Synthesis and characterization of a novel liquid crystalline star-shaped polymer based on α-CD core via ATRP

Authors

  • Tao He,

    1. College of Chemistry, Xiangtan University, Xiangtan 411105, Hunan Province, People's Republic of China
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  • Tianhui Hu,

    1. College of Chemistry, Xiangtan University, Xiangtan 411105, Hunan Province, People's Republic of China
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  • Xuefei Zhang,

    1. College of Chemistry, Xiangtan University, Xiangtan 411105, Hunan Province, People's Republic of China
    2. Key Laboratory of Environmentally-Friendly Chemistry and Applications of Ministry of Education, Xiangtan 411105, Hunan Province, People's Republic of China
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  • Guanqun Zhong,

    1. College of Chemistry, Xiangtan University, Xiangtan 411105, Hunan Province, People's Republic of China
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  • Hailiang Zhang

    Corresponding author
    1. College of Chemistry, Xiangtan University, Xiangtan 411105, Hunan Province, People's Republic of China
    2. Key Laboratory of Low-Dimensional Materials and Application Technology of Ministry of Eductaion, Xiangtan University, Xiangtan 411105, Hunan Province, People's Republic of China
    • College of Chemistry, Xiangtan University, Xiangtan 411105, Hunan Province, People's Republic of China
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Abstract

Well-defined side-chain liquid crystalline star-shaped polymers were synthesized with a combination of the “core-first” method and atom transfer radical polymerization (ATRP). Firstly, the functionalized macroinitiator based on the α-Cyclodextrins (α-CD) bearing functional bromide groups was synthesized, confirmed by 1H-NMR, MALDI-TOF, and FTIR analysis. Secondly, the side-chain liquid crystalline arms poly[6-(4-methoxy-4-oxy-azobenzene) hexyl methacrylate] (PMMAzo) were prepared by ATRP. The characterization of the star polymers were performed with 1H-NMR, gel permeation chromatography (GPC), differential scanning calorimetry (DSC) and thermal polarized optical microscopy (POM). It was found that the liquid crystalline behavior of the star polymer α-CD-PMMAzon was similar to that of the linear homopolymer. The phase-transition temperatures from the smectic to nematic phase and from the nematic to isotropic phase increased as the molecular weight increased for most of these samples. All star-shaped polymers show photoresponsive isomerization under the irradiation with Ultraviolet light. © 2009 Wiley Periodicals, Inc. J Appl Polym Sci, 2009

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