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Structural Characterization of Gels Prepared from Co-Hydrolysis of Tetraethoxysilane and Dimethyldiethoxysilane.

Published online by Cambridge University Press:  25 February 2011

Florence Babonneau ,
Laurence Bois  and
Jacques Livage
Florence Babonneau
Affiliation:
Chimie de la Matière Condensée, Université P. et M. Curie, 4 place Jussieu, Paris, France.
Laurence Bois
Affiliation:
Chimie de la Matière Condensée, Université P. et M. Curie, 4 place Jussieu, Paris, France.
Jacques Livage
Affiliation:
Chimie de la Matière Condensée, Université P. et M. Curie, 4 place Jussieu, Paris, France.
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Abstract

This work is part of a more general study on the structural characterization of organically modified silica gels that are usually prepared from tetrafunctional, trifunctional and difunctional alkoxides. The systems that were investigated in this paper are gels prepared from co-hydrolysis of dimethyldiethoxysilane (DEDMS) and tetraethoxysilane (TEOS). The condensation process was followed by 29Si and 17O liquid NMR and shows clearly evidence for co-condensation reactions. Gels with various DEDMS/TEOS ratios were studied by 29Si and 1H MAS-NMR. The results are clearly correlated to the change in physical properties of the materials, from flexible polymeric gels at high DEDMS content to crosslinked brittle networks at low DEDMS content.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 271: Symposium N – Better Ceramics Through Chemistry V , 1992 , 237
Copyright
Copyright © Materials Research Society 1992

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References

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