Influence of the nature of the R group on the hydrolysis and condensation process of trifunctional silicon alkoxides, R-Si(OR{prime}){sub 3}
- Univ. Pierre et Marie Curie, Paris (France). Chimie de la Matiere Condensee
The hydrolysis and condensation reactions of three trifunctional silicon alkoxides, R-Si(OEt){sub 3}, with various R alkyl chains (R = CH{sub 3}, C{sub 2}H{sub 5}, C{sub 8}H{sub 17}), was followed by {sup 29}Si and {sup 1}H 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.
- OSTI ID:
- 51587
- Report Number(s):
- CONF-940411--; ISBN 1-55899-246-4
- Country of Publication:
- United States
- Language:
- English
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