Abstract

Thermal aging at a high temperature was investigated in relation to the network concentration in vulcanized rubber. Intermittent stress relaxation of vulcanized rubber was studied using a Geer oven under conditions similar to those of the aging test. It was found that sulphur-zinc oxide mixed rubber had a slow rate of crosslinking and a fast relaxation and tetramethyl thiuram disulphide (TMTD)-zinc oxide mixed rubber had a fast rate of crosslinking and a slow relaxation. The equation for the change in network concentration with time was derived from the results.

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