东华大学学报（英文版）2025，Vol.42Issue(2)：124-135,12.DOI:10.19884/j.1672-5220.202405016
热处理工艺对热致液晶聚芳酯分子量及热性能的影响
Effect of Heat Treatment on Molecular Mass and Thermal Properties of Thermotropic Liquid Crystal Polyesters
摘要
Abstract
The thermotropic liquid crystal polyester(TLCP)fiber is an increasingly important strategic high-performance fiber.In this paper,the TLCP was prepared by two-step melt polymerization using 4-hydroxybenzoic acid(HBA)and 6-hydroxy-2-naphthoic acid(HNA)as comonomers at a molar ratio of 7∶3.The structure of TLCP was confirmed by the Fourier transform infrared(FTIR)spectrometer and nuclear magnetic resonance(NMR)spectrometer.The thermal and rheological properties of TLCP before and after heat treatment were analyzed systematically by the differential scanning calorimeter(DSC),dynamic mechanical analyzer(DMA)and high-temperature rotational rheometer.The results revealed that the melting temperature,glass transition temperature and melt viscosity of the TLCP increased significantly after heat treatment.It indicates that the crystallization of the TLCP is perfect,and solid-phase condensation occurs during heat treatment,which increases its molecular mass.In conclusion,heat treatment at a temperature below but close to the melting temperature can effectively regulate the structure and properties of the TLCP,and the results of this study can provide a reference for the high strengthening of TLCP fibers.关键词
热致液晶聚芳酯/热处理/黏度/热性能Key words
thermotropic liquid crystal polyester(TLCP)/heat treatment/viscosity/thermal property分类
金属材料引用本文复制引用
董世航,陈宇锋,万海,梁源,黄铄涵,王燕萍,夏于旻..热处理工艺对热致液晶聚芳酯分子量及热性能的影响[J].东华大学学报（英文版）,2025,42(2):124-135,12.基金项目
National Key Research and Development Program of China(No.2021YFB3700105) （No.2021YFB3700105）
