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Novel Amphiphilic Diblock and Triblock Liquid-Crystalline Copolymers with Well-Defined Structures Prepared by Atom Transfer Radical Polymerization

Authors

  • Haifeng Yu,

    1. Chemical Resources Laboratory, Tokyo Institute of Technology, R1-11, 4259 Nagatsuta, Midori-ku, Yokohama 226-8503, Japan
    2. The Core Research for Evolutional Science and Technology (CREST), Japanese Science and Technology Agency (JST), Japan
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  • Atsushi Shishido,

    1. Chemical Resources Laboratory, Tokyo Institute of Technology, R1-11, 4259 Nagatsuta, Midori-ku, Yokohama 226-8503, Japan
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  • Tomiki Ikeda,

    Corresponding author
    1. Chemical Resources Laboratory, Tokyo Institute of Technology, R1-11, 4259 Nagatsuta, Midori-ku, Yokohama 226-8503, Japan
    • Chemical Resources Laboratory, Tokyo Institute of Technology, R1-11, 4259 Nagatsuta, Midori-ku, Yokohama 226-8503, Japan.
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  • Tomokazu Iyoda

    1. Chemical Resources Laboratory, Tokyo Institute of Technology, R1-11, 4259 Nagatsuta, Midori-ku, Yokohama 226-8503, Japan
    2. The Core Research for Evolutional Science and Technology (CREST), Japanese Science and Technology Agency (JST), Japan
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Abstract

Summary: Based on a hydrophilic poly(ethylene oxide) macroinitiator (PEOBr), a novel amphiphilic diblock copolymer PEO-block-poly(11-(4-cyanobiphenyloxy)undecyl) methacrylate) (PEO-b-PMA(11CB)) was prepared by atom transfer radical polymerization (ATRP) using CuCl/1,1,4,7,10,10-hexamethyltriethylenetriamine as a catalyst system. An azobenzene block of poly(11-[4-(4-butylphenylazo)phenoxyl]undecyl methacrylate) was then introduced into the copolymer sequence by a second ATRP to synthesize the corresponding triblock copolymer PEO-b-PMA(11CB)-b-PMA(11Az). Both of the amphiphilic block copolymers had well-defined structures and narrow molecular-weight distributions, and exhibited a smectic liquid-crystalline phase over a wide temperature range.

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The amphiphilic triblock copolymer synthesized here.

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