Chang-Lyoul Lee

Publications (3)16.93 Total impact

• Article: Optically active, lyotropic liquid crystalline poly(diphenylacetylene) derivative: hierarchical chiral ordering from isotropic solution to anisotropic solid films.

  Daehoon Lee, Hyojin Kim, Nozomu Suzuki, Michiya Fujiki, Chang-Lyoul Lee, Wang-Eun Lee, Giseop Kwak
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  ABSTRACT: The side chain chirality of a poly(diphenylacetylene) derivative was transferred and amplified spontaneously from solution to a bulk film due to lyotropic liquid crystallinity.
  Chemical Communications 08/2012; 48(74):9275-7. · 6.17 Impact Factor
• Article: Remarkable change in fluorescence emission of poly(diphenylacetylene) film via in situ desilylation reaction: correlation with variations in microporous structure, chain conformation, and lamellar layer distance.

  Wang-Eun Lee, Dong-Cheul Han, Dong-Hee Han, Heung-Jin Choi, Toshikazu Sakaguchi, Chang-Lyoul Lee, Giseop Kwak
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  ABSTRACT: Fluorescence (FL) emission properties, microporous structures, energy-minimized chain conformations, and lamellar layer structures of the silicon-containing poly(diphenylacetylene) derivative of p-PTMSDPA before and after desilylation were investigated. The nitrogen-adsorption isotherms of p-PTMSDPA film before and after desilylation were typical of type I, indicating microporous structures. The BET surface area and pore volume of the p-PTMSDPA film were significantly reduced after the desilylation reaction, simultaneously, its FL emission intensity remarkably decreased. The theoretical calculation on both model compounds of p-PTMSDPA and its desilylated polymer, PDPA, showed a remarkable difference in chain conformation: The side phenyl rings of p-PTMSDPA are discontinuously arranged in a zig-zag pattern, while the PDPA is continuously coiled in a helical manner. The lamellar layer distance (LLD) in the p-PTMSDPA film significantly decreased after the desilylation reaction.
  Macromolecular Rapid Communications 06/2011; 32(14):1047-51. · 4.60 Impact Factor
• Article: Piezochromic fluorescence in liquid crystalline conjugated polymers.

  Wang-Eun Lee, Chang-Lyoul Lee, Toshikazu Sakaguchi, Michiya Fujiki, Giseop Kwak
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  ABSTRACT: Liquid crystalline diphenylacetylene polymer derivatives showed piezochromic fluorescence via order-to-disorder phase transition.
  Chemical Communications 02/2011; 47(12):3526-8. · 6.17 Impact Factor