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29Si NMR, Sec and Ftir Studies of The Hydrolysis and Condensation of Si(OC2H5 )4 and Si2O(OC2H5)6

Published online by Cambridge University Press:  28 February 2011

Chia-Cheng Lin  and
John D. Basil
Chia-Cheng Lin
Affiliation:
PPG Industries, Inc., Glass Research and Development Center, P.O. Box 11472, Pittsburgh, Pennsylvania 15238 U.S.A.
John D. Basil
Affiliation:
PPG Industries, Inc., Glass Research and Development Center, P.O. Box 11472, Pittsburgh, Pennsylvania 15238 U.S.A.
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Abstract

The hydrolysis and initial condensation reactions of Si(OC2H5)4 and low order polyethoxysiloxanes have been studied with high resolution 29Si NMR and size exclusion chromatography/FTIR spectroscopy. The effects of various parameters such as H2O/TEOS mole ratio, catalyst, pH, solvent, temperature and aging have been observed in the different nature of the reaction products. The products include partially hydrolyzed and unhydrolyzed Si(OC2H5)4, Si2O(CH2H5)6, and Si3O2(OC2H5)8. The rate of formation and concentration of each product obtained under different conditions provides information about the reactivity of various silanol-containing species and the factors that affect the overall reaction scheme.

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Articles
Information
MRS Online Proceedings Library (OPL) , Volume 73: Symposium H – Better Ceramics Through Chemistry II , 1986 , 585
Copyright
Copyright © Materials Research Society 1986

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References

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