Citation:
WANG Yong, WU Dacheng, LI Ruixia. PROPERTIES AND MICROSTRUCTURE OF AROMATIC LIQUID CRYSTALLINE COPOLYESTERS[J]. Chinese Journal of Polymer Science,
1997, 15(2): 123-128.
PROPERTIES AND MICROSTRUCTURE OF AROMATIC LIQUID CRYSTALLINE COPOLYESTERS
摘要:
The properties and structures of thermotropical liquid crystalline copolyesters basedon p-hydroxybenzoic acid (PHBA), terephthalic acid (TPA) and bisphenol A (BPA) werestudied by DSC, WAXD, hot stage polarized microscopy and NMR. It was found that mostof the copolyesters were soluble in many common organic solvents. The copolyesters hadfow Tm/Tf values and a broad range of liquid crystal phase, making the polymers readilymelt-processable. The effects of annealing at different temperatures on the copolyester containing 33% PHBA were also discussed.It was noted that annealing at ca.200℃ (belowTc-n could lead to the increasing of the crystallinity of the copolyester while the microstructure and sequence structure had not changed.Annealing at ca.280℃ (near Tc-n) could bring a change of crystal and sequence structure and simultaneously made the microdomains be ordered more perfectly.
English
PROPERTIES AND MICROSTRUCTURE OF AROMATIC LIQUID CRYSTALLINE COPOLYESTERS
Abstract:
The properties and structures of thermotropical liquid crystalline copolyesters basedon p-hydroxybenzoic acid (PHBA), terephthalic acid (TPA) and bisphenol A (BPA) werestudied by DSC, WAXD, hot stage polarized microscopy and NMR. It was found that mostof the copolyesters were soluble in many common organic solvents. The copolyesters hadfow Tm/Tf values and a broad range of liquid crystal phase, making the polymers readilymelt-processable. The effects of annealing at different temperatures on the copolyester containing 33% PHBA were also discussed.It was noted that annealing at ca.200℃ (belowTc-n could lead to the increasing of the crystallinity of the copolyester while the microstructure and sequence structure had not changed.Annealing at ca.280℃ (near Tc-n) could bring a change of crystal and sequence structure and simultaneously made the microdomains be ordered more perfectly.
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