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SAXS investigations on chiral liquid crystalline polymers: antiferroelectric and ferrielectric structures?
Author(s) -
Mensinger Hildegard,
Biswas Amit
Publication year - 1992
Publication title -
polymers for advanced technologies
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.61
H-Index - 90
eISSN - 1099-1581
pISSN - 1042-7147
DOI - 10.1002/pat.1992.220030510
Subject(s) - mesogen , small angle x ray scattering , materials science , superstructure , antiferroelectricity , side chain , liquid crystal , phase (matter) , polymer , crystallography , ferroelectricity , chemical physics , scattering , organic chemistry , composite material , liquid crystalline , optics , thermodynamics , chemistry , physics , optoelectronics , dielectric
The structure and phase behavior of liquid crystalline polymers (LCPs) having a common chiral side chain mesogen but different main chain structures have been investigated using small‐angle X‐ray scattering (SAXS). While the low molecular weight chiral side chain mesogen by itself exhibits ferroelectricity, the SAXS data of the side chain LCP with a flexible polyacrylate backbone contains a bilayered superstructure peak that is indicative of antiferroelectric order. The combined LCP with a nonpolar main chain mesogen also has a bilayered superstructure, but has a different structural organization in the proposed antiferroelectric phase compared to the side chain LCP. Further changes in the phase behavior and structural organization occur when a polar group is introduced into the main chain mesogen. A ferrielectric phase has been proposed to explain the observation of a trilayered superstructure in the corresponding SAXS data. The influence of the chemical structure and connectivity on the phase behavior and superstructure formation in the chiral LCPs is discussed.