In our studies the influence of different dispersing agents on the synthesis and character of silica particles prepared by a sol-gel reaction was investigated. The silica with different surface morphology was synthesized from tetraethoxysilane (TEOS) in suspension medium - decane (an appropriate model for the elastomer). The character and structure of used dispersants strongly interacted on the shape, the particle size distrbution and morphology of silica. In comparision the reaction in the presence of dispersants was conducted "in-situ", directly, in elastomeric medium. For this purpose the mixtures of hydrogentated butadiene-acrylonitrile HNBR and ethylene-propylene rubbers containing different amount of tetraethoxysilane and dispersants were prepared. Before the vulcanization the rubber mixtures were swelled in atmosphere of carbon dioxide or were allowed to stand in atmosphere with high moisture to catalyze the sol-gel reaction. The rubber mixtures containing synthesized in decane nanoparticles of silica were also prepared.

The work was supported by State Committee for Scientific Research (3T09 B 08027)

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1. Elastomers containing fillers with magnetic properties