Abstract
In order to explain the mechanism of elasticity of a number of diene block-copolymers with linear and radial structure of macromolecules by deformation calorimetry, a study was made of the dependence of the heat and energy of uniaxial reversible elongation on deformation up to an elongation of 1000%. Thermodynamic analysis showed that the proportion of intramolecular changes in entropy and energy is independent of deformation. The joint study of results of thermoelasticity and analysis according to the Mooney-Rivlin equation suggests that gradients in the region of high deformations is the consequence of deformation of polystyrene domains and not of limited extensibility of elastomer chains, as is usually assumed for high deformations of elastomers.
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