延伸高分子フィルム再延伸時の変形機構解析第1報 分子鎖の再配向機構
Analysis of Deformation Mechanism with Re-stretching of Stretched Polymer FilmPart I : Re-orientating Mechanism of Molecular Chain
劉 源・日比貞雄・坂本雄二・高橋清久
Liu, Yuan / Hibi, Sadao / Sakamoto, Yuji / Takahashi, Kiyohisa
The re-orientation of the molecular chain axis under plastic deformation was investigated for the off-axis angle stretching of biaxially stretched poly (ethylene terephthalate) (PET) and isotactic polypropylene (it-PP) films using a linear representation of the molecular chain vectors and the extinction direction. The strain changes caused by the re-stretching were further analyzed using a local coordinate system. The re-stretching deformation of PET and it-PP films does not lead to a change in thickness and is caused by a pure shear stress in the plane parallel to the re-stretching and width directions. This same tendency was observed in HDPE film.
Key words: Re-stretching / Extinction direction / Molecular chain vector / Poly (ethylene terephthalate) film / Isotactic polypropylene film