Abstract
The results of investigations of the dynamic mechanical properties of binary mixtures of rubbers of different molecular weights with a narrow MWD show that for these systems with a bimodal MWD a relaxation process takes place in the high elastic state. It was found that the frequency position of the relaxation region is a function of the molecular weight of the low molecular component of the mixture—the reciprocal frequency is proportional to the molecular weight to the power of 3·2. A mechanical model is proposed which is capable of predicting the relaxation transition of interest and of determining its frequency position; the parameters of the model are fixed by the viscous-elastic properties of the starting rubbers of different molecular weights.
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