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Influence of the nature of the R Group on the Hydrolysis and Condensation Process of Trifunctional Silicon Alkoxides, R-Si(OR')3

Published online by Cambridge University Press:  21 February 2011

Laurent Delattre  and
Florence Babonneau
Laurent Delattre
Affiliation:
Chimie de la Matière Condensée, Université Pierre et Marie Curie / CNRS, 4 place Jussieu, Paris, France
Florence Babonneau
Affiliation:
Chimie de la Matière Condensée, Université Pierre et Marie Curie / CNRS, 4 place Jussieu, Paris, France
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Abstract

The hydrolysis and condensation reactions of three trifunctional silicon alkoxides, R-Si(OEt)3, with various R alkyl chains (R = CH3, C2H5, C8H17), was followed by 29Si and 1H Nuclear Magnetic Resonance. The condensation reactions are faster for methyltriethoxysilane and the degree of condensation of the system is higher. The other two systems have similar behaviors during the first hours, with lowest degree of condensation. The condensation reactions slow down for the octyltriethoxysilane, due to the presence of the long alkyl chains which prevent condensation reactions between oligomeric species. The influence of the addition of tetraethoxysilane (TEOS) was studied: for all three systems, the degree of condensation of the network is higher, indicating the role of cross-linking played by TEOS.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 346: Symposium N – Better Ceramics Through Chemistry VI , 1994 , 365
Copyright
Copyright © Materials Research Society 1998

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References

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