Studies on the Thermochemistry of the Vulcanization of Rubber. VII. Heating Curves for the Vulcanization of the System: Raw Rubber—Sulfur (2)

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Abstract
1. Vulcanization of raw rubber by sulfur is preceded by an endothermic reaction from fusion of the sulfur. 2. Vulcanization of raw rubber is always accompanied by an exothermic reaction. 3. There is a definite time interval between the endothermic and exothermic reactions. 4. The exothermic reaction increases proportionally to the amounts of sulfur used in compounding until the point of theoretical saturation is reached. 5. The time of starting of the exothermic reaction is not influenced by the proportion of sulfur but is uniformly the same. 6. There is no endothermic reaction after the vulcanization reaction has begun, and there is but one exothermic reaction during the vulcanization. The reaction does not proceed in steps.

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