Ion-conductive liquid crystals: Formation of stable smectic semi-bilayers by the introduction of perfluoroalkyl moieties

Koji Hoshino, Kiyoshi Kanie, Toshihiro Ohtake, Tomohiro Mukai, Masahiro Yoshizawa, Seiji Ujiie, Hiroyuki Ohno, Takashi Kato

Research output: Contribution to journalArticlepeer-review

28 Citations (Scopus)

Abstract

Liquid-crystalline compounds 1 and 3 having perfluoroalkyl-terminated mesogens at both ends of poly(ethylene oxide) chains have been prepared. These compounds show smectic A (SA) and C phases over 100°C. The SA-Iso (isotropic) transition temperatures are higher by about 70°C than those of the corresponding alkyl-substituted compounds 2 and 4. The incorporation of lithium triflate into 1 and 3 widens the temperature ranges of the SA phases for the resulting complexes. The complexes of 1 and 3 containing 50 mol-% of lithium triflate exhibit columnar phases. The ionic conductivities of the homotropically aligned complexes based on 1 along the direction perpendicular to the molecular director of the SA phases are higher than those of the corresponding compound of 2. The increase of the ionic conductivities as well as the stabilization of the smectic phases for these perfluoroalkyl-terminated compounds may be due to the formation of more stabilized layered structures through the intermolecular interactions among the perfluoroalkyl moieties.

Original languageEnglish
Pages (from-to)1547-1555
Number of pages9
JournalMacromolecular Chemistry and Physics
Volume203
Issue number10-11
DOIs
Publication statusPublished - 2002 Jul 29
Externally publishedYes

Keywords

  • Ion-conductive polymers
  • Liquid-crystalline polymers
  • Perfluoroalkyl moieties
  • Self-organization
  • Smectic

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Physical and Theoretical Chemistry
  • Polymers and Plastics
  • Organic Chemistry
  • Materials Chemistry

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