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Collapse of Homeotropic Liquid-Crystal Alignment by Increased Molecular Packing on Comb-Like Polymer Surfaces

Authors

  • Dr. Eun-Ho Sohn,

    1. Department of Advanced Materials Engineering for Information & Electronics, Kyung Hee University, 446-701 Seoul (South Korea)
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  • Dr. Hyo Kang,

    1. Energy Lab. Samsung Advanced Institute of Technology, Samsung Electronics Co. Ltd. 446-712 Seoul (South Korea)
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  • Dong-Gyun Kim,

    1. Department of Chemical and Biological Engineering and Institute of Chemical Process, Seoul National University, 151-744 Seoul (South Korea), Fax: (+82) 2-888-1604
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  • Prof. Dr. Kigook Song,

    1. Department of Advanced Materials Engineering for Information & Electronics, Kyung Hee University, 446-701 Seoul (South Korea)
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  • Prof. Dr. Jong-Chan Lee

    Corresponding author
    1. Department of Chemical and Biological Engineering and Institute of Chemical Process, Seoul National University, 151-744 Seoul (South Korea), Fax: (+82) 2-888-1604
    • Department of Chemical and Biological Engineering and Institute of Chemical Process, Seoul National University, 151-744 Seoul (South Korea), Fax: (+82) 2-888-1604
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Abstract

We report an unusual alignment behavior of liquid crystals (LCs) on well-ordered comb-like poly(oxyethylene) surfaces. The homeotropic LC alignments that are observed on as-coated surfaces of the polymers are transformed to the random planar type after annealing treatment, even though the molecular structure of the polymer surface becomes more ordered and the surface energy decreases. Studies of the surface properties, such as molecular structure, morphology, and wettability, reveal that such an unexpected alteration of the LC alignment originates from the density of the alkyl side chains being enhanced by localized packing.

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