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Stress–temperature measurements have been obtained for a butyl rubber strip, held in simple elongation at constant volume. The results have been used to evaluate the energetic component of the total elastic force. The results are compared with similar data, previously reported, for natural rubber, and with data based on indirect estimates of (∂ƒ/∂ T ) LV . The energetic contribution to the elastic retractive force was found to be of opposite sign to that reported for natural rubber, being small and negative. Dilation coefficients have also been estimated from a subsidiary experiment and the results compared with the predictions of current elasticity theory.
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Allen et al. (1968) studied this question.
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