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Properties of side chain liquid crystal polyesters containing chiral groups in the main chain
Author(s) -
Mehl G. H.,
Valvo F.,
Lacey D.,
Goodby J. W.,
DasGupta D. K.
Publication year - 1996
Publication title -
polymer engineering and science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.503
H-Index - 111
eISSN - 1548-2634
pISSN - 0032-3888
DOI - 10.1002/pen.10693
Subject(s) - materials science , side chain , polyester , liquid crystal , phase (matter) , bilayer , polymer , pyroelectricity , dielectric , chain (unit) , biphenyl , polymer chemistry , mesogen , crystallography , organic chemistry , liquid crystalline , composite material , chemistry , ferroelectricity , membrane , biochemistry , physics , optoelectronics , astronomy
The synthesis and investigation are reported for the phase behavior of a set of three liquid‐crystalline side chain polyesters (SCLCPs), consisting of aromatic diacids and diols bearing cyano biphenyl moieties in the side chain. The materials contain a chiral center in the main chain and show a cholesteric phase indicative of a helical order with a preferred twist. In addition, they exhibit T g 's below room temperature and smectic bilayer phases. Depending on the substitution pattern of the aromatic core, S c* or S A* phases are observed. These polymers were synthesized in a four‐step synthesis, starting from available materials. The dielectric relaxation behavior and the pyroelectric responses of the three SCLCPs tend to conform to their respective structure.