Fundamental Studies of Rubber Blends

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Abstract
To sum up our findings on the requirements for rubber blends with vulcanizate properties arithmetically interpolated between those of the constituent rubbers one needs: (a) Rubbers which have similar values of solubility parameter and which also yield blends whose vulcanizates exhibit a single glass transition temperature. (b) Rubbers of similar viscosity. (c) Mixing methods capable of giving good disaggregation of compounding ingredients and satisfactory distribution between the constituent rubbers. (d) Rubbers of similar curative requirement and cure rate and curative systems capable of giving interlocked networks. (e) Suitable choice of plasticizer, which may offset slight deficiencies in (a) and (b). There still remain many unanswered questions, which it is hoped will be answered in future research.

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