エチレン-プロピレンゴムのペルオキシド加硫におけるオキシム化合物の効果

概要

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The effects of various oxime compounds in the dicumyl peroxide cure of ethylene-propylene rubber were studied. From the results, it was found that : (1) The crosslinking density of the cured rubber increased with increase in the amount of oxime compounds, when the amount of dicumyl peroxide was limited. The effective molar ratio of the oxime compounds to dicumyl peroxide was less than about 1.0. (2) The crosslinking effects of p. p′-dibenzoyl quinone dioxime was greater than those of pdquinone dioxime. It seems that the crosslinking reaction proceeded with the benzoyl radicals and the oxime radicals. It seems also that the benzoyl radicals were formed by the decomposition of the p. p′-dibenzoyl quinone dioxime. (3) The mechanism of the chemical reaction of the oxime compunds may be explained as follows : The oxime compounds inhibit the scissions of the main chain by the reaction with the tert.-radicals formed in propylene units of ethylene-propylene rubber.