The Improvement of Plastic Processability of Poly (L-Lactic Acid) Modified by Dicumyl Peroxide

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  • Takagi Jun
    R & D center, Mitsubishi Plastics Inc. Department of Polymer Science and Engineering, Faculty of Engineering, Yamagata University
  • Nemoto Tomoyuki
    R & D center, Mitsubishi Plastics Inc.
  • Miyazaki Munenori
    Department of Polymer Science and Engineering, Faculty of Engineering, Yamagata University
  • Nishioka Akihiro
    Department of Polymer Science and Engineering, Faculty of Engineering, Yamagata University
  • Takimoto Jun-ichi
    Department of Computational Science and Engineering, Graduate School of Engineering, Nagoya University
  • Koyama Kiyohito
    Department of Polymer Science and Engineering, Faculty of Engineering, Yamagata University

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Other Title
  • 過酸化物添加によるポリ（Ｌ‐乳酸）の成形加工性の改良
  • カサンカブツ テンカ ニ ヨル ポリ L ニュウサン ノ セイケイ カコウセイ ノ カイリョウ

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Description

GPC and rheological measurements under shear and uniaxial flow for Poly (L-lactic acid) modified by dicumyl peroxide were carried out. The description of experimental GPC resulted that some amounts of added dicumyl peroxide caused an increase of cross-linked regions in the polymer. The viscoelastic properties of poly (L-lactic acid) modified by dicumyl peroxide under the shear flow were investigated. It was found that the rheological properties of the poly (L-lactic acid) were distinctly different from those of a neat poly (L-lactic acid). The elastic response at low frequencies was significantly enhanced in comparison with the neat poly (L-lactic acid). Uniaxial elongation behavior was also measured. In short time region, the elongational viscosity of Poly (L-lactic acid) modified by dicumyl peroxide were three times larger than the shear viscosity. This result meant that Trouton's rule is applicable to the results. Beyond a certain critical strain, the uniaxial elongational viscosity showed rapid increase, which was referred to as strain hardening. Die-swell ratio increased with dicumyl peroxide contents. Furthermore poly (L-lactic acid) modified by dicumyl peroxide was molded by direct-blow. The thickness distribution could be homogeneous by modified peroxide.

Journal

  • Seikei-Kakou

    Seikei-Kakou 14 (9), 598-603, 2002

    The Japan Society of Polymer Processing

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