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论文类型：期刊论文

发表时间：2007-05-01

发表刊物：EUROPEAN POLYMER JOURNAL

收录刊物：SCIE、EI、Scopus

卷号：43

期号：5

页面范围：1969-1977

ISSN号：0014-3057

关键字：chain extension; copolyesters; liquid crystalline; degradation

摘要：To increase the molecular weights of the synthesized liquid crystalline aromatic/aliphatic copolyesters and to avoid crosslinking, a solution polymerization of the prepolymer and chain extender hexamethylene diisocyanate was adopted. The effects of chain extension on polyester molecular weights, thermal and mechanical properties, and biodegradable behaviors were investigated respectively. The catalysis mechanism and the copolyesters morphological textures were also investigated. The synthesized copolyesters were characterized by means of Fourier transform infrared spectra (FTIR), gel permeation chromatography (GPC), viscosity measurements, differential scanning calorimetry (DSC), X-ray diffraction (XRD),. polarizing light microscopy (PLM), scanning electron microscopy (SEM) and mechanical property measurements. It was found that inherent viscosities and the molecular weights of the copolyesters were remarkably increased under the action of catalyst, leading to a increase in the tensile strength. The degree of relative crystallinity, the melting temperature, and the rate of degradation decreased after chain extension. (C) 2007 Elsevier Ltd. All rights reserved.