2H-NMR of the induced chiral phases of acrylate-metacrylate liquid crystalline copolymers

Evgueni Barmatov, Lucia Calucci, Donata Catalano, Leonardo Chiezzi, Carlo Alberto Veracini, Katalin Fodor-Csorba

Research output: Contribution to journalArticle

Abstract

It is shown that the addition of 2 to 6wt. % of a chiral dopant (CD) to a series of nematic copolymers (Pn) induces blue and cholesteric mesophases. The mesomorphic behaviour of various CD + Pn mixtures is investigated by polarized optical microscopy and the phase transition temperatures are determined by DSC measurements. Deuterium NMR spectra are recorded as a function of temperature within the mesophases and the spectral line shapes characteristic of different local orientational order parameters and orientational ordering processes of molecules in a magnetic field are observed depending on temperature, heating or cooling process, chiral dopant concentration, copolymer composition, and magnetic field strength.

Original languageEnglish
Pages (from-to)181-191
Number of pages11
JournalMolecular crystals and liquid crystals
Volume429
DOIs
Publication statusPublished - Dec 1 2005

Keywords

  • Blue phases
  • Cholestric phases
  • Deuterium NMR
  • Induced chirality
  • Polymeric liquid crystals

ASJC Scopus subject areas

  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics

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