PEFT等温结晶动力学及多重熔融行为  

Isothermal Crystallization Kinetics and Multiple Melting Behavior of PEFT

作　　者：王智军 王静刚[2] 庞永艳[2] 朱锦[2] 郑文革[2] Wang Zhijun;Wang Jinggang;Pang Yongyan;Zhu Jin;Zheng Wenge(Faculty of Material Metallurgical and Chemistry,Jiangxi University of Science and Technology,Ganzhou 341000,China;Ningbo Institute of Materials Technology and Engineering,Chinese Academy of Sciences,Ningbo 315201,China)

机构地区：[1]江西理工大学材料冶金化学学部,江西赣州341000 [2]中国科学院宁波材料技术与工程研究所,浙江宁波315201

出　　处：《工程塑料应用》2022年第7期110-116,127,共8页Engineering Plastics Application

基　　金：宁波市科技创新2025重大专项(2018B10013);浙江省重点研发计划项目(2021C01005)。

摘　　要：为探究共聚单元2,5-呋喃二甲酸(FDCA)对聚对苯二甲酸-2,5-呋喃二甲酸乙二醇共聚酯(PEFT)的等温结晶动力学和多重熔融行为的影响,首先,利用差示扫描量热(DSC)仪研究聚对苯二甲酸乙二醇酯(PET)和PEFT在固定降温和升温速率下的熔融结晶和冷结晶行为。其次,研究PET和PEFT在不同结晶温度下的等温熔融结晶和冷结晶动力学,采用Avrami方程和Arrhenius方程计算相应的动力学参数。最后,研究PET和PEFT熔融结晶后的多重熔融行为,计算平衡熔点。结果表明,FDCA共聚单元破坏了PET分子链的对称性和规整性,降低了PEFT的结晶温度和熔融温度;FDCA共聚单元含量和结晶温度是影响PEFT等温熔融结晶和冷结晶动力学的两大重要因素;PET和PEFT在熔融结晶后的多重熔融行为对结晶温度具有明显的依赖性,且平衡熔点随着共聚酯中FDCA含量的增加而减小。The effect of 2,5-furandicarboxylic acid(FDCA)copolymerization unit on isothermal crystallization kinetics and multiple melting behavior of poly(ethylene terephthalate-co-2,5-furandicarboxylate)copolyesters(PEFT)was studied.First,the melt crystallization and cold crystallization behavior of poly(ethylene terephthalate)(PET)and PEFT were studied at a fixed cooling and heating rate with differential scanning calorimetry(DSC).Second,the melt crystallization and cold crystallization kinetics of PET and PEFT isothermally crystallized at different crystallization temperatures were studied,and the corresponding kinetic parameters were calculated with the Avrami equation and the Arrhenius equation.Finally,the multiple melting behavior of PET and PEFT after melt crystallization was studied,and the equilibrium melting temperature was also calculated.The results show that the FDCA copolymerization unit destroys the symmetry and regularity of PET molecular chains and decreases crystallization temperature and melting temperature of PEFT.The content of FDCA copolymerization unit and crystallization temperature are two important factors influencing the isothermal melt crystallization and cold crystallization kinetics of PEFT.The multiple melting behavior of PET and PEFT after melt crystallization depends closely on crystallization temperature,and the equilibrium melting temperature decreases with the FDCA content increase in PEFT.

关 键 词：聚对苯二甲酸-2 5-呋喃二甲酸乙二醇共聚酯 等温结晶动力学 熔融结晶和冷结晶 多重熔融行为 聚对苯二甲酸乙二醇酯 

分 类 号：TQ323.4[化学工程—合成树脂塑料工业]