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Synthèse d'un Matériau Hybride Polyimide/Silice - Etude Structure-Proprietes

Benoit Didier 1
1 LMOPS - Matériaux organiques à propriétés spécifiques
LEPMI - Laboratoire d'Electrochimie et de Physico-chimie des Matériaux et des Interfaces
Abstract : This work consisted to synthesize a hybrid material polyimide/silica by Sol-Gel process. The preparation of these materials has a problem of compatibility between the phases organic and inorganic. Silica and polymer do not have particular affinity and tend to create strong phase segregation. To avoid this phenomenon several solutions were reported in the literature, like the use of coupling agent. In our case, we reduced this phenomenon by creating covalent bonds between polyimide and silica. For that, we fixed along the backbone of polyimide some functions alkoxysilanes which are reactive with silica, functions. These functions will react with silica during the Sol-Gel process. We varied various parameters such as the grafting rate between polymer and silica, or catalyst used at the time of the Sol-Gel process. The continuation of work consisted in studying the various morphologies obtained according to the evolution of the parameters of synthesis. For that, we used various techniques such as the thermogravimetric analysis, the determination of density, the infra-red spectroscopy, or microscopy. This work enabled us to determine the silica rates, the size of the particles within the matrix and their state of dispersion. We also studied the microstructure of our materials per dynamic mechanical spectroscopy. Indeed, different morphologies have various effects on the reinforcement of silica. We thus could identify phenomena of percolation for some of our materials. In a last time, we studied the properties of gas permeation of our materials, in order to draw the great evolutions from the coefficients of permeability and selectivity according to the silica rate and from the rate of grafting between the organic and inorganic phase. We thus showed that the introduction of silica and the grafting of this one with polymer conducted to materials less permeable, but generally more selective.
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Submitted on : Friday, August 26, 2005 - 9:09:09 PM
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Benoit Didier. Synthèse d'un Matériau Hybride Polyimide/Silice - Etude Structure-Proprietes. Matériaux. Université de Savoie, 2005. Français. ⟨tel-00009987⟩

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