Features of hydrolytic polycondensation of tetraethoxysilane

The processes taking place in the course of hydrolytic polycondensation of tetraethoxysilane (TES) at the molar ratio n = [H 2 O] 0:[TES] 0 = 0·2–1·5, were studied by means of the changes of the content of linear and cyclic ethoxysiloxanes. It was found that for each of the ethoxysiloxanes there exi...

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Bibliographic Details
Published in:Polymer science USSR 1985, Vol.27 (2), p.385-392
Main Authors: Kopylov, V.M, Voronkov, A.V, Zinovich, S.K, Tseitlin, G.M, Kireyev, V.V, Kostylev, I.M
Format: Article
Language:English
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Summary:The processes taking place in the course of hydrolytic polycondensation of tetraethoxysilane (TES) at the molar ratio n = [H 2 O] 0:[TES] 0 = 0·2–1·5, were studied by means of the changes of the content of linear and cyclic ethoxysiloxanes. It was found that for each of the ethoxysiloxanes there exists an optimum value of n at which it is formed in maximum yield. The obtained experimental data indicate that the composition and structure of the products of hydrolytic polycondensation depend on the degree of TEC hydrolysis in the initial reaction stages, and that this is determined by the value of n and the duration of the reaction. With increasing n, the time necessary for the reaction system to reach the stationary state increases. An increase of the concentration of the catalyst HCl has little effect on the composition of the polycondensation products, but it accelerates the transition to the stationary state.
ISSN:0032-3950
1878-268X
DOI:10.1016/0032-3950(85)90019-X