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

40 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

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