Dong-Cheul Han

Kyungpook National University, Daikyū, Daegu, South Korea

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Publications (2)4.61 Total impact

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    ABSTRACT: An acetylene–acrylate polymer hybrid film with enhanced emission, chemical resistance, and photooxidative stability was successfully prepared by the photopolymerization of acrylates in situ in poly[1-phenyl-2-(p-trimethylsilyl)phenylacetylene] (PTMSDPA) film. An acrylate mixture of methyl acrylate (MA) and trimethylol propanetriacrylate (TMPTA) easily diffused into PTMSDPA film, and simultaneously, the emission of the PTMSDPA film significantly increased. Subsequently, when the acrylate-deposited PTMSDPA film was irradiated by UV light at the appropriate irradiation power, the acrylate monomers were readily polymerized in situ in PTMSDPA film. The hybrid film still retained enhanced emission after the photopolymerization. Moreover, the hybrid film hardly dissolved in toluene even after immersing for several minutes, whereas the PTMSDPA film immediately dissolved in toluene. The hybrid film also showed photooxidative stability in air, as compared to the PTMSDPA film, due to the oxygen-blocking effect of the acrylate components. Photomasked UV irradiation of the acrylate-deposited PTMSDPA film led to a highly resolved, fluorescent image pattern on the hybrid film.
    Macromolecules 11/2011; 44(23). · 5.93 Impact Factor
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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. · 4.61 Impact Factor