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Mechanisms for variations in electrical properties of silicone rubber vulcanized by the condensation reaction
Author(s) -
Yokoyama T.,
Kinjo N.,
Wakashima Y.
Publication year - 1986
Publication title -
polymer engineering and science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.503
H-Index - 111
eISSN - 1548-2634
pISSN - 0032-3888
DOI - 10.1002/pen.760261305
Subject(s) - vulcanization , silicone rubber , materials science , catalysis , condensation , composite material , natural rubber , alkoxy group , polymer chemistry , chemical engineering , organic chemistry , chemistry , thermodynamics , physics , alkyl , engineering
The electrical conductivity and the dissipation factor of silicone rubber vulcanized by the condensation reaction of α,ω‐dihydroxypolysiloxane with ethoxysilane, using dibutyltin dilaurate as a catalyst, were studied. Rubber specimens, with different amounts of catalyst, were prepared using various vulcanization times and then heat treated in dry or wet atmospheres containing oxygen and nitrogen. The electrical properties of these specimens were measured at 20 to 200°C in dry air. The amounts of residual catalysts and unreacted ethoxy groups were analyzed by colorimetric and gas chromatographic methods. Factors influencing the specimen electrical properties were discussed in terms of preparation conditions and amount of residual compounds.