Generation of pretilt angle and liquid crystal aligning capabilities using a photodimerization method on a photo-polymer surface

Dae Shik Seo, Jeoung Yeon Hwang

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Abstract

Pretilt angles and alignment stability for nematic liquid crystal (NLC) with obliquely polarized UV exposure on the three kinds of photo-polymer were studied. The generated pretilt angle of the NLC was about 2.7° by polarized UV exposure on a PM4Ch (poly(4-methacryloyloxy chalcone))surface for 1 min. But, the low pretilt angle for NLC on a PVCi (poly(vinyl)cinnamate) surface was observed. The pretilt angle generated in NLC is attributed to the photosensitivity by long side chain of the photo-polymer. Also, good thermal stability of the three kinds of photo-polymer were measured until 300 °C by thermogravimetric analysis (TGA) measurement. Finally, the good LC aligning capabilities using the photodimerization method were observed by annealing-treatment until 150 °C.

Original languageEnglish
Pages (from-to)L1239-L1241
JournalJapanese journal of applied physics
Volume39
Issue number12 A
Publication statusPublished - 2000 Dec 1

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All Science Journal Classification (ASJC) codes

  • Engineering(all)
  • Physics and Astronomy(all)

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