Conversion of Hydrophilic Surface of Poly(ethylene terephthalate) Film to Hydrophobic One under Hydrophilic Conditions

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  • SUZUKI Yasuyuki
    Department of Organic and Polymer Materials Chemistry, Tokyo University of Agriculture and Technology
  • LI Jun
    Department of Material Development, Takasaki Radiation Chemistry Research Establishment, Japan Atomic Energy Research Institute
  • MAEKAWA Yasunari
    Department of Material Development, Takasaki Radiation Chemistry Research Establishment, Japan Atomic Energy Research Institute
  • YOSHIDA Masaru
    Department of Material Development, Takasaki Radiation Chemistry Research Establishment, Japan Atomic Energy Research Institute
  • MAEYAMA Katsuya
    Department of Organic and Polymer Materials Chemistry, Tokyo University of Agriculture and Technology
  • YONEZAWA Noriyuki
    Department of Organic and Polymer Materials Chemistry, Tokyo University of Agriculture and Technology

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Other Title
  • 親水性ポリエチレンテレフタレート膜表面の親水的環境下での疎水化

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The hydrophilic surface of poly(ethylene terephthalate) (PET) film, obtained by partial hydrolysis, was converted to hydrophobic one under dry air, saturated water vapor atmosphere, nitrogen, and vacuum at temperatures ranging from 0 to 80 °C. The hydrophilicity of the surface increased significantly faster under the saturated water vapor although it was the most hydrophilic in the examined conditions. From the dependence of the absolute temperature on the rate of hydrophilicity change for each storage condition, a discontinuous point at ca. 50 °C was observable only under the water vapor condition. This relation indicates that the appreciable acceleration of the hydrophilicity change on the surface under the hydrophilic condition might be resulted from the increase of the surface mobility due to the water adsorption on the PET surface.

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