Control of Liquid Crystal Alignment on Crosslinkable Polymer Surfaces with Photo and Plasma Modification

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  • Rumiko Yamaguchi
    Department of Electrical and Electronic Engineering, Akita University
  • Toru Kawamura
    Department of Electrical and Electronic Engineering, Akita University
  • Yasuhiro Sato
    Department of Electrical and Electronic Engineering, Akita University
  • Susumu Sato
    Department of Electrical and Electronic Engineering, Akita University

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Photo and plasma surface modifications and rubbing treatment are carried out on a polymer film to change the liquid crystal alignment properties. The side chains of the polymer are crosslinked by the photo and plasma irradiations. Liquid crystal molecules uniformly align perpendicular to the rubbing direction on the unmodified surface. On the other hand, the molecules align parallel on the modified surface. The dichroism of the polarized UV absorption to the rubbing direction is positive in the modified film as compared to the negative dichroism in the unmodified film. The sign of the dichroism is reasonable to explain easy axes of modified and unmodified film surface.

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