Fabrication of Polarizing Poly (ethylene terephthalate) Films Using Dichroic Dyes and Their Properties

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  • AKAGI Nobuo
    Showakako Corporation Department of Applied Chemistry, Graduate School of Engineering, Osaka Prefecture University
  • YAGI Shigeyuki
    Department of Applied Chemistry, Graduate School of Engineering, Osaka Prefecture University
  • NAKAZUMI Hiroyuki
    Department of Applied Chemistry, Graduate School of Engineering, Osaka Prefecture University

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  • ポリエチレンテレフタレートフィルムを基材とする二色性色素を用いた偏光フィルムの作製とその特性
  • ポリエチレンテレフタレート フィルム オ キザイ ト スル 2ショクセイ シキソ オ モチイタ ヘンコウ フィルム ノ サクセイ ト ソノ トクセイ

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Conventional polarizing poly(ethylene terephthalate) (PET) films were manufactured from uniaxially super-extended PET films dyed using azo dichroic dyes with high dichroic ratio in a high-pressure dyeing process and their polarizing properties were investigated.<br>Molecular orbital calculations for commercially available disazo dichroic dyes predict their linear structures favor the alignment of the dye along the drawing direction of the PET.<br>Uniaxially super-extended PET films dyed by this process provide dichroic ratios as high as 7.86–10.2 and degrees of polarization as high as 89–98%. The optical anisotropy is strongly dependent on the molecular structure of the chromophore in the dye.<br>A polarizing PET film with x, y chromaticity coordinates of [0.31, 0.31] and degree of polarization of 99% was successfully manufactured from uniaxially super-extended PET film dyed with three kinds of azo dichroic dyes using this process and shows superior humidity resistance.

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