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Synthesis and thermal transitional properties of side‐chain liquid crystalline polyacrylates containing para ‐nitroazobenzene as mesogenic groups
Author(s) -
Li Min,
Zhou Enle,
Xu Jiping,
Chen Xinfang
Publication year - 1996
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/(sici)1097-4628(19960620)60:12<2185::aid-app16>3.0.co;2-6
Subject(s) - mesogen , copolymer , antiparallel (mathematics) , side chain , liquid crystal , polymer , materials science , polymer chemistry , phase (matter) , carbon fibers , crystallography , chemistry , organic chemistry , liquid crystalline , composite material , physics , optoelectronics , quantum mechanics , composite number , magnetic field
The synthesis and characterization of side‐chain liquid crystalline (LC) polyacrylates containing para ‐nitroazobenzene (Pn) as mesogenic groups were described. Homopolymers with 3 and 4 carbon atoms in the spacers were non‐LC polymer; for homopolymers with 6 carbon atoms in the spacer, nematic LC behavior was observed. Copolymers with acrylic acid as one componenet exhibited an S Ad phase according to the WAXD results which showed the d / l of 1.4–1.54 for the copolymers with 3,4 and 6 carbon atoms in the spacers. Considering the molecular structure as well as the WAXD results of the copolymers, the possible molecular arrangement in the smectic S Ad phase was proposed, in which the smectic layers were composed of the antiparallel mesogens and the antiparallel arrangement was considered to be enhanced due to the H bond between COOH and NO 2 . The stress‐induced orientational phenomena of Pn in the LC states was also discussed. © 1996 John Wiley & Sons, Inc.