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Synthesis and thermotropic liquid crystalline behaviour of novel poly(aryl ether ketone)s with a lateral methoxy group
Author(s) -
Zhang Shanju,
Fu Luxiang,
Liu Jingjiang,
Yang Decai,
Gao Zihong,
Jia Mingjun,
Zheng Yubin,
Wu Zhongwen
Publication year - 2000
Publication title -
macromolecular chemistry and physics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.57
H-Index - 112
eISSN - 1521-3935
pISSN - 1022-1352
DOI - 10.1002/(sici)1521-3935(20000301)201:6<649::aid-macp649>3.0.co;2-i
Subject(s) - thermotropic crystal , ether , polymer chemistry , differential scanning calorimetry , copolymer , liquid crystal , aryl , sulfolane , ketone , potassium carbonate , chemistry , polarized light microscopy , materials science , solvent , organic chemistry , polymer , liquid crystalline , alkyl , physics , optoelectronics , optics , thermodynamics
Novel poly(aryl ether ketone)s containing a lateral methoxy group were synthesized by nucleophilic substitution reactions of 4,4′‐biphenol and methoxyhydroquinone with 1,4‐bis(4‐fluorobenzoyl)benzene in a sulfolane solvent in the presence of anhydrous potassium carbonate. Their thermotropic liquid crystalline properties were characterized by a variety of experimental techniques, e. g. differential scanning calorimetry (DSC), polarized light microscopy and temperature‐dependent FTIR. Thermotropic liquid crystalline behaviour was observed in the copolymers containing 30–80 mol‐% mexthoxyhydroquinone. Both melting ( T m ) and isotropization ( T i ) transitions appeared in the DSC curves. The polarized light microscopy study of the liquid crystalline copolymers suggested their ordered smectic structures. As expected, the copolymers had lower melting transitions than the biphenol‐based homopoly(aryl ether ketone)s because of the copolymerization effect of the crystal‐disrupting monomer methoxyhydroquinone.