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Abstract

Both static and dynamic properties were determined for a number of rubbery vulcanizates. Selected compositional, processing, de sign, and testing variables have been evaluated and discussed for a group of general-purpose elastomers, with emphasis on natural rubber (NR) and styrene-butadiene (SBR) compositions. Compositional variables such as carbon black, plasticizer, and curing system have an important influence on dynamic properties and some compositional variables selectively influence either the dynamic stiffness or damping characteristics. Variations in mixing are also shown to influence dynamic properties critically, especially at low testing strains. Cure time variations cause different dynamic responses as a function of elastomer type (NR versus SBR). Design in fluences on both static and dynamic properties are described. Increasing static preload in compression tests causes an increase in both the spring rate and the damping coefficient. The loss in dynamic stiffness, caused by prestrain, is shown to be recoverable through application of a suitable heat cycle.

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Factors Controlling the Dynamic Properties of Elastomeric Products

Abstract

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