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Synthesis and characterization of new ferroelectric liquid‐crystalline cyclic oligosiloxanes containing methyleneoxymethylene spacers
Author(s) -
Sołtysiak Joanna T,
Czupryński Krzysztof,
Drzewiński Witold
Publication year - 2006
Publication title -
polymer international
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.592
H-Index - 105
eISSN - 1097-0126
pISSN - 0959-8103
DOI - 10.1002/pi.1943
Subject(s) - mesogen , differential scanning calorimetry , materials science , biphenyl , side chain , liquid crystal , monomer , carboxylate , ferroelectricity , crystallography , liquid crystalline , polymer chemistry , characterization (materials science) , polarized light microscopy , polymer , organic chemistry , chemistry , nanotechnology , composite material , optics , thermodynamics , physics , optoelectronics , dielectric
The synthesis of side‐chain liquid‐crystalline oligocyclosiloxanes containing methyleneoxymethylene spacers, two different mesogenic cores (including biphenyl phenyl carboxylate or biphenyl fluorophenyl carboxylate groups) and chiral tails is presented. Differential scanning calorimetry, optical polarizing microscopy and X‐ray diffraction measurements reveal liquid‐crystalline properties for all of the synthesized monomers and oligomers. All cyclic oligosiloxanes exhibit enantiotropic smectic A and chiral smectic C phases. The mesogenic properties of the cyclic oligomers and side‐chain liquid‐crystalline precursor are discussed. Copyright © 2005 Society of Chemical Industry