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29Si Nmr Study of Hydrolyzed Teos-Rteos (R: Methyl, Ethyl, Phenyl) Systems

Published online by Cambridge University Press:  10 February 2011

J. Mendez-Vivar ,
A. Mendoza-Bandala ,
A. Gutierrez  and
G. Cao
J. Mendez-Vivar
Affiliation:
Universidad Autónoma Metropolitana-Iztapalapa, Depto. de Química. A. P. 55–534 México, D. F. 09340 México, jmv@xanum.uam.mx
A. Mendoza-Bandala
Affiliation:
Universidad Autónoma Metropolitana-Iztapalapa, Depto. de Química. A. P. 55–534 México, D. F. 09340 México, jmv@xanum.uam.mx
A. Gutierrez
Affiliation:
Universidad Autónoma Metropolitana-Iztapalapa, Depto. de Química. A. P. 55–534 México, D. F. 09340 México, jmv@xanum.uam.mx
G. Cao
Affiliation:
University of Washington; Materials Science & Engineering Department, 302 Roberts Box 352120 Seattle, Washington 98195-2120 USA, gzcao@u.washington.edu
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Abstract

Sols composed of Tetraethoxysilane (TEOS) and RTEOS (R: methyl, ethyl, phenyl) catalyzed with HCl were prepared. The molar ratios TEOS :RTEOS:EtOH:H20:HC1 were (1.0-0.8947):(5.26×10−2-0.1579):0.95:1.0:7×10−4, respectively. The sols were analyzed by 29 Si NMR immediately after mixing the reagents in order to study the hydrolysis and condensation reactions. A predominant self-condensation was observed in the TEOS-ETEOS sol, compared to cross-condensation. This result was opposite to the behaviour of the TEOS-MTEOS and TEOS-PTEOS sols.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 519: Symposium O – Organic/Inorganic Hybrid Materials , 1998 , 163
Copyright
Copyright © Materials Research Society 1998

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