聚对苯二甲酸甲二酯 (PMT)是一种新型芳香族聚酯 ,本文以DSC差示扫描量热计对PMT的等温结晶动力学进行了研究 ,用Avrami方程对实验数据进行了分析 ,结果发现 :PMT的Avrami指数n在 2 4～ 2 6之间 ,为非整数且接近于 3,说明PMT结晶时倾向于异相成核 ;在实验温度范围内 ,随着等温结晶温度Tc的升高 ,PMT的结晶速率常数K减小 ,半结晶时间t1/ 2 增加。PMT的熔点与聚对苯二甲酸乙二酯 (PET)接近 ,但高于聚对苯二甲酸丙二酯 (PTT)和聚对苯二甲酸丁二酯 (PBT) ,与结构分析得到的结论一致 Poly (ethylene terephthalate) (PMT) is a new type of aromatic polyester. In this paper, the isothermal crystallization kinetics of PMT was studied by DSC differential scanning calorimeter. The experimental data were analyzed by Avrami equation. The results showed that the Avrami index n of PMT ranged from 24 to 26, which was non-integer and close to 3, indicating that PMT tended to nucleate heterogeneous. In the experimental temperature range, as the isothermal crystallization temperature Tc High, the crystallization rate constant K of PMT decreases, and the half crystallization time t1 / 2 increases. The melting point of PMT is close to that of polyethylene terephthalate (PET) but higher than that of polytrimethylene terephthalate (PTT) and polybutylene terephthalate (PBT), and the conclusions obtained from structural analysis Consistent