THE CROSS-LINKING OF METHYL-VINYL SILICONES WITH ORGANIC PEROXIDES.
ROYAL AIRCRAFT ESTABLISHMENT FARNBOROUGH (UNITED KINGDOM)
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A study of the cross-linking efficiency of selected organic peroxides in silicone gum and of the mechanical properties, heat stability, and processing of the resulting vulcanisates indicates that 2.5 dimethyl 2.5 ditertiary butyl peroxy hexane is to be preferred to the dichlorobenzoyl peroxide normally used. Vulcanisates produced with this peroxide give a better all around level of properties with a much more economical cure cycle, and there are indications that substantially improved heat aging properties could be obtained if a suitable alternative to fine silica as a reinforcing filler could be found. Author