Accession Number:

ADA222643

Title:

Catalytic Synthesis of Polymethylsilsesquioxanes

Descriptive Note:

Technical rept.

Corporate Author:

WASHINGTON UNIV SEATTLE DEPT OF MATERIALS SCIENCE AND ENGINEERING

Report Date:

1990-05-31

Pagination or Media Count:

15.0

Abstract:

Dimethyltitanocene can be used to promote the redistribution of - MeHSiOx- cyclomers and linear oligomers to produce a polymethylsilsesquioxane copolymer. A mechanism for this redistribution is suggested, that involves sigma-bond metathesis promoted by a TitaniumIV species. The structural evolution of the polymethylsilsesquioxane copolymer as it is heated to 1000 deg C is followed using solid state 29 Silicon Nuclear Magnetic Resonance. Thermogravimetric Analysis experiments and chemical analysis support the NMR results which indicate that most of the starting monomer is either volatilized or undergoes further redistribution, so that by 400 deg C only polymethylsilsesquioxane remains. JG

Subject Categories:

  • Polymer Chemistry

Distribution Statement:

APPROVED FOR PUBLIC RELEASE