Photocrosslinkable liquid-crystalline block copolymers with coumarin units synthesized with atom transfer radical polymerization

Yanqing Tian, Xiangxing Kong, Yu Nagase, Tomokazu Iyoda

    Research output: Contribution to journalArticlepeer-review

    41 Scopus citations

    Abstract

    A new class of liquid-crystalline (LC) homopolymers of poly{11-[4-(3-ethoxycarbonyl-coumarin-7-oxy)-carbonylphenyloxy] -undecyl methacrylate} containing a coumarin moiety as a photocrosslinkable unit with various polymerization degrees and their LC-coil diblock and LC-coil-LC triblock copolymers with polystyrene as the coil segment was synthesized with the atom transfer radical polymerization method. All the homopolymers and block copolymers synthesized here exhibited narrow polydispersities, indicating well-controlled living polymerization. Differential scanning calorimetry, polarized optical microscopy, and wide-angle X-ray diffraction confirmed that all the homopolymers and block copolymers exhibit a monolayer smectic A phase. Coumarin moieties in the polymers can be photodimerized under λ > 300 nm light irradiation to yield crosslinked network structures, which improve the thermal stability of a polymer nanostructure because of microphase separation.

    Original languageEnglish (US)
    Pages (from-to)2197-2206
    Number of pages10
    JournalJournal of Polymer Science, Part A: Polymer Chemistry
    Volume41
    Issue number14
    DOIs
    StatePublished - Jul 6 2003

    Keywords

    • Atom transfer radical polymerization (ATRP)
    • Block copolymers
    • Coumarin
    • Liquid crystal
    • Phase separation
    • Photocrosslinking
    • Synthesis

    ASJC Scopus subject areas

    • Polymers and Plastics
    • Organic Chemistry
    • Materials Chemistry

    Fingerprint

    Dive into the research topics of 'Photocrosslinkable liquid-crystalline block copolymers with coumarin units synthesized with atom transfer radical polymerization'. Together they form a unique fingerprint.

    Cite this