CHDA改性PBT的非等温结晶动力学研究  

Non-isothermal crystallization kinetics of CHDA modified PBT

作　　者：张建 李晶 ZHANG Jian;LI Jing(Research Institute of SINOPEC Yizheng Chemical Fiber Co.,Ltd.,Yizheng 211900)

机构地区：[1]中国石化仪征化纤有限责任公司研究院,江苏仪征211900

出　　处：《合成纤维工业》2024年第3期56-59,共4页China Synthetic Fiber Industry

摘　　要：以精对苯二甲酸、1,4-丁二醇和1,4-环己烷二甲酸(CHDA)为原料,通过直接酯化法制备CHDA改性聚对苯二甲酸丁二醇酯(PBT)共聚酯,采用差示扫描量热法对CHDA改性PBT共聚酯的结晶性能进行了研究,并采用Jeziorny方法分析了CHDA改性PBT共聚酯的非等温结晶动力学。结果表明:随着CHDA质量分数由0提高至20%,CHDA改性PBT共聚酯的非等温结晶活化能由180.389 kJ/mol降至112.829 kJ/mol,降低幅度达37.45%;随着降温速率(∅)的增大,CHDA改性PBT共聚酯的起始结晶温度、结晶温度降低,半结晶时间减少;在相同∅下,随着CHDA含量的增加,CHDA改性PBT共聚酯的非等温结晶速率变慢,结晶能力降低,CHDA的加入不利于PBT的结晶。1,4-cyclohexanedicarboxylic acid(CHDA)-modified polybutylene terephthalate(PBT)copolyester was prepared by direct esterification using purified terephthalic acid,1,4-butanediol and 1,4-cyclohexanedicarboxylic acid(CHDA)as raw materials.The crystallization properties of the CHDA-modified PBT copolyester were studied by differential scanning calorimetry.The non-isothermal crystallization kinetics of the CHDA-modified PBT was analyzed by Jeziorny method.The results showed that the non-isothermal crystallization activation energy of the CHDA modified PBT copolyester decreased from 180.389 kJ/mol to 112.829 kJ/mol with a reduction of 37.45%as the mass fraction of CHDA increased from 0 to 20%;the initial crystallization temperature and crystallization temperature of the CHDA modified PBT copolyester decreased and the semi crystallization time decreased as the cooling rate(∅)increased;and the non-isothermal crystallization rate of the CHDA modified PBT copolyester slowed down and the crystallization capacity decreased with the increase of CHDA content at the same∅,indicating that the addition of CHDA was not conducive to the crystallization of PBT.

关 键 词：聚对苯二甲酸丁二醇酯 1 4 环己烷二甲酸 改性 非等温结晶动力学 

分 类 号：TQ340.13[化学工程—化纤工业]