Supramolecular hydrogen-bonded liquid-crystalline polymer complexes. Design of side-chain polymers and a host-guest system by noncovalent interaction

Takashi Kato*, Norifumi Hirota, Akira Fujishima, Jean Frechet

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

95 Scopus citations

Abstract

Supramolecular liquid-crystalline polymeric complexes based on a backbone that contains vinyl pyridine units and azobenzene or biphenyl derivatives that posses alky chains terminated by carboxylic acid have been obtained by the formation of intermodular hydrogen bonds between the carboxylic acid and the pyridyl moieties. The polymeric complexes behave as side-chain liquid-crystalline polymers and exhibit smectic phases. A new type of H-bonded host-guest liquid-crystalline system is also reported. The liquid-crystalline host copolymers contain both mesogenic acrylate and 4-vinylpyridine units. The guest molecule is an azobenzene that has a carboxylic acid moiety at one of its extremities. The H-bonded polymeric host-guest complexes exhibit nematic phases. Sequential UV and visible light irradiation of the polymeric complex causes reversible photochemically induced phase transitions. The isothermal nematic-isotropic and isotropic-nematic transitions result from the trans-cis and cis-trans photoisomerization of the guest azobenzene in the host-guest system.

Original languageEnglish (US)
Pages (from-to)57-62
Number of pages6
JournalJournal of Polymer Science, Part A: Polymer Chemistry
Volume34
Issue number1
DOIs
StatePublished - Jan 15 1996

Keywords

  • Azobenzene
  • Host-guest system
  • Hydrogen bonding
  • Liquid crystal
  • Liquid-crystalline polymer
  • Self-assembly
  • Supramolecule

ASJC Scopus subject areas

  • Polymers and Plastics
  • Organic Chemistry
  • Materials Chemistry

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