Evaluation of the Thermal Stress Relaxation Method for the Estimation of Polysulfidic Crosslinks in Natural Rubber Vulcanizates

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Abstract
The variation of the polysulfidic crosslink content of a natural rubber vulcanizate during cure has been determined from thermal stress relaxation data obtained using a Monsanto Rheometer and the results have been compared with those obtained by chemical probe analysis. No correlation could be found. Attempts to isolate the relaxation due solely to polysulfide crosslink interchange gave no better agreement and it is concluded that competing maturing reactions prevent such a resolution. The first order rate constant for the fast relaxation attributed to polysulfide crosslink exchange reactions has been found to vary in a linear manner with the total crosslink density of the vulcanizates.

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