Littérature scientifique sur le sujet « Alliages de polymères – Synthèse (chimie) »
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Thèses sur le sujet "Alliages de polymères – Synthèse (chimie)"
Dubois, Charlotte. « Développement de mélanges de polymères avec la synthèse in situ d’une phase polyimide par extrusion réactive ». Electronic Thesis or Diss., Lyon, 2022. http://www.theses.fr/2022LYSE1149.
Texte intégralThe objective of this research work was the elaboration of polymeric blends from the in situ synthesis of a polyimide dispersed phase in several polymer matrices by reactive extrusion. Commercial dianhydride and diamine monomers were dispersed in molten polypropylene, polyamides and ethylene-propylene-diene monomer rubber in a twin-screw extruder. A kinetic study showed that the imidization reaction of the chosen polyimide system is very fast at elevated temperatures (< 30s) and is compatible with extrusion and the short residence times. The dispersion of polyimide nodules in the polymer matrices was very fine for all blends, with nodules diameters between 80 and 250 nm. This dispersion was stabilized with the creation of copolymers at the interface, which was evidenced by 13C NMR studies in the case of polyamide/polyimide blends. Reactive extrusion allows the unique combination of in situ synthesis and in situ compatibilization and was proven more efficient for the control of the structure and morphology than simple melt blending. Mechanical, thermal and rheological properties of the blends were deeply studied, in order to understand the reinforcement brought by the polyimide dispersed phase. Studies of the materials crystallinity were also performed, to explain the macroscopic modifications and establish structure-property relationships
Okhay, Nidhal. « Synthèse de réseaux polymères thermoréversibles par réaction de Diels-Alder ». Phd thesis, Université Jean Monnet - Saint-Etienne, 2012. http://tel.archives-ouvertes.fr/tel-00951977.
Texte intégralAdjidjonou, Kossi. « Synthèse et caractérisation de polymères supports chiraux : application à la réduction asymétrique ». Lille 1, 1990. http://www.theses.fr/1990LIL10110.
Texte intégralAdhami, Wissal. « Synthèse verte de polymères dans un système en flux ». Thesis, Lille 1, 2020. http://www.theses.fr/2020LIL1R037.
Texte intégralGreen chemistry is an attractive field which has evolved over the past twenty years and aims to develop products that do not harm the environment using eco-responsible syntheses. This work focuses on the green synthesis of polyesters which are considered as important synthetic polymers due to their biocompatibility and biodegradability. Polyesters are obtained by two main routes: polymerization by polycondensation of diacids with diols which is the most widely used route, and polymerization by ring opening of lactones, lactides or cyclic carbonate (Ring Opening Polymerization, ROP). Polycondensation requires harsh reaction conditions to promote the condensation reaction by removing a water molecule between the acid and alcohol functional groups in order to achieve high conversions. Recently, flow synthesis techniques have allowed better control of organic synthesis and polymerization reactions. We have studied the enzymatic ring-opening polymerization (e-ROP) of lactones using Novozym® 435 lipase as a catalyst immobilized on porous flow beads to develop controlled polymerization that respects the principles of green chemistry. The porous beads were introduced into a tubular reactor made of fluorinated ethylene propylene (FEP) with an internal diameter = 1.55 mm. We were able to polymerize ε-caprolactone (ε-CL) with a 100 % conversion rate (conv) and a dispersity (Đ) of 1.3 and δ-valerolactone (δ-VL) (conv = 93%, Đ = 1.27 respectively). Copolymers have also been synthesized. We have also studied the catalysis of ring-opening polymerization by phosphazenes which are organic superbases. The basicity of phosphazene governs the reaction: the highest basicity lead to the highest yield in spite of poorer dispersity. The best yields were obtained using P4-t-Bu (pK = 41.9) as catalyst for polymerizing ε-CL and δ-VL at room temperature, with values of 96% and 93% respectively. When P2-t-Bu (pK = 33.5) was used, a lower conversion of 45% was obtained but with a very good dispersity Đ = 1.08. We also worked on polycondensation using new organic catalysts with hydrophobic parts in their structures allowing the elimination of water or alcohol co-products which limit the course of the reaction. Thus we have studied the polycondensation between diols and diacids or diesters catalyzed by diphenylammonium triflate (DPAT) or pentafluorophenylammonium triflate (PFPAT) in batch. We obtained oligomers by polyesterification between succinic acid and butanediol using DPAT or PFPAT as catalysts with conversions of 76% and 67% respectively. Finally, we investigated photo-induced atomic transfer radical polymerization (ATRP) in a flow system using Eosin Y, an inexpensive organic compound that absorbs in the green (530 nm) to catalyze the polymerization of methyl methacrylate (MMA) which can be synthesized with a 91% conversion rate and a dispersity Đ of 1.42. The lively appearance of these polymers has been demonstrated by the success of subsequent copolymerizations. In conclusion, we have shown that flow chemistry allows polymer synthesis with better control of polymerization compared to flask synthesis. This better control makes it possible to obtain polymers with high yield, low dispersity and a molar mass close to the theoretical value
Lebreton, Arnaud. « Synthèse de polymères en étoile par amorçage pluricarbanionique ». Phd thesis, Université Sciences et Technologies - Bordeaux I, 2002. http://tel.archives-ouvertes.fr/tel-00009394.
Texte intégralChicart, Philippe. « Oligomères et polymères organosiliciés : synthèse et caractérisation de silacyclophanes et de polysilarylènes ». Montpellier 2, 1989. http://www.theses.fr/1989MON20238.
Texte intégralGalindo, Christophe. « Etudes des mécanismes radicalaires de greffage lors de la synthèse de polystyrène choc ». Aix-Marseille 1, 2004. http://www.theses.fr/2004AIX11045.
Texte intégralParein, Thibault. « Synthèse de nanocharges thermoélectriques, mise en œuvre et caractérisation de nanocomposites thermoélectriques ». Caen, 2015. http://www.theses.fr/2015CAEN2005.
Texte intégralThe aim of this work is to elaborate polymer/thermoelectric fillers composites, in order to help solving the weight, scarcity of the precursors and cost problems of thermoelectric massive materials. Firstly, polymer/bismuth telluride composites have been processed by a micro-extrusion and injection molding process, from micrometric particles. The possibility of obtaining conductive composites by this process has been demonstrated, nevertheless the percolation thresholds of the composites remain high. Secondly, in order to solve this problem, composites have been elaborated from immiscible co-continuous polymer blends. A significant reduction of the percolation threshold has been obtained, due to the selective localization of the fillers into one of the polymer phases. Finally, the elaboration of nanocomposites has also been investigated in order to lower the percolation threshold of the composites. A simple and low-cost synthesis procedure for thermoelectric bismuth telluride nanoparticles has been developed and polymer/bismuth telluride nanocomposites have been processed by micro-extrusion. The characterization of the elaborated nanocomposites has shown a dramatic decrease of the percolation threshold, allowing the limitation of the amount of particles used to get conductive composites, as their overall weight
Gagnon-Thibault, Évelyne. « Synthèse et caractérisation de matériaux polymères poreux pour le stockage d'hydrogène ». Thesis, Université Laval, 2012. http://www.theses.ulaval.ca/2012/29167/29167.pdf.
Texte intégralGingras, Émilie. « Synthèse et caractérisation de polymères ioniques à base de 2,7-carbazole ». Thesis, Université Laval, 2010. http://www.theses.ulaval.ca/2010/27554/27554.pdf.
Texte intégralLivres sur le sujet "Alliages de polymères – Synthèse (chimie)"
Nicola, Hüsing, dir. Synthesis of inorganic materials. Weinheim : Wiley-VCH, 2000.
Trouver le texte intégralAguado, Jose, Clark James H, David P. Serrano, M. J. Braithwaite et R. S. Drago. Feedstock Recycling of Plastic Wastes. Royal Society of Chemistry, The, 2007.
Trouver le texte intégralFeedstock Recycling of Plastic Wastes (Royal Society of Chemistry Clean Technology Monographs). Royal Society of Chemistry, 1999.
Trouver le texte intégralChapitres de livres sur le sujet "Alliages de polymères – Synthèse (chimie)"
Fontanille, Michel, et Yves Gnanou. « 10. Synthèse macromoléculaire ». Dans Chimie et physico-chimie des polymères, 335–58. Dunod, 2014. http://dx.doi.org/10.3917/dunod.fonta.2014.01.0335.
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