Study on <i>Cis-trans</i> Isomerization in Diene Rubbers during Vulcanization

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  • YOSHIMOTO Koya
    Graduate School of Chemical Sciences and Technology, Tokyo University of Science
  • ITO Masayoshi
    Graduate School of Chemical Sciences and Technology, Tokyo University of Science

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Other Title
  • 加硫反応過程におけるジエン系ゴムのシス-トランス異性化反応に関する研究
  • カリュウハンノウ カテイ ニ オケル ジエンケイ ゴム ノ シス-トランス イセイカ ハンノウ ニ カンスル ケンキュウ
  • Study on Cis-trans Isomerization in Diene Rubbers during Vulcanization

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Abstract

It is well known that a part of cis-1,4 double bonds in diene rubbers is converted to trans-1,4 double bonds during the vulcanization, which is called cis-trans isomerization. In this article, effects of compounding ingredients on the cis-trans isomerization were studied by using electron spin resonance (ESR) and solid-state 13C-NMR results. The combination of ESR and NMR results revealed that the cis-trans isomerization was induced by a side reaction of the vulcanization by sulfur radicals. It was also found that the cis-trans isomerization was suppressed by zinc oxide. It is suggested that the reactivity of free sulfur radicals is enhanced by zinc oxide, resulting in the formation of C-S linkages on polymer chains.

Journal

  • NIPPON GOMU KYOKAISHI

    NIPPON GOMU KYOKAISHI 85 (3), 87-92, 2012

    THE SOCIRETY OF RUBBER SCIENCE AND TECHNOLOGYY, JAPAN

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