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Thermal Stability of Silicon-Based Hybrid Materials Containing Aluminum Studied by 27Al and 29Si Solid State MAS NMR

Published online by Cambridge University Press:  10 February 2011

M. P. J. Peeters ,
A. P. M. Kentgens  and
I. J. M. Snijkers-Hendrickx
M. P. J. Peeters
Affiliation:
Philips Research Laboratories, Prof. Holstlaan 4, 5656 AA Eindhoven, The Netherlands
A. P. M. Kentgens
Affiliation:
SON HF-NMR Facility, University of Nijmegen, 6525 ED Nijmegen, The Netherlands
I. J. M. Snijkers-Hendrickx
Affiliation:
Philips Research Laboratories, Prof. Holstlaan 4, 5656 AA Eindhoven, The Netherlands
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Abstract

The addition of A(OBUs)2EAA to silicon-based materials containing PhTES or Glymo leads to a decrease in the thermal stability of the trifunctional siloxanes. 29Si MAS NMR shows that breaking of the Si-C bond and formation of an extra Si-O bond occurs after heating to 200°C of these materials. MeTES-containing materials are stable up to (at least) 200'C. The preparation of samples using Na[AlOR4] instead of Al(OBus)2EAA showed that the undesired decomposition reaction is caused by octahedral (non-network) aluminum (27Al MAS NMR). Up to 4–5 Si-C bonds are broken per octahedral aluminum, which indicates a catalytic effect.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 435: Symposium V – Better Ceramics Through Chemistry VII , 1996 , 415
Copyright
Copyright © Materials Research Society 1996

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