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Matériaux hybrides polymères-particules de silice: Synthèse et caractérisation

Abstract : Hybrid nanomaterials have a more and more important place in our daily life ; one can find their use in various domains as building, biomedical or beauty product. A large part of studies devoted to the synthesis of these materials are performed in organic solvents. In order to open the range of their applications and to respect the environmental concerns, we decided to study the synthesis of hybrid materials (silica/polymer) in an aqueous media and without free initiator. The purpose of our study was also to shed some light on the mechanism aspect of a polymerization reaction carried out from silica nanoparticles. First, we synthetised silica nanoparticles, grafted by Controlled Radical Polymerization initiators. This step was characterized by NMR and SANS, to determine the grafting rate of initiators on the particles surface and also the agregation ratio. Then, the polymerization of dimethylaminoethyl methacrylate was performed from the particle surfaces, without adding free initiator. Despite aggregation phenomena during the polymerization reaction, SANS analysis showed clearly that polymer grafted silica particles exhibit a polymer shell.
To our knowledge, this result represents the first example of polymer covalently grafted silica particles obtained in aqueous solution.
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Submitted on : Monday, December 1, 2008 - 2:32:05 PM
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Jérôme Vinas. Matériaux hybrides polymères-particules de silice: Synthèse et caractérisation. Chimie. Université de Provence - Aix-Marseille I, 2008. Français. ⟨tel-00343397⟩

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