Thermoelastic measurements were performed for four rubbery copolymers: Viton A, ethylene-propylene rubber (EPR), Hycar, and styrene-butadiene rubber (SBR). The relative energy contribution, fe/f, for these elastomers were calculated by means of a recently proposed equation which is based on the temperature coefficient of shear modulus. It was found that the relative energy contribution or the temperature coefficients of the unperturbed dimensions of EPR and SBR are not simply related to those of the parent homopolymers. In addition, the copolymers appear to bear an opposite sign compared with the homopolymers. The thermoelastic behavior of one elastomer, Viton A, was investigated over a 200°C range up to high loads. Linear relations were obeyed within experimental error. Calculations on the basis of statistical theory of rubber elasticity shows that this is to be expected for elastomers that are Gaussian in behavior.
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Cirlin et al. (1971) studied this question.
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