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A TG/GC/MS Study of the Structural Transformation of Hybrid Gels Containing Si-H and Si-CH3 Groups into Oxycarbide Glasses

Published online by Cambridge University Press:  10 February 2011

G. D. Sorarù ,
R. Campostrini ,
G. D'andrea  and
S. Maurina
G. D. Sorarù
Affiliation:
Dipartimento di Ingegneria dei Materiali, 38050 Trento, Italy, soraru@ing.unitn.it
R. Campostrini
Affiliation:
Dipartimento di Ingegneria dei Materiali, 38050 Trento, Italy, soraru@ing.unitn.it
G. D'andrea
Affiliation:
Dipartimento di Ingegneria dei Materiali, 38050 Trento, Italy, soraru@ing.unitn.it
S. Maurina
Affiliation:
Dipartimento di Ingegneria dei Materiali, 38050 Trento, Italy, soraru@ing.unitn.it
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Abstract

The pyrolytic transformation of hybrid gels containing Si-CH3 and Si-H groups is studied with a novel TG/GC/MS technique. Pyrolysis of a gel precursor for SiOC system shows a main decomposition step with the evolution of many different silanes and siloxane species arising from redistribution of Si-H and Si-O bonds in the polymeric network. B-containing gel, precursor for SiBOC oxycarbide glasses, displays a dramatically different pyrolysis pathway in which the redistribution reactions are completely suppressed and the Si-H and Si-CH3 groups are partially consumed at low temperature (≈ 220°C) to form H2 and CH4.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 435: Symposium V – Better Ceramics Through Chemistry VII , 1996 , 381
Copyright
Copyright © Materials Research Society 1996

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