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Solvent-free synthesis of reactive inorganic precursors for preparation of organic/inorganic hybrid materials

By Hynek Benes, Jocelyne Galy, Jean-François Gérard, Josef Plestil and Ludovic Valette

Abstract

International audiencePrehydrolyzed-condensed precursors containing amino or glycido groups were prepared via sol gel process using various alkoxysilanes in the bulk, without addition of solvent in any step of their preparation. The influence of the experimental set-up, the functionality and ratio of alkoxysilanes, and type of catalyst, on the structure buildup was studied. In the case of amino precursors, the sol-gel process was carried out at weak basic conditions while in the case of glycido precursors the sol-gel process was catalyzed by acid or neutral pH. The sol-gel process was monitored by (29)Si NMR in solution and the structure of the prehydrolysed-condensed precursors was characterized by small-angle X-Ray scattering. The systems with high content of tetraethoxysilane led to the fast gel formation. In weak acid medium tetraethoxysilane formed larger, more condensed species as well as small structures (based on Q (1), Q (2) and Q (3) species) with silanol groups. Strong acidic conditions led to the fast formation of insoluble silica particles in liquid (sol) phase containing monomeric alkoxysilanes. The most suitable precursor formulations based on the alkoxysilanes with amino groups, as well as the most efficient set-up, were selected and used to prepare hybrid organic/inorganic networks based on an epoxy matrix. These networks were characterized using dynamic mechanical analysis

Topics: Silica, Nanomaterial, Hybrid, Epoxy, Alkoxysilane, Sol-gel, [CHIM.POLY]Chemical Sciences/Polymers, [CHIM.MATE]Chemical Sciences/Material chemistry
Publisher: 'Springer Science and Business Media LLC'
Year: 2011
DOI identifier: 10.1007/s10971-011-2534-4
OAI identifier: oai:HAL:hal-00648866v1
Provided by: HAL-UJM
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