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Thermoelastic measurements were carried out for acrylic copolymers in simple shear. Samples were synthesized by UV photopolymerization. It is shown that the energy contribution to rubber elasticity (fe/f) can be readily calculated from the temperature coefficient of shear modulus. The value of f e /f for poly(n-butyl acrylate) thus obtained is in excellent agreement with that determined in uniaxial elongation. Energy contributions were found to vary as a function of temperature. Values of f e/f for the copolymers are intermediate between those of the parent homo-polymers as long as thermoelastic measurements were carried out at a temperature sufficiently greater than the glass transition temperature of the polymer.
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Chen et al. (1973) studied this question.
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