Molecular Behavior in Uniaxial Drawing of Preoriented Isotactic Polypropylene Sheet

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  • YAMADA Kenji
    Department of Applied Chemistry, Faculty of Engineering, Kyushu University
  • TAKAYANAGI Motowo
    Department of Applied Chemistry, Faculty of Engineering, Kyushu University

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Other Title
  • アイソタクチックポリプロピレン配向試料の１軸伸長における分子鎖の挙動
  • アイソタクチック ポリプロピレン ハイコウ シリョウ ノ 1ジク シンチョウ

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Abstract

Superstructural variation of reoriented isotactic polypropylene sheet during uniaxial extension was followed by the wide-angle X-ray diffraction (WAXD) and the small-angle X-ray scattering (SAXS), The shear deformation of the crystallites (A2 process) and the restoration of molecular orientation from the shear-deformed state (A2 process) were distinguished by X-ray goniometries using WAXD and SAXS. The crystallite thickness depends on the testing temperature after the initiation of the A2 Process. The tensile stress along the chain direction aueleratedly increased after the initiation of the A2 process. The behavior of molecular chains in the A2 process can be explained as a result of the refolding of extending tie molecules to form new crystallites after they are pulled out of crystallites by overcoming the intermolecular force to restrain them in the crystallites.

Journal

  • KOBUNSHI RONBUNSHU

    KOBUNSHI RONBUNSHU 34 (6), 465-474, 1977

    The Society of Polymer Science, Japan

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