Morphology and Phase Behavior of the PET/HBA/HQ/TA Copolyesters

Abstract

Abstract: Aseries of etching methods were developed for the morphology observation of liquid crystalline copolyester. Phase behavior of the PET/HBA/HQ/TA copolyester was investigated by SEM after etching. Atwo-phase structure of these copolyesters was found. When PETmolar fraction is lower than₅₀%, HBA/HQ/TA-rich-phase is a continuous phase, while the dispersion particles are PET-rich-phase. When PET molar fraction is equal to or greater than 50%, PET-rich-phase constitutes continuous phase, while HBA/HQ/TA-rich-phase forms dispersion particles which are composed of fibers. Therefore this PET/HBA/HQ/TA copolyester is not a random copolymer but a block one with long PET blocks.

Key words: Liquid crystalline copolyester, Etching, Two-phase structure, Morphology

CLC Number:

O631.1

TrendMD:

LAN Qiang, CHENG Dan, YU Ying, BU Hai-Shan . Morphology and Phase Behavior of the PET/HBA/HQ/TA Copolyesters[J]. Chem. J. Chinese Universities, 2003, 24(9): 1712.

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Morphology and Phase Behavior of the PET/HBA/HQ/TA Copolyesters

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