The purpose of this study is to clarify the effect of drawing history on molecular orientation and crystallizationbehavior in sequential biaxial stretching of poly(ethylene terephthalate) (PET) film. PET films were stretched tothe draw ratios of 3.5x3.0 and 3.0x3.5 keeping a constant width during each drawing step. Analyses of 3-Doptical anisotropy and wide-angle X-ray diffraction pattern of films after the first and second drawing andheat-setting processes suggested that the second drawing is more effective for the in-plane anisotropy, and thatthe uniplanar orientation of (100) is promoted through the annealing process. Estimation of the intrinsicbirefringences for the planar orientation of c-axis and the uniplanar orientation of (100) suggested that the orientation of benzene ring in the film plane greatly contributed to the development of large optical anisotropy.
各種検索
サポート
ヘルプ