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Browsing by Author "Ting, CH"

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    Photoluminescence and electroluminescence characteristics of new disubstituted polyacetylenes
    (2001-09-01)
    Ting, CH
    ;
    Hsu, CS
    ;
    應用化學系
    ;
    Department of Applied Chemistry
    Three di-substituted acetylenes in the tolane structure, 4-(trans-4-pentylcyclohexyl)-3',4'-difluorotolane (1M), 4-(trans-4-heptylcyclohexyl)-4'-fluorotolane (2M), and 4-(4-pentylphenyl)-4'-fluorotolane (3M), were polymerized in the presence of TaCl5-based catalyst. The weight-average molecular weights Mw of the polymers were high than 4 x 10(5). Photoluminescence (PL) and electroluminescence (EL) of the three polymers made as single-layer device on indium-tin oxide glass (ITO), ITO/polymer/Al, have been comprehensively studied. By changing the structural conditions of polymer, such as introducing the fluorine atom or a long carbon chain to the end group of polymer side chains, the luminescence is clearly enhanced.
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    Synthesis and photoluminescence property of polyacetylenes containing liquid crystalline side groups
    (2001-09-01)
    Ting, CH
    ;
    Hsu, CS
    ;
    應用化學系
    ;
    Department of Applied Chemistry
    A series of new side-chain liquid crystalline (LC) polyacetylenes containing 4-(trans-n-alkyleyclohexanylcarbonyloxy)phenyl 4-alkynyloxybenzoate side groups were synthesized by using [Rh(nbd)Cl](2), WCl6 and MoCl5 as polymerization catalysts. The synthesized polymers were characterized by differential scanning calorimetry, optical microscopy and X-ray diffraction measurements. The monomers showed a nematic phase while all polymers revealed the nematic, smectic A and smectic C phases. X-ray diffraction measurements proved that all the polymers show an interdigitated bilayer structure. The optical properties of the polymers were investigated by UV-vis and photoluminescent spectroscopies. The polymer films emitted green-blue photoluminescence at about 500 nm.
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    Synthesis and thermal and photoluminescence properties of liquid crystalline polyacetylenes containing 4-alkanyloxyphenyl trans-4-alkylcyclohexanoate side groups
    (2002-02-12)
    Ting, CH
    ;
    Chen, JT
    ;
    Hsu, CS
    ;
    應用化學系
    ;
    Department of Applied Chemistry
    Two series of polyacetylenes containing 4-alkanyloxyphenyl trans-4-n-alkylcyclohexanoate were synthesized using [Rh(nbd)Cl](2), MoCl5, and WCl6 as initiators. Polymers 1P-3P, which contain no flexible spacer, show no mesomorphic properties due to the rigid poly(phenylacetylene) backbone, Polymers 4P-9P, which contain three or four methylene units in their spacers, exhibit both SA and S, phases. X-ray diffraction diagrams reveal that the liquid crystalline polyacetylenes display an interdigitated bilayer structure for the smectic phases. Polymers 4P-9P are photoluminescent, and their emission wavelengths are about 500 rim. The photoluminescence intensity increased dramatically when a liquid crystalline polyacetylene was blended with poly(methyl methacrylate).
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