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Tear Strengths of Poly(Dimethylsiloxane) Networks Reinforced with in-Situ Precipitated Silica

Published online by Cambridge University Press:  10 February 2011

Chandima Kumudinie  and
James E. Mark
Chandima Kumudinie
Affiliation:
Department of Chemistry and the Polymer Research Center, University of Cincinnati, Cincinnati, OH 45221–0172
James E. Mark
Affiliation:
Department of Chemistry and the Polymer Research Center, University of Cincinnati, Cincinnati, OH 45221–0172
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Abstract

The tear strengths of in-situ filled poly(dimethylsiloxane) (PDMS) networks were investigated using “trouser-tear” tests. The filled PDMS networks were prepared by the simultaneous curing and in-situ precipitation technique, the silica reinforcing phase being obtained by the hydrolysis and condensation of tetraethoxysilane present in excess of that required for the chain end-linking process. Transmission electron micrographs showed well-dispersed and unagglomerated silica particles, and thermogravimetric analysis indicated that the silica particles gave some improvements in thermal stability. In the tearing tests, “stick-slip” tearing was observed at higher rates, especially for the filled networks. The tear strengths were found to increase with increase in the amount of silica incorporated, with the largest increases occurring at the low silica contents.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 576: Symposium DD – Organic/Inorganic Hybrid Materials II , 1999 , 331
Copyright
Copyright © Materials Research Society 1999

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