한국정보디스플레이학회:학술대회논문집

The Korean Infomation Display Society (한국정보디스플레이학회)
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Mechanisms of Photoalignment of Liquid Crystals on Polyvinyl-fluoro-cinnamate

  • Buluy, O. (Institute of Physics pr.) ;
  • Gerus, I. (Institute of Bioorganic Chemistry and Petrochemistry) ;
  • Nobili, M. (Groupe de Dynamique des Phases Condensees, Universite Montpellier II) ;
  • Reznikov, Yu. (Institute of Physics pr.) ;
  • Kim, Dong-Soo (Dept. Of Chemical Engineering, Keimyung University) ;
  • Ha, Ki-Ryong (Dept. Of Chemical Engineering, Keimyung University)
  • Published : 2006.08.22
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Abstract

In order to understand the origin of liquid crystal orientation on a surface of photoaligning polymer polyvinyl-fluoro-cinnamate (PVCN-F), we used FTIR, AFM, UV/Vis and XPS techniques as well as we studied the rejuvenation of the photoalignment after repeated UV exposure with mutually perpendicular polarization. We found that both photodimerization of cinnamoil moieties and their trans-cis isomerisation contribute to the light-induced anchoring on PVCN-F surface, and trans-cis isomerisation is responsible for the rejuvenation of the photoalignment.

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