Abstract

Thermodynamic analysis of the relevant equation of state was used to develop a theoretical description of deformation behavior of polymer networks in simple shear. According to the theory, the essential feature of polymer networks subject to simple shear is the absence of “thermoelastic inversion” phenomenon which is typical for the case of the uniaxial extension. Application of deformation calorimetry to study the thermoelastic response of natural rubber to uniaxial stretching and simple shear regimes of deformation revealed both adequate correspondence of theory and experiment, as well as coincidence of material constants of natural rubber derived from these two independent experiments.

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