Control of easy axes on rubbed polyvinyl-cinnamate alignment film by materials of nematic liquid crystal

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  • Yamaguchi Rumiko
    Department of Electrical and Electronic Engineering Graduate School of Engineering and Resource Science
  • Ikeya Masaki
    Department of Electrical and Electronic Engineering Graduate School of Engineering and Resource Science

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Other Title
  • ネマチック液晶材料によるポリビニルシンナメート配向膜の容易軸制御(発光型/非発光型ディスプレイ合同研究会)
  • ネマチック液晶材料によるポリビニルシンナメート配向膜の容易軸制御
  • ネマチック エキショウ ザイリョウ ニ ヨル ポリビニルシンナメートハイコウ マク ノ ヨウイジク セイギョ

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Abstract

Polyvinyl-cinnamate (PVCi) is well known as a photo crosslinkable polymer to align liquid crystal (LC) molecules by a linearly polarized UV (LPUV) light exposure. In addition, it has been recognized that the easy axis is perpendicular to the rubbing direction, since sidechains of PVCi are oriented perpendicular to the main chains. However, we found that MBBA (N-p-methoxybenzylidene p-n-butylaniline) aligns parallel to the rubbing direction. In this study, the in-plane easy axis of LCs with different chemical structures has been investigated on the rubbed PVCi surface. We reported that LCs with and without polar groups aligned perpendicular and parallel to a rubbing direction on a rubbed PVCi surface, respectively. Easy axis control of the PVCi was realized by mixing LCs and an alignment patterning was successfully demonstrated on crosslinked and uncrosslinked surfaces by exposing with and without unpolarized UV light.

Journal

  • ITE Technical Report

    ITE Technical Report 35.4 (0), 79-82, 2011

    The Institute of Image Information and Television Engineers

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