Tesis sobre el tema "Polystyrene"
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Simard, Yan. "Thermolysis of polystyrene". Thesis, McGill University, 1994. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=68051.
Texto completoCalifano, Rosa. "Functionalized Syndiotactic Polystyrene". Doctoral thesis, Universita degli studi di Salerno, 2012. http://hdl.handle.net/10556/306.
Texto completoLa sintesi di materiali polimerici da metodo di modificazione, per ottenere le proprietà desiderate in polimeri, è un argomento importante in chimica dei polimeri e tecnologia. Molto spesso, proprietà desiderate non sono raggiungibili dalle proprietà di un omopolimero singolo. Una strategia comunemente utilizzato per raggiungere questo scopo è l'ancoraggio di gruppi funzionali specifici lungo le catene polimeriche In questo contesto che l'interesse nella funzionalizzazione di polistirene sindiotattico (s-PS) sorge, uno semi-cristallina polimero termoplastico che dispone di basso costo e eccellenti proprietà meccaniche e dielettriche, eccellente resistenza al calore e resistenza ai solventi. Inoltre, il sPS ha un polimorfismo complessa e la peculiarità che due delle sue forme note cristalline sono nanoporoso che sono caratterizzate della presenza di spazi vuoti (cavità nel δ-form e canali in forma ε) all'interno del reticolo cristallino, in grado per accogliere piccole molecole. Questa tesi presenta nuova strategia selettiva funzionalizzazione per solo fase amorfa di s-PS che al tempo stesso non cambia la fase cristallina e pertanto tutte le caratteristiche del s-PS. La solfonazione permette di introdurre un gruppo polare acido sulle catene polimeriche della fase amorfa di s-PS, che rende il polimero idrofilo, con una capacità di scambio protonico, da qui l'idea di usare pellicole solfonati di sPS come membrane polyelectrolytic in carburante cellule. [a cura dell'autore]
X n.s.
PIEL, SYLVIE. "Relations structure-proprietes de copolymeres triblocs polystyrene bloc-polyisoprene bloc-polystyrene". Paris 6, 1993. http://www.theses.fr/1993PA066446.
Texto completoMailhot-Jensen, Bénédicte. "Etude des mécanismes de photooxydation du polystyrène, du polyacrylonitrile et du polystyrene-co-acrylonitrile". Clermont-Ferrand 2, 1993. http://www.theses.fr/1993CLF21502.
Texto completoDehonor, Gomez Mariamme. "Polystyrene grafting of CNx nanotubes for the elaboration of polystyrene-based nanocomposites". Lyon, INSA, 2007. http://theses.insa-lyon.fr/publication/2007ISAL0033/these.pdf.
Texto completoCette thèse concerne le développement de nouveaux matériaux à base de nanotubes de carbone dopés à l’azote (CNx) sur lesquels des chaînes de polystyrène (PS) ont été greffés in situ par polymérisation radicalaire contrôlée par des nitroxides. La méthode de polymérisation in situ se décompose en deux étapes principales : l’attachement radicalaire d’un système initiateur – contrôleur, suivi d’une polymérisation radicalaire type NMRP (Nitroxide Mediated Polymerization) en solution. Les nanotubes de carbone modifiés chimiquement sont ensuite utilisés pour l’élaboration de composites polymères – nanotubes. Le greffage de polymère est censé améliorer la dispersion des nanotubes dans la matrice ainsi que l’adhésion interfaciale nanotubes-matrice. Plusieurs types de matrices sont étudiées (PS amorphe, PEO semi-cristallin et mélanges PS-PEO). Une caractérisation approfondie a été menée sur les composites à renfort de nanotubes greffés, pour évaluer l’impact du greffage sur les propriétés mécaniques et électriques des composites
Dehonor, Gomez Mariamme Terrones Maldonado Mauricio Gauthier Catherine Gonzalez Montiel Alfonso. "Polystyrene grafting of CNx nanotubes for the elaboration of polystyrene-based nanocomposites". Villeurbanne : Doc'INSA, 2008. http://docinsa.insa-lyon.fr/these/pont.php?id=dehonor_gomez.
Texto completoVaradi, Jasline Deepthi Das. "Scratch Behavior of Polystyrene". University of Akron / OhioLINK, 2009. http://rave.ohiolink.edu/etdc/view?acc_num=akron1259183439.
Texto completoWingert, Maxwell. "Carbon dioxide foaming and High-pressure rheology of polystyrene and polystyrene/organoclay nanocomposites". The Ohio State University, 2007. http://rave.ohiolink.edu/etdc/view?acc_num=osu1167770881.
Texto completoDohnalová, Tea. "Skleněný pastýř". Master's thesis, Vysoké učení technické v Brně. Fakulta výtvarných umění, 2019. http://www.nusl.cz/ntk/nusl-396117.
Texto completoPukančíková, Andrea. "Praktické aspekty blokové polymerace styrenu". Master's thesis, Vysoké učení technické v Brně. Fakulta chemická, 2010. http://www.nusl.cz/ntk/nusl-216622.
Texto completoZhang, Huan. "Properties and Structures of Sulfonated Syndiotactic Polystyrene Aerogel and Syndiotactic Polystyrene/Silica Hybrid Aerogel". University of Akron / OhioLINK, 2014. http://rave.ohiolink.edu/etdc/view?acc_num=akron1405298489.
Texto completoYeniova, Canan Esma. "Impact Modified Polystyrene Based Nanocomposites". Master's thesis, METU, 2009. http://etd.lib.metu.edu.tr/upload/3/12610306/index.pdf.
Texto completo30B, 25A and 15A) were used as fillers. Nanocomposite preparation was performed in a co-rotating twin screw extruder. Initially elastomer and organoclay contents were kept at 5wt% and 1-2wt% respectively. Well dispersed silicate layers were obtained for the nanocomposite containing SEBS-g-MA and Cloisite®
25A owing to the high viscosity of SEBS-g-MA and the solubility of polystyrene end block of SEBS with PS matrix. Owing to higher hydrophobicity of Cloisite®
15A a better dispersion was expected compared to Cloisite®
25A, but, it was concluded that two long aliphatic tails of Cloisite®
15A limited the access of polymer chains to the clay surface. The desired impact strength values could not be achieved by using 5wt% elastomeric materials
therefore, it was decided to increase the SEBS-g-MA content up to 15, 20, 30 and 40wt%. With increasing elastomer content, increasing average elastomer domain size was obtained. Also, it was observed that with the addition of organoclay, the elastomeric domain size increases since the clay particles reside in the elastomer phase and at the interphase between elastomer and PS. The mechanical test results showed that the nanocomposites containing 15 and 20wt% SEBS-g-MA have the optimum average domain size that results in better impact strength values without deteriorating tensile properties.
Collis, M. W. "Microscale processing of polystyrene melts". Thesis, University of Cambridge, 2004. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.597878.
Texto completoLewis, D. "Enzyme adsorption to polystyrene latex". Thesis, University of Strathclyde, 1987. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.382347.
Texto completoTremlett, Clare J. "The surface modification of polystyrene". Thesis, Loughborough University, 2000. https://dspace.lboro.ac.uk/2134/10522.
Texto completoMerche, Delphine. "Synthèse et caractérisation de couches de polystyrène et de polystyrène sulfoné obtenues par polymérisation-plasma à pression (sub)-atmosphérique". Doctoral thesis, Universite Libre de Bruxelles, 2011. http://hdl.handle.net/2013/ULB-DIPOT:oai:dipot.ulb.ac.be:2013/209871.
Texto completoNos résultats ont montré que la DBD permettait d’obtenir des films de polystyrène de meilleure qualité (degré d’oxydation moindre…) qu’avec la torche commerciale en raison de l’atmosphère contrôlée de l’enceinte DBD. Les films sont déposés en présence d’un gaz porteur (Ar ou He dans la DBD). Nous avons pu mettre en évidence l’influence de la nature de ce gaz porteur sur la structure des films (degré de branchement, et de réticulation des films et de préservation des cycles aromatiques de la molécule de départ).
Les dépôts de polystyrène sulfoné ont été synthétisés dans la DBD en une seule étape, par « copolymérisation » de deux précurseurs (styrène et acide trifluorométhane sulfonique) injectés simultanément dans la décharge. Ces membranes pourraient servir d’électrolyte dans les piles à combustibles miniaturisées de type PEMFC (« Polymer Electrolyte Membrane Fuel Cell »), utilisant de l’hydrogène ou du méthanol et ce pour des applications portables.
L’acide trifluorométhane sulfonique permet le greffage de groupements sulfoniques échangeurs d’ions (nécessaires pour la conductivité de la membrane) sur le squelette de polystyrène.
La complémentarité des différentes techniques spectroscopiques utilisées -Spectroscopie des Photoélectrons X (XPS), Infra-Rouge à Transformée de Fourier (FTIR), Spectroscopie des Ions Secondaires (SIMS) statique et dynamique- ont montré que les groupements acides sulfoniques (bien préservés dans la décharge à pression sub-atmosphérique) étaient bien greffés dans la matrice de polystyrène, et ce sur toute l’épaisseur de la membrane. L’influence des paramètres (température de l’acide, tension appliquée entre les électrodes, nature du gaz porteur…) sur la quantité de groupements ionisables greffés, sur la vitesse de dépôt et aussi sur la morphologie des films a été étudiée respectivement par XPS et par microscopie.
En plus des dépôts sur substrats usuels (Si, acier…) utilisés pour les caractérisations chimiques, nous avons synthétisé les films directement sur des électrodes de carbone enrichies en platine.
Nous avons déposé le catalyseur à partir d’une solution colloïdale de platine nébulisée dans la post-décharge d’une torche plasma atmosphérique sur des couches de carbones poreuse et sur du carbone vitreux (utilisé comme modèle pour le profilage par SIMS dynamique) dans différentes configurations et ce pour différents paramètres afin de constituer des électrodes servant de substrat pour l’adhésion de la membrane-plasma pour des perspectives d’assemblage membrane-électrodes pour PAC. /
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Doctorat en Sciences
info:eu-repo/semantics/nonPublished
Dike, Ali Sinan. "Nanocomposites Based On Blends Of Polystyrene". Phd thesis, METU, 2011. http://etd.lib.metu.edu.tr/upload/12613296/index.pdf.
Texto completoand Cloisite
Demarquette, Nicole Raymonde. "Nonlinear viscoelastic properties of polystyrene solutions". Thesis, McGill University, 1990. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=60004.
Texto completoThe steady shear stress was found to be independent of shear rate at high shear rates. The Cox-Merz rule was found to be valid for concentrations less than 0.199 g.cm$ sp{-3}$, but a deviation from the rule was observed for higher concentrations. Sigmoidal damping functions, based on both the shear stress measurements and the birefringence measurements, were determined. The exponential stress coefficient and the third normal stress difference were calculated from experimental data for different values of exponential rate constant and different strain scale factor. The exponential rate constant was shown to have a strong influence on both the exponential stress coefficient and the third normal stress difference.
Pedley, Anne Margaret. "Solution properties of sulphonated polystyrene ionomers". Thesis, Imperial College London, 1990. http://hdl.handle.net/10044/1/46498.
Texto completoWatts, Paul CristoÌir Patrick. "Electrically conducting carbon nanotube polystyrene composites". Thesis, University of Sussex, 2003. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.288865.
Texto completoMoyses, Stephane. "Morphology and structure of syndiotactic polystyrene". Thesis, Sheffield Hallam University, 1997. http://shura.shu.ac.uk/20096/.
Texto completoAlekseeva, О. V., N. A. Bagrovskaya y A. V. Noskov. "Polystyrene Film Composites Filled with Fullerenes". Thesis, Sumy State University, 2013. http://essuir.sumdu.edu.ua/handle/123456789/35444.
Texto completoNdoro, Tinashe V. M. "Simulation of a Polystyrene Silica Nanocomposite". Phd thesis, TUPRINTS, 2011. https://tuprints.ulb.tu-darmstadt.de/2830/1/Ndoro_Tinashe_-_Thesis_2011.pdf.
Texto completoHuang, Chongwen. "Rheology of Oligomeric Sulfonated Polystyrene Ionomers". University of Akron / OhioLINK, 2016. http://rave.ohiolink.edu/etdc/view?acc_num=akron1471281020.
Texto completo侯斯健 y Sijian Hou. "Syntheses and functionalization of block copolymers based on polystyrene-block-poly(4-vinylpyridine) and polystyrene-block-polyisoprene". Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 1999. http://hub.hku.hk/bib/B31240331.
Texto completoHou, Sijian. "Syntheses and functionalization of block copolymers based on polystyrene-block-poly(4-vinylpyridine) and polystyrene-block-polyisoprene /". Hong Kong : University of Hong Kong, 1999. http://sunzi.lib.hku.hk/hkuto/record.jsp?B2168733X.
Texto completoAriza, Nathan Robert Ariza. "An Investigation on Compressive Mechanical Properties of Syndiotactic Polystyrene Gels and the Conductive Behavior of Syndiotactic Polystyrene Ionogels". University of Akron / OhioLINK, 2018. http://rave.ohiolink.edu/etdc/view?acc_num=akron1541783363046921.
Texto completoChan, Ngo-Hin. "Relaxation of polystyrene rubbed at low temperature /". View abstract or full-text, 2005. http://library.ust.hk/cgi/db/thesis.pl?PHYS%202005%20CHAN.
Texto completoOzden, Gulsum. "Synthesis And Characterization Of Polystyrene Clay Nanocomposites". Master's thesis, METU, 2004. http://etd.lib.metu.edu.tr/upload/12605132/index.pdf.
Texto completo#506
to 36.3 and 36.8 &
#506
respectively, indicating intercalation while the dspacing of the other prepared materials remained nearly unchanged compared to pure organoclay. At low clay content, (<
1 wt.%), in-situ formed nanocomposites showed the best improvement in mechanical properties including tensile, flexural, impact strength and Young&rsquo
s modulus. In all the three methods, the addition of organoclay increased the Young&rsquo
s modulus compared to neat resin, but the maximum improvement was 88.5 %, obtained at 0.73 wt. % organoclay in the in-situ formed material. In-situ polymerization method did not prove to be efficient at high clay loadings in terms of mechanical properties. At high clay loadings, the effects of the three methods on promoting mechanical properties were not significantly different from each other. The glass transition temperature increased from 105.5 oC in the pure polystyrene to 108.4 oC in the in-situ formed nanocomposite at 0.73 wt % organoclay due to the restricted mobility of the polymer chains within the organoclay layers.
St, Lawrence Sterling. "Crystallisation and mechanical properties of syndiotactic polystyrene". Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1998. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape11/PQDD_0003/NQ42570.pdf.
Texto completoRoth, Connie B. "Hole formation in freely-standing polystyrene films". Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1999. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape9/PQDD_0004/MQ43214.pdf.
Texto completoBrues, Michael J. (Michael Jason). "Thermolysis of mixtures of polyethylene and polystyrene". Thesis, McGill University, 1994. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=22642.
Texto completoDifferent reaction conditions were examined. It was determined that using a single reaction temperature (445$ sp circ$C) was as effective at separating the aromatic and aliphatic products as using two different reaction temperatures.
Polystyrene was found to catalyze the thermolysis of polyethylene. Conventional catalysts (Mordenite and FCC zeolite) affected the overall production and product distributions for mixtures and polyethylene, while only changing the product distribution for polystyrene. Hydrogen in the purge gas only slightly decreased the ratio of 1-alkenes to n-alkanes.
Recycled plastics yielded results similar to virgin polymers, although overall liquid production was decreased (probably due to the additives present in the plastics).
Khougaz, Karine. "Characterization of polystyrene based diblock copolymer micelles". Thesis, McGill University, 1995. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=40163.
Texto completoA method to evaluate the critical micelle concentrations (cmc's) of block copolymer micelles by SLS was developed to account for the effects of polydispersity on the cmc. It was found that for block copolymers which have a significant dependence of the cmc on the insoluble block length and which are polydisperse only the present approach was able to evaluate the cmc.
The micellization of PS-b-PANa and PS-b-poly(acrylic acid) (PS-b-PAA) block copolymers were investigated in organic solvents. The cmc's were found to range from $1 times10 sp{-7} { rm to} 5 times10 sp{-9}$ M for insoluble block lengths ranging from 2.6 to 18 units. The N$ rm sb{agg}$ and R$ rm sb{e}$ values for four PS-b-PANa series in tetrahydrofuran, were found to be a function of the length of both blocks. The effect of the degree of neutralization of the PAA block on micellization was probed by SLS and SAXS; micelle formation was found to commence at 5% neutralization. The distribution of water between toluene and the polar cores of block ionomer and sodium bis(2-ethylhexyl)sulfosuccinate (AOT) reverse micelles was investigated by proton chemical shift measurements as a function of temperature. The amount of water solubilized and the thermodynamic parameters of transfer were found to be a function of the core nature.
Lageraaen, Paul R. (Paul Robert). "Thermolysis of mixtures of polyethylene and polystyrene". Thesis, McGill University, 1993. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=56791.
Texto completoEvans, Angus Martin. "Structure, morphology and crystallisation of syndiotactic polystyrene". Thesis, Queen Mary, University of London, 1998. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.286595.
Texto completoBernardo, Carlos Gabriel Pires Morgado. "Solubility of organic liquids in polystyrene matrices". Thesis, University of Oxford, 2005. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.419261.
Texto completoRoss, Elaine. "Polystyrene-polyisoprene blends : a spin-label study". Thesis, University of Aberdeen, 1990. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.240342.
Texto completoLascelles, Stuart Francis. "Conducting polymer-coated micrometer-sized polystyrene latexes". Thesis, University of Sussex, 1997. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.362215.
Texto completoCallister, Stephen J. "The thermoreversible gelation of atactic polystyrene solutions". Thesis, University of Bristol, 1990. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.303740.
Texto completoCorrea, Carlos Alberto Flavio. "Structure-properties relationships in rubber toughened polystyrene". Thesis, Cranfield University, 1993. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.358206.
Texto completoReeve, Toby Benjamin. "Diol-functionalised polystyrene resins : synthesis and applications". Thesis, University of Leicester, 2004. http://hdl.handle.net/2381/30088.
Texto completoNoskov, А. V., О. V. Alekseeva, А. S. Kraev y А. V. Agafonov. "Dielectric Parameters of Polystyrene / Fullerene Composite Films". Thesis, Sumy State University, 2013. http://essuir.sumdu.edu.ua/handle/123456789/35431.
Texto completoGrewell, David A. "Laser Microwelding of Polystyrene and and Polycarbonate". The Ohio State University, 2002. http://rave.ohiolink.edu/etdc/view?acc_num=osu1396276070.
Texto completoTsagli, Kelvin Xorla. "Temperature Dependence of Photoluminescence Spectra in Polystyrene". University of Akron / OhioLINK, 2021. http://rave.ohiolink.edu/etdc/view?acc_num=akron1625744248503334.
Texto completoNg, Ting-Ting. "Surface modification of, and adhesion to, polystyrene". Thesis, Loughborough University, 2006. https://dspace.lboro.ac.uk/2134/34260.
Texto completoPerevosnik, Kathleen A. "Investigation of the Mechanical and Thermal Properties of Poly(styrene-block-isobutylene-styrene) (SIBS) and its Blends with Thymine-Functionalized Polystyrene". Akron, OH : University of Akron, 2008. http://rave.ohiolink.edu/etdc/view?acc%5Fnum=akron1226647131.
Texto completo"December, 2008." Title from electronic thesis title page (viewed 01/13/2010) Advisor, Judit E. Puskas; Faculty Reader, Gary R. Hamed; Department Chair, Ali Dhinojwala; Dean of the College, Stephen Z. D. Cheng; Dean of the Graduate School, George R. Newkome. Includes bibliographical references.
Eda, Goki. "Effects of solution rheology on electrospinning of polystyrene". Link to electronic thesis, 2006. http://www.wpi.edu/Pubs/ETD/Available/etd-042706-135317/.
Texto completoWong, Tsun Wah. "A study on mechanical properties of high density polyethylene/polystyrene/SBES [i.e. SEBS] polymer blends". access abstract and table of contents access full-text, 2001. http://libweb.cityu.edu.hk/cgi-bin/ezdb/dissert.pl?msc-ap-b21175202a.pdf.
Texto completo"A dissertation submitted in part-fulfilment of the requirements for the degree of Master of Science of City University of Hong Kong." Title from title screen (viewed on Sept. 4, 2006) Includes bibliographical references.
Loggi, Louis T. "An experimental characterization of the tensile behavior of polystyrene /". Online version of thesis, 1988. http://hdl.handle.net/1850/10217.
Texto completoLazzara, Thomas Dominic. "Self-assembled styrene based alternating copolymer nanotubes : modeling and experiment". Thesis, McGill University, 2008. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=112531.
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