un premier temps, nous avons déterminé les temps de relaxation des chaînes par rhéologie classique. Dans un deuxième

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29

Jangher, Abdulhakim Ali. "Temperature and cosolvent effects of polymer conformations in solution." Thesis, Cardiff University, 2011. http://orca.cf.ac.uk/55113/.

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Formulation is a complex science. Many functional molecules require formulation to enhance their aqueous solubility or to promote and protect their function. Understanding the interaction between the formulation components is a necessary first step in that process. This project focuses predominantly on quantifying the interactions (synergistic and antagonistic) that arise when a triblock copolymer Pluronic (PI23) is mixed with the anionic surfactant sodium dodecyl sulfate (SDS), in the presence of the cosolvent, ethanol. The interaction between PI23 and SDS is synergistic, and leads to the for

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30

Lee, Ting-wai. "Self-assembly and crystal structure analysis of some first-row transition metal coordination polymers of 1,3-bis(4-pyridyl)propane." Hong Kong : University of Hong Kong, 2001. http://sunzi.lib.hku.hk/hkuto/record.jsp?B23242322.

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31

Jusufi, Arben. "Conformations and interactions of star branched polymeric systems." [S.l.] : [s.n.], 2002. http://deposit.ddb.de/cgi-bin/dokserv?idn=965020576.

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32

Rawiso, Michel. "Etude structurale de macromolecules lineaires par diffusion de neutrons." Université Louis Pasteur (Strasbourg) (1971-2008), 1987. http://www.theses.fr/1987STR13209.

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33

Allen, Paul Richard. "The synthesis and study of polymers with repeating quaternary centres." Thesis, University of Bristol, 1995. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.294429.

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34

Haxaire, Katia. "Conformation du hyaluronane et interactions en solution et à l'état solide." Université Joseph Fourier (Grenoble ; 1971-2015), 2000. http://www.theses.fr/2000GRE10156.

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Cette etude fournit des informations conformationnelles permettant une meilleure comprehension de la conformation du hyaluronane (ha) en solution et a l'etat solide. Dans un premier temps, nous avons determine les conformations de basse energie des sous-unites disaccharidiques par modelisation moleculaire. A partir de ces resultats nous avons pu predire de nombreuses conformations helicoidales. La structure en double helice anti-parallele a egalement ete exploree. Nous avons egalement genere des chaines statistiques a partir des cartes d'energie des tetrasaccharides et determine des grandeurs

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35

Redeker, Neil. "MORPHOLOGY AND CONFORMATION OF POLYTHIOPHENE DERIVATIVES IN ANISOTROPIC CORE-SHELL NANOCOMPOSITES AND SOLUTION." DigitalCommons@CalPoly, 2013. https://digitalcommons.calpoly.edu/theses/1144.

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Conjugated semiconducting polymers have garnered substantial interest in recent years due to the potential for use in various applications, particularly in the field of electronic devices such as photovoltaic cells and light emitting diodes. Conjugated polymers offer numerous advantages in these applications, including low cost and high flexibility, but electronic devices based on these materials are currently limited by poor performance. Because of these limitations, increased focus has been placed on improving conjugated polymers for use in commercially viable products. Here, a novel core sh

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36

李鼎威 and Ting-wai Lee. "Self-assembly and crystal structure analysis of some first-row transition metal coordination polymers of 1,3-bis(4-pyridyl)propane." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2001. http://hub.hku.hk/bib/B31224660.

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37

VIDAUD, LIONEL. "Structure et conformation de cyclophosphazenes porteurs de polyamines en configurations naturelles ou exotiques." Toulouse 3, 1987. http://www.theses.fr/1987TOU30234.

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38

Brotherson, Brett Andrew. "Site blocking effects on adsorbed polyacrylamide conformation." Diss., Atlanta, Ga. : Georgia Institute of Technology, 2007. http://hdl.handle.net/1853/26509.

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Thesis (Ph.D)--Chemical Engineering, Georgia Institute of Technology, 2008.<br>Committee Chair: Yulin Deng; Committee Co-Chair: Peter Ludovice; Committee Member: James Frederick; Committee Member: Lawrence Bottomley; Committee Member: Preet Singh. Part of the SMARTech Electronic Thesis and Dissertation Collection.

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39

Ecker, Christof. "Conformations of single polymer chains on surfaces non-equilibrium, equilibrium and manipulation /." [S.l.] : [s.n.], 2004. http://deposit.ddb.de/cgi-bin/dokserv?idn=976610140.

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40

Narladkar, Ashok S. "Conformation, morphology and glass transition of poly(lactic acid) in supported thin films." Lorient, 2008. http://www.theses.fr/2008LORIS122.

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Les propriétés physiques des polymères, comme par exemple la température de transition vitreuse, se trouvent modifiés lorsque ces derniers sont confinés à proximité d’une paroi. D’un point de vue fondamental, de nombreuses questions restent ouvertes sur la nature exacte de ces variations et sur les paramètres qui les gouvernent. Par ailleurs, la détermination des changements de propriétés de certains polymères lors de confinement, tels que l’acide polylactique (PLA) de part son caractère biocompatible et biodégradable, est indispensable pour de nombreuses applications. Ce travail vise donc à é

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41

Desvergne, Sandra. "Polymacromonomères : Synthèse - Diffusion de Neutrons aux Petits Angles - RhéologieDe l'architecture ramifiée à la conformation : étoiles et cylindres chevelus au repos et sous écoulement." Bordeaux 1, 2005. http://www.theses.fr/2005BOR12998.

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Les polymacromonomers (PMs) sont des polymères ramifiés bien définis issus de la polymérisation de macromonomères. Les méthodes de synthèse utilisées ici (polymérisation anionique et polymérisation procédant par métathèse et ouverture de cycle) nous ont permis de travailler dans les conditions d'une polymérisation "vivante" et d'obtenir des PMs (branches de polystyrène (PS) et tronc de polynorbornène) possédant une distribution régulière et élevée de branches. La DNPA s'est avéré idéale pour décrire de façon quantitative la conformation des PMs, en offrant la possibilité de marquer nos polymèr

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42

Nasreddine, Victor Fuad. "Solid state nuclear magnetic resonance spectroscopy of polymer thin films : chain conformation, dynamics, and morphology." Thesis, McGill University, 2002. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=83081.

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This dissertation presents solid-state NMR studies of the chain conformation, dynamics and morphology of three adsorbed polymer systems: two random semi-crystalline copolymers, poly(ethylene-co-acrylic acid) (PEA) and poly(propylene-co-acrylic acid) (PPA), and an amorphous homopolymer, poly(n-butyl methacrylate) (PnBMA). Zirconia (ZrO2) was chosen as the substrate for all three polymers since the binding of carboxylic acids to this metal oxide is well understood. The choice of polymers was based on their particular bulk conformational and dynamic properties as well as their common use i

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43

Sisk, David Theodore. "I. Tunable Luminescence in Dendronized Poly(phenyleneethynylene)s Through Post-Polymerization Chemical Modification II. Rigid, Helical Polymers Based Upon Chiral Hydrobenzoin." Diss., The University of Arizona, 2007. http://hdl.handle.net/10150/194768.

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Dendritic encapsulation of poly(phenyleneethynylene)s or PPEs has been shown to enhance photoluminescent quantum efficiency and facilitate energy transfer by funneling photonic energy absorbed on the dendron periphery efficiently to the conjugated polymeric core. The research presented herein focuses on incorporating degradable dendron onto PPEs, examining whether or not similar benefits were conferred upon the proposed system and controlling polymer luminescence through the elimination of the insulating macromolecules. PPEs appended with disassembling dendrons of various generation sizes we

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44

Ube, Toru. "Orientation and Conformation of Single Polymer Chain Studied by Scanning Near-Field Optical Microscopy." 京都大学 (Kyoto University), 2011. http://hdl.handle.net/2433/142243.

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45

Nayak, Dhananjaya. "Conformational mechanisms in T7 RNA polymerase transcription a dissertation /." San Antonio : UTHSC, 2008. http://learningobjects.library.uthscsa.edu/cdm4/item_viewer.php?CISOROOT=/theses&CISOPTR=44&CISOBOX=1&REC=11.

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46

Mattoussi, Hedi Mohamed. "Contribution a l'etude de polymeres mesomorphes en solutions : etudes statique, dynamique et conformationnelle." Paris 6, 1987. http://www.theses.fr/1987PA066516.

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47

Le, Cam Eric. "Conformation de l'ADN et interactions ADN-protéines en microscopie électronique." Paris 11, 1995. http://www.theses.fr/1995PA11T007.

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48

Davis, Wyatt Julian. "Computational Modeling of Polymer Crowding: Influence of Solvent Quality and Dimensionality on Conformations." Thesis, North Dakota State University, 2018. https://hdl.handle.net/10365/28737.

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The structure and function of polymers in confined environments, e.g., biopolymers in the cytoplasm, are affected by macromolecular crowding. To explore the influence of solvent quality and dimensionality on conformations of crowded polymers, polymers are modeled as penetrable ellipsoids/ellipses, whose shapes are governed by the statistics of random walks. Within this coarse-grained model, Monte Carlo simulations of two and three-dimensional polymer-nanoparticle mixtures, including trial changes in polymer size and shape, are performed. Penetration of polymers by nanoparticles is incorporated

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49

Roure, Isabelle. "Rhéologie et dimensions des chaines du hyaluronane en solution." Université Joseph Fourier (Grenoble), 1997. http://www.theses.fr/1997GRE10227.

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Abstract:

Dans ce travail, nous avons cherche a relier le comportement rheologique des solutions de hyaluronane (ha) et de son derive reticule le hylane, aux dimensions des chaines. Dans une premiere partie nous avons etudie l'influence de la force ionique sur la viscosite des solutions et sur la separation en masse molaire par chromatographie d'exclusion sterique (sec). Nous montrons que la contribution du ha a la force ionique correspond a celle d'un electrolyte simple. L'obtention a de faibles forces ioniques d'un maximum dans la courbe viscosite reduite en fonction de la concentration en polymere a

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50

Veissier, Valérie. "Etude de la dynamique locale dans les polymeres en masse par declin d'anisotropie de fluorescence." Paris 6, 1987. http://www.theses.fr/1987PA066063.

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Abstract:

La fonction d'autocorrelation orientationnelle a ete ajutee au modele de diffusion et perte generalisee (gdl). La signification physique des temps de correlation relatifs aux modeles conformationels a ete precisee et l'influence de la structure du polymere sur ces parametres a ete demontree. Etude de l'interaction entre la sonde fluorescente et le polymere et etude theorique de son influence sur la dynamique de chaine

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