Dielectric investigations of a chiral monomer and side chain polymer

F. Gouda, A. A. Kutub, K. Fodor-Csorba, G. Galli, E. Chiellini, L. Komitov, J. P.F. Lagerwall, S. T. Lagerwall

Research output: Contribution to journalConference article

Abstract

The dynamics of different collective and non-collective modes in a chiral liquid crystalline monomer and its side-chain polymer have been studied by dielectric spectroscopy. The monomer system enabled us to study the temperature dependence of the dielectric permittivity when crossing the transition from the SmA* phase directly to the crystal phase. Although the polymer system has a SmA* to SmC* transition, we found that the temperature dependence of the dielectric permittivity is radically different from the normally observed behaviour in these phases. The contributions from the soft and Goldstone modes, respectively, are extremely low, a result which is related to the very low value of the spontaneous polarization of the material. At lower temperatures in the SmC* phase, a very weak dielectric absorption located around 50 kHz is observed and discussed in terms of the liberational motion of side chains around the polymer main chain.

Original languageEnglish
Pages (from-to)603/169-611/177
JournalMolecular Crystals and Liquid Crystals Science and Technology, Section A: Molecular Crystals and Liquid Crystals
Volume352
Publication statusPublished - Jan 1 2001
Event5th European Conference on Liquid Crystals (ECLC 99) - Crete, Greece
Duration: Apr 25 1999Apr 30 1999

Keywords

  • Dielectric spectroscopy
  • Goldstone mode
  • Liquid crystal
  • Monomer
  • Polymer
  • Soft mode

ASJC Scopus subject areas

  • Condensed Matter Physics

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  • Cite this

    Gouda, F., Kutub, A. A., Fodor-Csorba, K., Galli, G., Chiellini, E., Komitov, L., Lagerwall, J. P. F., & Lagerwall, S. T. (2001). Dielectric investigations of a chiral monomer and side chain polymer. Molecular Crystals and Liquid Crystals Science and Technology, Section A: Molecular Crystals and Liquid Crystals, 352, 603/169-611/177.