Studies on Double Orientation and Crystal Modifications of Stretched Polyester Films

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Other Title
  • 延伸ポリエステルフィルムの二重配向と結晶変態に関する研究
  • エンシン ポリエステル フィルム ノ ニジュウハイコウ ト ケッショウ ヘンタイ ニ カンスル ケンキュウ

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Description

Uniaxially stretched poly(ethylene) terephthalate (PET) and poly(butylene) terephthalate (PBT) films made by a roll stretching method have been characterized by wide angle X-ray diffraction and infrared spectroscopy. Wide angle X-ray diffraction photographs were taken from the three directions (through, edge, and end) for each film, and their double orientation was evaluated. The ratios of the α and β crystal forms of PBT were calculated from infrared spectroscopy data. It was confirmed that both, the ratio of the β form crystal increased and the degree of double orientation of PET and PBT increased as the draw ratio increased. The crystals of PET and the β form crystal of PBT show a planar zig-zag conformation of the methylene residue in the benzene ring plane. They take an extremely flat structure. It is concluded that a flat structure parallel to the film surface is the reason for the double orientation of PET and PBT films.<br>

Journal

  • KOBUNSHI RONBUNSHU

    KOBUNSHI RONBUNSHU 66 (12), 598-604, 2009

    The Society of Polymer Science, Japan

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