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Preparations, Structures, and Properties of Polysiloxane-Silica Composites Prepared from a Variety of Hydrolyzable Precursors

Published online by Cambridge University Press:  10 February 2011

J. M. Breiner ,
J. E. Mark  and
G. Beaucage
J. M. Breiner
Affiliation:
Department of Chemistry
J. E. Mark
Affiliation:
Department of Chemistry
G. Beaucage
Affiliation:
Department of Materials Science and Engineering, The University of Cincinnati, Cincinnati, OH 45221
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Abstract

Poly(dimethylsiloxane) (PDMS) networks were prepared by tetrafunctionally endlinking hydroxyl-terminated chains with tetraethoxysilane (TEOS). The resulting networks were filled in-situ by hydrolysis-condensation reactions that were either acid or base catalyzed reactions on some novel precursors. These precursors included star-shaped molecules, rings, linear comb-like chains, and pre-hydrolyzed products of silanes such as TEOS. Both monomethoxy and trimethoxy groups were used as hydrolyzable groups on these molecules. The structures of the resulting composites were examined by small-angle X-ray scattering, and their mechanical properties were determined using equilibrium stress-strain measurements in elongation. Novel precursors with monomethoxy functionalities did not generate stable particulates, but those with trimethoxy functionalities did, with some improvements in mechanical properties. Partially-hydrolyzed TEOS provided the best reinforcement of these PDMS elastomers.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 520: Symposium P – Nanostructured Powders & Their Industrial Application , 1998 , 275
Copyright
Copyright © Materials Research Society 1998

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