Directional behaviour of liquid crystals on homogeneous polyimide surfaces induced by polarised ultraviolet exposure and rubbing

Hyun Jae Na, Won Kyu Lee, Ji Hun Lim, Byoung Yong Kim, Young Hwan Kim, Chul Ho Ok, Dae Shik Seo, Sang Do Lee, Jae Hoon Lee, Jong Gyu La

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Abstract

We studied liquid crystal (LCs) alignment effects on homogeneous polyimide (PI) surfaces induced by polarised UV (PUV) exposure and rubbing in different directions. We found that the LC orientation is not affected by PUV exposure times of less than 90 min after rubbing, and that PUV exposure times over 90 min after rubbing resulted in LC orientations that were more closely aligned with the direction of PUV exposure than the direction of rubbing. Short-term PUV exposure affects the variation of the pretilt angle of the PI and LC. In addition, as PUV exposure time increases, it can convert the LC alignment direction from the rubbing direction to the PUV direction.

Original languageEnglish
Pages (from-to)109-114
Number of pages6
JournalLiquid Crystals
Volume37
Issue number1
DOIs
Publication statusPublished - 2010 Jan 1

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All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics

Cite this

Na, H. J., Lee, W. K., Lim, J. H., Kim, B. Y., Kim, Y. H., Ok, C. H., Seo, D. S., Lee, S. D., Lee, J. H., & La, J. G. (2010). Directional behaviour of liquid crystals on homogeneous polyimide surfaces induced by polarised ultraviolet exposure and rubbing. Liquid Crystals, 37(1), 109-114. https://doi.org/10.1080/02678290903390973