Lower Critical Solution Temperature Phase Behavior of Natural Rubber/Polybutadiene Blend.

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  • Kawahara Seiichi
    Department of Chemistry, Faculty of Engineering, Nagaoka University of Technology
  • Asada Yasuhiro
    Department of Chemistry, Faculty of Engineering, Nagaoka University of Technology
  • Isono Yoshinobu
    Department of Chemistry, Faculty of Engineering, Nagaoka University of Technology
  • Muraoka Kiyoshige
    Material & Process Laboratory, Research & Development HQ, Sumitomo Rubber Industries, Ltd.
  • Minagawa Yasuhisa
    Material & Process Laboratory, Research & Development HQ, Sumitomo Rubber Industries, Ltd.

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Abstract

The lower critical solution temperature (LCST) phase behavior of the blend of natural rubber (NR) with polybutadiene (PB) having 32.3% 1,2 unit was investigated by measuring Tg through DSC after annealing the blend. NR was separated with toluene into branched polymer and crosslinked one as a soluble fraction (NR-sol) and gel fraction (NR-gel), respectively, followed by mixing with PB. Coexistence composition of NR-sol/PB and NR-gel/PB blends was determined by a method proposed in this work using DSC. The LCST of the NR-sol/PB blend was 328 K, being identical to the reported LCST of synthetic cis-1,4-polyisoprene/PB blend in our previous paper. The LCST of NR-gel/PB blend was quite similar to that of NR-sol/PB blend despite that NR-gel was crosslinked rubber (ν=1.5×10-6). Molecular weight was proved to produce no effect on the LCST phase behavior for high molecular weight polymer-polymer blend, i.e., NR/PB blend.

Journal

  • Polymer Journal

    Polymer Journal 34 (1), 1-8, 2002

    The Society of Polymer Science, Japan

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