PROPERTIES AND MICROSTRUCTURE OF AROMATIC LIQUID CRYSTALLINE COPOLYESTERS

WANG Yong; WU Dacheng; LI Ruixia

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PROPERTIES AND MICROSTRUCTURE OF AROMATIC LIQUID CRYSTALLINE COPOLYESTERS

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- PROPERTIES AND MICROSTRUCTURE OF AROMATIC LIQUID CRYSTALLINE COPOLYESTERS
- Vol. 15, Issue 2, Pages: 123-128(1997)
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- Published：20 June 1997
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WANG Yong, WU Dacheng, LI Ruixia. PROPERTIES AND MICROSTRUCTURE OF AROMATIC LIQUID CRYSTALLINE COPOLYESTERS[J]. 1997, 15(2): 123-128.
DOI：

WANG Yong, WU Dacheng, LI Ruixia. PROPERTIES AND MICROSTRUCTURE OF AROMATIC LIQUID CRYSTALLINE COPOLYESTERS[J]. 1997, 15(2): 123-128. DOI：

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.

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

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