The Evolution of Heat during Vulcanization

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Abstract
An experimental apparatus has been developed by means of which it is possible to measure with a high degree of precision the heats of vulcanization of rubber mixtures containing even very low percentages of sulfur, at temperatures as low as 110° C. Studies of vulcanization on a strictly thermochemical basis now appear both practicable and promising. An evolution of heat of vulcanization is accompanied by an improvement in the mechanical properties of a rubber mixture. The quantity of heat evolved does not seem to be a linear function of the percentage of combined sulfur, at least for low percentages.

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