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Synthesis and characterization of liquid crystalline copolyesters containing horizontal and lateral rods in main chain
Author(s) -
Li Chenguang,
Xie Xuming,
Cao Shaokui
Publication year - 2002
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.191
Subject(s) - thermotropic crystal , materials science , liquid crystal , differential scanning calorimetry , rod , crystallinity , polymer , polymerization , gel permeation chromatography , polymer chemistry , chemical engineering , crystallography , liquid crystalline , composite material , chemistry , medicine , physics , optoelectronics , alternative medicine , pathology , engineering , thermodynamics
A series of liquid crystalline copolyesters containing both horizontal and lateral rods in main chain were synthesized through solution polymerization of 2,5‐bis(4‐alkoxy benzoyloxy)hydroquinone, 4,4 ′‐dihydroxy‐α,ω‐diphenoxydecane and 4,4 ′‐dichloroformyl‐α,ω‐diphenoxydecane. These copolyesters were soluble in common organic solvents, showed thermotropic nematic liquid crystallinity that can be easily obtained at room temperature, thereby making them processable at relatively low temperatures in their high‐ordered liquid crystalline states where they are thermally stable. Their thermal transitions can be well adjusted by judiciously controlling the attachment content of lateral rods, and their thermal behaviors were well examined. All synthesized polymers were characterized by gel permeation chromatography (GPC), differential scanning calorimetry (DSC), polarized optical microscopy (POM) and wide angle X‐ray diffraction (WAXD). Copyright © 2002 John Wiley & Sons, Ltd.