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Nmr Characterization of the Chemical Homogeneity in Sol-Gel Derived Siloxane-Silica Materials

Published online by Cambridge University Press:  10 February 2011

Florence Babonneau ,
Virginie Gualandris  and
Monique Pauthe
Florence Babonneau
Affiliation:
Chimie de la Matière Condensée, Université Pierre et Marie Curie / CNRS, 4 place Jussieu, 75005 Paris, France.
Virginie Gualandris
Affiliation:
Chimie de la Matière Condensée, Université Pierre et Marie Curie / CNRS, 4 place Jussieu, 75005 Paris, France.
Monique Pauthe
Affiliation:
Chimie de la Matière Condensée, Université Pierre et Marie Curie / CNRS, 4 place Jussieu, 75005 Paris, France.
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Abstract

17O NMR in solution using enriched water as reactant has been used to investigate cohydrolysis of dimethyldiethoxysilane and tetraethoxysilane, as well as methyltriethoxysilane and tetraethoxysilane. Co-condensation reactions were clearly identified in both systems : the amount of oxo bridges between the two kinds of Si units is rather large, and those bridges are stable during aging, which favor a good chemical homogeneity in the final gels. This last point was investigated on the related dried gels by 29Si Magic Angle Spinning NMR, using Cross-Polarization (CP) technique that allows to probe the local environment of the various Si sites through 29Si-1H dipolar interactions.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 435: Symposium V – Better Ceramics Through Chemistry VII , 1996 , 119
Copyright
Copyright © Materials Research Society 1996

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