Crystallization Behavior of Natural Rubber, Part 3. Effect of Saturated Fatty Acid on Crystallization of cis-1,4-Polyisoprene.

  • KAWAHARA Seiichi
    Department of Chemistry, Nagaoka University of Technology
  • MATSUURA Ai
    Division of Applied Chemistry, Faculty of Technology, Tokyo University of Agriculture and Technology
  • KAKUBO Takashi
    Division of Applied Chemistry, Faculty of Technology, Tokyo University of Agriculture and Technology
  • NISHIYAMA Naoyuki
    Division of Applied Chemistry, Faculty of Technology, Tokyo University of Agriculture and Technology
  • TANAKA Yasuyuki
    Division of Applied Chemistry, Faculty of Technology, Tokyo University of Agriculture and Technology

Bibliographic Information

Other Title
  • 天然ゴムの結晶化挙動の解析 3  IRの結晶化への飽和脂肪酸濃度の効果
  • テンネン ゴム ノ ケッショウカ キョドウ ノ カイセキ ダイ3ポウ IR ノ ケッショウカ エ ノ ホウワ シボウサン ノウド ノ コウカ

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Abstract

Crystallization behavior of synthetic cis-1, 4 polyisoprene (IR), mixed with 0.4×10-2mol/kg_??_4.8×10-2mol/kg saturated fatty acid, was investigated by dilatometry at -25 and -15°C. The crystallization of IR was abruptly promoted by the addition of saturated fatty acids higher than 1.0×10-2mol/kg, such as stearic acid, palmitic acid and myristic acid, respectively, because of the formation of crystalline domain of the fatty acids. But, capric acid did not stimulate the crystallization of IR due to melting at above -25°C and soluble into IR. These demonstarate that the lowest concentration of fatty acids necessary for the acceleration of the crystallization rate of IR was 1.0×10-2mol/kg, when fatty acid formed crystalline domain dispersed in IR matrix. The crystallization of IR was influenced by not only equilibrium crystal structure, but also dynamic deposition of stearic acid from melt, which was confirmed by precooling of the rubber at 0, 10 and 30°C before crystallization at -25°C.

Journal

  • NIPPON GOMU KYOKAISHI

    NIPPON GOMU KYOKAISHI 72 (7), 413-417, 1999

    THE SOCIRETY OF RUBBER SCIENCE AND TECHNOLOGYY, JAPAN

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