PA56/66共聚酰胺的非等温结晶动力学研究

半结晶聚合物的结晶动力学对聚合物的结构以及性能具有大的影响,是聚合物加工过程中的关键参数.用差式扫描量热仪(DSC)研究了PA56、PA66及PA56/66共聚酰胺非等温结晶行为,采用Jeziorny法和MO法描述了PA56、PA66及PA56/66共聚酰胺的非等温结晶动力学,用 Kissinger计算了PA56、PA66及PA56/66共聚酰胺的非等温结晶活化能. 研究表明:Jeziorny法可以描述PA56、PA66及PA56/66共聚酰胺的非等温结晶过程的主要结晶部分,但不能描述PA56、PA66、PA56/66共聚酰胺非等温结晶的全部过程. MO法可以很好地描述PA56、PA66及PA56/66共聚酰胺的非等温结晶全部过程. Avrami指数n显示出PA56、PA66及PA56/66共聚酰胺具有更为复杂的成核及晶体成长机理. PA56在分子层面引入到PA66基体中,改变其晶体结构,加快其结晶速率.

Non-isothermal crystallization kinetics of PA56/66 copolyamide

The crystallization kinetics of semi-crystalline polymer has a great influence on the structure and properties of polymer materials, and it is a important parameter in the process of polymer processing. The non-isothermal crystallization behavior of PA56,PA66 and PA56/66copolyamide was studied by differential scanning calorimetry (DSC). Jeziorny and Mo’s method were used to describe the non-isothermal crystallization kinetics of PA56, PA66 and PA56/66 copolyamide. The activation energy of non-isothermal crystallization of PA56, PA66 and PA56/66 copolyamide was calculated by Kissinger’s method. The results show that Jeziorny method can describe the main part of crystallization of PA56, PA66 and PA56/66 copolyamide, but it can not describe the whole process of them. Mo’s method can well describe the whole non-isothermal crystallization process of PA56, PA66 and PA56/66 copolyamide. Avrami index n shows that PA56, PA66 and PA56/66 copolyamide have more complex nucleation and crystal growth mechanism. PA56 is introduced into PA66 matrix at molecular level to change its crystal structure and accelerate its crystallization rate.