熱老化した油展SBRの張力ー伸度曲線の推定

概要

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A contribution of the crosslinks changed in character by aging in oil-extended SBR vulcanizates to the stress-strain relation was examined with the following theoretical constitutive equation : f={G-B(1-1/α)+C(α2-1)+D(α+1/α2-2)+f(α4-1}(α-1/α2) where f is nominal stress at an extension ratio α, G corresponds to rigidity, B, C, D, and F are coefficients. The experimental stress-strain relations of oil-extended SBR vulcanizates aged for various periods of time at 100°C coincided with the above relation in the extension range almost up to the break. The dependence of each coefficient on the crosslink densities was examined and found that a part of the crosslink density in aged oil-extended SBR was effective on the stress. The rate of the effective crosslink densities for each coefficient was determined for each period of aging time. On the basis of the effective crosslink densities, a method estimating the stress-strain curves of aged oil-extended SBR vulcanizate was proposed.
日本レオロジー学会の論文
1999-06-15