Abstract
An experimental study has been carried out to specify the nonlinear viscoelastic behavior of noncrystalline peroxide‐cured EPDM networks covering a range in elongation ratios between one and seven. Stress‐strain curves, measured at constant rates of elongation at 300, 345, and 390 K, are analyzed with two recently published methods. Time and strain effects are shown to be separable. The nonlinear strain measure, determined at various stretching rates, is studied as a function of temperature, cross‐link density, and prepolymer type. These results are compared with the strain measures of two phenomenological theories, namely with the Mooney‐Rivlin equation and a constitutive equation which contains the nonlinear n measure of strain, and with the predictions of the molecular theory of elasticity of polymer networks developed by Flory.
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