Journal of the Korean Applied Science and Technology (한국응용과학기술학회지)

The Korean Society of Applied Science and Technology (한국응용과학기술학회)
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Phase Separated Structure and Electro-optical Properties of the (Polymer/Liquid Crystal) Composite Films

(고분자/액정) 복합막의 상분리구조와 전기광학 특성

  • Park, K.S. (Materials & Devices Research Center, Samsung Advanced Institute of Technology) ;
  • Noh, C.H. (Materials & Devices Research Center, Samsung Advanced Institute of Technology) ;
  • SaKong, D.S. (Materials & Devices Research Center, Samsung Advanced Institute of Technology) ;
  • Nam, K.D. (Dept. of Chemical Industry, Chungbuk National University) ;
  • Kajiyama, T. (Dept. of Chemical Science & Tech., Faculty of Engineering Kyushu University)
  • 박관선 (삼성종합기술원 신소재응용연구소) ;
  • 노창호 (삼성종합기술원 신소재응용연구소) ;
  • 사공동식 (삼성종합기술원 신소재응용연구소) ;
  • 남기대 (충북대학교 공업화학과) ;
  • 카지야마 (큐슈대학교 공과대학 응용물질화학과)
  • Published : 1995.11.30
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Abstract

The phase separated structure and the electro-optical properties of the (polymer/liquid) crystal : LC) composite film strongly depended on the weight fraction of LC in it. The continuous LC phase was formed in a three-dimensional polymer network when the LC weight fraction was above 40wt%. The aggregation structure of the composite film could be controlled by controlling the solvent evaporation velocity during the film preparation process. The smaller LC domains or channels were formed in the case of the faster solvent evaporation velocity. The composite film exhibited reversible light scattering-light transmission switching upon electric field -OFF and -ON states, respectiverly. The light scattering properties of the composite film strongly depended on the spatial distortion of the nematic directors as well as the mismatch in refractive indices between matrix polymer and LC.

Keywords