DSC法研究高粘度超有光聚酯切片的等温结晶

摘要

The crystallization behavior of PET with different intrinsic viscosity was investigated using differential scanning calorimetry(DSC).The results show that the cold crystallization peaks(T c) increased and the melting crystallization peaks(T mc) decreased with the intrinsic viscosity increasing.It also shows that Avrami equation was satisfying in describing the isothermal crystallization kinetics of polyesters.Half-time crystallization t 1 /2 increased with the intrinsic viscosity increasing in the same crystallization temperature.These illustrated PET crystallization speed decreased with the intrinsic viscotisy increasing.%采用差示扫描量热法（DSC）对自制不同特性粘数的超有光聚酯切片进行结晶行为研究。分析结果表明：特性粘数增加,冷结晶温度Tc升高,熔融结晶温度Tmc降低,即结晶变慢;等温结晶行为较好地符合了Avrami方程。在同样的结晶温度下,特性粘数升高,半结晶周期t1/2增加,结晶变慢;相同时间内随着聚酯样品特性粘数的升高,结晶速率变慢。