Study of the Ultimate Properties of Rubbers : Report 1,Dependence of the Ultimate Properties of an SBR on Strain Rate and Temperature

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The time and temperature-dependent ultimate properties of an unfilled SBR was investigated at several strain rates and at ten temperatures between 40 and -57℃. The results obtained are as follows : 1) The time and temperature superposition of the ultimate strain of an unfilled SBR is almost the same as given by W.L.F.'s equation. 2) For the tensile stress at break, the superposition could not be admitted without consideration of the effect of the testing strain rate in respect to the local disproportion of deformation of the cold drawing, especially at low temperatures. 3) The time and temperature-independent failure envelope of unfilled SBR seems to suggest two different types of fracture mechanism. One will be predominant for the fracture of SBR when the material behaves rubber-like at high temperature and another when the material behaves viscoelastically at low temperature. And the substitution of predominance occurs at a particular condition of strain rate and temperature.
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