Abstract
AbstractThe temperature coefficient of vulcanization for SBR hard rubber polyblends has been determined to be approximately 2.0 for 10°C. intervals of temperature. Higher percentages of sulfur give faster rates of cure and higher glass transition temperatures. Ti at 109 provides a convenient index to the degree of vulcanization of the mixtures. The response of hard rubber polyblends to variations in time and temperature of vulcanization and to changes in the proportion of sulfur in the recipe are similar to those found for conventional rubber recipes. Vulcanization parameters for hard rubber polyblends may therefore be estimated according to procedures found valid for nonpolyblend hard rubber mixtures.
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