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Artykuły w czasopismach na temat "Chimie de réticulation"
Meyer, Olivier, Michel Delmotte, Jean-Christophe Lacroix i Arlette Fourrier-Lamer. "Chimie de synthèse : paramètres diélectriques de systèmes isolés et de mélanges réactionnels. I : réticulation d'une résine en présence d'un durcisseur". Annales de Chimie Science des Matériaux 29, nr 4 (31.07.2004): 73–88. http://dx.doi.org/10.3166/acsm.29.4.73-88.
Pełny tekst źródłaRozprawy doktorskie na temat "Chimie de réticulation"
Pire, Myriam. "Caoutchouc naturel époxydé et réticulation par les acides dicarboxyliques : chimie, cinétique et propriétés mécaniques". Phd thesis, Université Pierre et Marie Curie - Paris VI, 2011. http://pastel.archives-ouvertes.fr/pastel-00732940.
Pełny tekst źródłaFleury, Guillaume. "Des polyrotaxanes de haute masse moléculaire au réseau topologique : Les gels à points de réticulation glissants". Université Louis Pasteur (Strasbourg) (1971-2008), 2005. https://publication-theses.unistra.fr/public/theses_doctorat/2005/FLEURY_Guillaume_2005.pdf.
Pełny tekst źródłaA new class of supramolecular networks, where the crosslink points are not fixed but sliding, has been recently proposed and developed by Okumura and Ito. Their structure is based on intermoleculary crosslinked α-cyclodextrins / poly(ethylene-glycol) precursor polyrotaxanes. The intermolecular crosslinking between the polyrotaxane precursors leads to the formation of a supramolecular sliding network, the sliding gel. These specific networks are synthesized in two main steps: i) the formation of polyrotaxane precursors where the macrocycles are threaded along a template polymer chain; ii) the intermolecular crosslinking of some macrocycles. The sliding gels are expected to have very unusual physical / mechanical properties due to the theoretical ability of the crosslink points to slide along the polymer chain. The aim of this PhD work is to have more insight into the original properties of the sliding gels. For this purpose a controlled synthesis of the topological networks have been carried out and leads to a control of the complexation degree of the polyrotaxanes and of the crosslinking density of the topological network. The characterization of the sliding gels was carried out In order to explain the structure / properties relationships and to highlight on the sliding motion of the crosslink points. In particular the viscoelastic behaviour of the sliding gels in DMSO at low frequencies has revealed all the potential of the sliding crosslink points and underlines the high ability to relax with very low viscous dissipation of this material
Neamtu, Ropot Mioara. "Synthèse d'oligosiloxanes fonctionnalisés. Etude de leur photoréactivité". Montpellier 2, 1997. http://www.theses.fr/1997MON20191.
Pełny tekst źródłaGuérin, William. "Mécanismes de réticulation d’élastomères polysulfure par le dioxyde de manganèse : étude infrarouge et suivi rhéologique". Caen, 2016. http://www.theses.fr/2016CAEN2044.
Pełny tekst źródłaPolysulfide elastomeric materials are widely used in many fields (insulated glass, construction, automotive or aircraft industry) thanks to their outstanding properties, such as a remarkable chemical inertness. These polymers are obtained from liquid polysulfides, which are highly reactive oligomers. Exposed to an oxidizing agent, such as manganese dioxide (MnO2), the crosslinking of liquid polysulfides occurs through a redox reaction. However, the crosslinking reaction mechanism is still in debate. In this work, crosslinking of liquid polysulfide has been monitored in real time by infrared spectroscopy and rheology. Infrared spectroscopy has enabled a better understanding of the mechanism through the evolution of characteristic infrared bands of the reactive blends. Rheology links the chemical monitoring to the evolution of the viscoelastic properties of these materials. We demonstrate that the chemical equation usually admitted in the literature to describe the crosslinking of liquid polysulfides is an over-simplification. New species have been observed, whose formation was never described previously in polysulfide elastomeric materials. Moreover, an identification of the properties of the manganese dioxide which influence its reactivity has been done, improving the control of the crosslinking of these elastomers
Schapman, Fanny. "Fonctionnalisation et étude de la réticulation d'un polybutadiène hydroxy téléchélique". Rouen, 1996. http://www.theses.fr/1996ROUES035.
Pełny tekst źródłaImbernon, Lucie. "Réticulation non-permanente, chimique ou physique, du caoutchouc naturel époxydé : propriétés dynamiques et recyclage". Thesis, Paris 6, 2015. http://www.theses.fr/2015PA066427/document.
Pełny tekst źródłaImproving rubber recyclability is a major challenge of today’s society. These materials are usually crosslinked through permanent covalent chemistry, which prevents any further modification of the network structure. The aim of this thesis was to design the recyclability up-stream by using non-permanent chemistry for rubber crosslinking. Epoxidized natural rubber (ENR), chosen as the base rubber, is efficiently crosslinked by reaction of dicarboxylic acids on oxirane rings to form ester bonds. On the one hand, the addition of a transesterification catalyst let foresee the obtaining of vitrimer properties. The advantages of this exchangeable chemistry are shown by comparison to lightly permanently crosslinked rubbers that also show stress relaxation and adhesion properties. On the other hand, using a functionalized diacid with a central disulphide function, a certain degree of reprocessability could be obtained, comparable to what was obtained by conventional sulphur vulcanization. A major advantage of the presented diacid chemistry over vulcanization is the non-toxicity towards the environment. Lastly, by grafting long crystallizable fatty acids onto ENR, we synthesized thermoplastic elastomers. Like diacid-crosslinked ENR (chemical network), these physical networks show strain-induced crystallization measured by X-ray diffraction during cyclic tensile tests
Santarella, Jean-Michel. "Polymérisation cationique du pentadiène-1,3 par le chlorure ferrique, en milieu hexane". Grenoble INPG, 1994. http://www.theses.fr/1994INPG0175.
Pełny tekst źródłaVo, Huu Thao. "Analyse structurale des lignines extraites en milieu acide organique et fonctionnalisation". Montpellier 2, 2005. http://www.theses.fr/2005MON20064.
Pełny tekst źródłaLegris, Claude. "Étude de la formation de gels par réticulation radiochimique de la polyvinylpyrrolidone en solution". Compiègne, 1987. http://www.theses.fr/1987COMPE070.
Pełny tekst źródłaHydrophilic gels are finding increasing uses in a variety of industrial applications. The gamma radiolysis of solutions of polyvinylpyrrolidone was investigated. This polymer is broadly known for its applications as biomaterials and pharmaceutical products. We show that radiation method is specially attractive for creating such gels because the process is easily controlled and no additives are needed. We studied with special attention the following parameters : dose rate, concentration and molecular weight of polymer, nature of the solvent. The increase of the viscosity of the solutions was determined during the pre-gel stage. The respective values of sol and gel fraction were measured for the post-gel stage. The minimum radiative dose for formation of an incipient network (gelation dose) increases with the concentration of the initial polymer for aqueous solutions but decreases for methanolic solutions. But the efficiency of crosslinking, represented by a radiation chemical yield, increases steadily with this concentration in both cases. So we consider the various competing processes which account for the observed relationships. Swelling properties of the gels obtained under different conditions are reported
Gaudière, Fabien. "Développement de revêtements bioactifs pour les biomatériaux : modulation des comportements cellulaires en fonction du microenvironnement physico-chimique et mécanique". Rouen, 2013. http://www.theses.fr/2013ROUES047.
Pełny tekst źródłaThis work is in the context of the surface functionalization by the “Layer-by-Layer” (LbL) method. More specifically, it focuses on the surface optimization of orthopedic and dental biomaterials by proposing biomimetic coatings to control the cellular microenvironment, to promote osseointegration. Our choice fell on biomimetic LbL films comprised of chondroïtine sulfate A (CSA) and poly(L-lysine). Our works are structured around three axes. Initially, we describe the influence of the rigidity of models elastomeric substrates composed of PDMS and the surface chemistry, controlled by LbL films, on the short-, mid- and long-term behaviour of murine preosteoblasts like cells MC3T3-E1. After studying mechanical properties of the underlying substrate and characterizing the LbL films physicochemical properties, using complementary techniques (epifluorescence microscopy, FTIR-ATR, AFM, QCM-D), we note a combined influence of these parameters on the major cellular process (adhesion, proliferation and differenciation). Thereafter, we studied the crosslinking of these films by genipin, a natural crosslinker. After studying crosslinking mechanism and its influence on physicochemical and mechanical properties of our LbL films, we highlight their osteoconductive properties, genipin having favorably structured the LbL architectures. Finally, we explore the incorporation of a β cyclodextrin polymer within the LbL architecture, to achieve bioactive compounds vectorization and release toward cells