Non-Entropy Elasticity of a Highly Stretched Pure Rubber.

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  • YAMASHITA Yoshihiro
    Department of Materials Science, School of Engineering, The University of Shiga Prefecture
  • KAWABATA Sueo
    Department of Materials Science, School of Engineering, The University of Shiga Prefecture

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Other Title
  • 高伸長下における純ゴムの非エントロピー弾性
  • コウ シンチョウ カ ニ オケル ジュンゴム ノ ヒエントロピー ダンセイ

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This research investigates the temperature dependence of pure rubber in a stretched state. The motivation for this investigation is a desire to validate the theory on the reinforcement mechanism of rubber by carbon black which we proposed previously in 1982. The structure model of this reinforcement system is a super-network of stretched molecular chains. The reinforcement effect is represented by a separated term, called the γ term, in a strain energy density function (W function) and it has been observed that this γ term has no temperature dependence. The classical rubber elasticity theory, however, predicts that the molecular chains display entropy elasticity even in the nongaussian region, when in a highly extended state. This implies that the γ term must be temperature dependent. In order to clarify this problem, we have determined a W function for isoprene rubber that is highly stretched from the measured results by the strip-biaxial extension method. Then we have the conclusion that the W function in the highly extended state is not temperature dependent, because the temperature dependence of ∂W/∂I1 becomes very small for the extension ratio greater than 6.5(I1=43).

Journal

  • NIPPON GOMU KYOKAISHI

    NIPPON GOMU KYOKAISHI 74 (5), 191-195, 2001

    THE SOCIRETY OF RUBBER SCIENCE AND TECHNOLOGYY, JAPAN

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