• Studies of Liquid Crystal Alignment on the Surface of Polyvinylfluorocinnamate Photoalignment Layer
  • Lee BH, Ham SK, Lim JC, Song K
  • Polyvinylfluorocinnamate 광배향막 표면에서의 액정배향에 관한 연구
  • 이병현, 함성근, 임지철, 송기국
Abstract
In order to understand the induction mechanism of the liquid crystal director, structural changes of photosensitive polyvinylfluorocinnamate with UV irradiation were investigated using FTIR and UV/Vis spectroscopy. It was found that optical anisotropy was induced in the film by irradiation of linearly polarized UV light onto the isotropic polymer film, and such anisotropy in the film determined the direction of the liquid crystal director. The groups in the polymer, which are preferentially aligned perpendicular to the polarization direction after the UV exposure, induce liquid crystal alignment perpendicular to the polarization direction of UV via dispersive intermolecular interactions.

광배향에 의하여 액정의 방향자가 유도되는 메카니즘을 이해하기 위하여 광반웅성 고분자인 polyvinylfluorocinnamate의 UV 조사에 따른 구조변화를 FTIR과 UV/vis spectroscopy를 이용하여 조사하였다. 선편광이 된 UV를 등방성의 고분자 필름에 조사하여 필름 내에 광학적 anisotropy가 형성되는 것을 확인하였고 이러한 배향막의 anisotropy에 의하여 액정의 방향자가 결정되는 것을 알 수 있었다. 광조사에 의하여 UV의 편광방향과 수직으로 늘어서체 된 고분자 사슬내의 group들이 분산력에 의하여 액정분자의 배향을 조사된 UV의 편광방향과 수직인 방향으로 유도하는 것이다.

Keywords: liquid crystal; photoalignment; polarized light; spectroscopy

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  • Polymer(Korea) 폴리머
  • Frequency : Bimonthly(odd)
    ISSN 0379-153X(Print)
    ISSN 2234-8077(Online)
    Abbr. Polym. Korea
  • 2024 Impact Factor : 0.6
  • Indexed in SCIE

This Article

  • 1997; 21(6): 1059-1065

    Published online Nov 25, 1997