Study of Super Olefine Polymer by the Control of Nano-Order Structure I. Mechanical Properties and Morphology of the Polypropylene and Ethylene-Propylene Rubber Blends.

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  • NOMURA Takao
    Material Research and Development Div. 2, Toyota Motor Corporation
  • NISHIO Takeyoshi
    Material Research and Development Div. 2, Toyota Motor Corporation
  • SATO Hiroki
    Yokkaichi Research Center, Mitsubishi Petrochemical Co., Ltd.
  • SANO Hironari
    Yokkaichi Research Center, Mitsubishi Petrochemical Co., Ltd.

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Other Title
  • ナノ・オーダーで高次構造が制御されたスーパー・オレフィンポリマーに関する研究　第１報　ポリプロピレン／エチレンプロピレンゴム系ポリマーブレンドの力学的特性とモルフォロジーの関係
  • ポリプロピレン エチレンプロピレンゴムケイ ポリマー ブレンド ノ リキガクテ

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Description

A blend of impact-resistant poly (propylene-ethylene) copolymer and 20-30wt% of ethylene-propylene rubber (EPR) is widely used in the outer parts of automobiles. The properties of the material can not be fully explained on the basis of the generally accepted morphological model of polypropylene (PP) matrix and EPR domains. In this report, a morphological model composed of PP crystaline lamella domains distributed in a matrix consisting of networked amorphous PP and EPR is proposed, based on the detailed investigation by transmission electron microscopy (TEM), and visco-elastic and pulsed NMR measurements. This new morphological model reasonably explains several phenomena, such as the constancy of the impact strength and the elongation at break measured as a function of molecular weight of PP and the discontinuity in the Rockwell hardness and heat sag observed as a function of EPR content.

Journal

  • KOBUNSHI RONBUNSHU

    KOBUNSHI RONBUNSHU 50 (1), 19-25, 1993

    The Society of Polymer Science, Japan

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