Abstract
Abstract This investigation was carried out to discover the terminal group present in polysulfide rubbers of the kind represented by Thiokol Type FA and the chemical reactions involved in the standard vulcanization recipe. Hydroxyl groups were found to be present as terminals on these polysulfide rubbers. The effects on vulcanization of omitting the compounding ingredients normally used, of varying the amounts of zinc oxide, substituting other metallic atoms for zinc, and of using diisocyanates were studied, and the mechanism was deduced. Knowledge of the end groups present in the polymer chain is helpful in planning supplementary experiments to try to discover the chemical reaction involved in the cure with zinc oxide. It also makes it possible to look intelligently for improved vulcanizing agents for these polysulfide polymers.
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