한국정보디스플레이학회:학술대회논문집

The Korean Infomation Display Society (한국정보디스플레이학회)
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Detailed Investigation on Factors Governing Liquid Crystal Alignment on Rubbed Polystyrene Films

  • Hahm, Seok-Gyu (Department of Chemistry, Center for Integrated Molecular Systems, Division of Molecular and Life Sciences, BK21 Program, and Polymer Research Institute, Pohang University of Science and Technology) ;
  • Lee, Taek-Joon (Department of Chemistry, Center for Integrated Molecular Systems, Division of Molecular and Life Sciences, BK21 Program, and Polymer Research Institute, Pohang University of Science and Technology) ;
  • Lee, Seung-Woo (Department of Chemistry, Center for Integrated Molecular Systems, Division of Molecular and Life Sciences, BK21 Program, and Polymer Research Institute, Pohang University of Science and Technology) ;
  • Yoon, Jin-Hwan (Department of Chemistry, Center for Integrated Molecular Systems, Division of Molecular and Life Sciences, BK21 Program, and Polymer Research Institute, Pohang University of Science and Technology) ;
  • Kim, Gha-Hee (Department of Chemistry, Center for Integrated Molecular Systems, Division of Molecular and Life Sciences, BK21 Program, and Polymer Research Institute, Pohang University of Science and Technology) ;
  • Chang, Tai-Hyun (Department of Chemistry, Center for Integrated Molecular Systems, Division of Molecular and Life Sciences, BK21 Program, and Polymer Research Institute, Pohang University of Science and Technology) ;
  • Ree, Moon-Hor (Department of Chemistry, Center for Integrated Molecular Systems, Division of Molecular and Life Sciences, BK21 Program, and Polymer Research Institute, Pohang University of Science and Technology)
  • Published : 2004.08.23
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Abstract

The molecular reorientations and surface morphologies of rubbed films formed from atactic polystyrene (PS) samples with various molecular weights were investigated in detail. Previously unknown surface topography features were newly discovered in rubbed films, depending on molecular weights: submicroscale groove-like meandering structures composed of fine-grooves like pebbles in tens nanometers are present, oriented perpendicular to the rubbing direction. The vinyl main chains, however, were preferentially reoriented along the rubbing direction and the planes of the phenyl side groups were preferentially reoriented perpendicular to the rubbing direction with para-directions that were positioned nearly normal to the film plane. Nematic liquid crystal (LC) molecules were found to always align on the rubbed PS surfaces along the orientation direction of the submicroscale grooves generated by rubbing.

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