原位增容PA6/PE-HD共混物的非等温结晶动力学研究

Research on Non-isothermal Crystallization Kinetics of In-situ Compatibilized PA6/PE-HD Blends

利用差示扫描量热仪研究了原位增容的聚酰胺6/高密度聚乙烯(PA6/PE-HD)共混物的非等温结晶过程,用经Jeziorny修正的Avrami方程和Mo法对其非等温结晶动力学进行了研究,计算并得到非等温结晶动力学参数。结果表明,该方程和方法适合于处理纯PA和PA6/PE-HD共混物的非等温结晶过程;在PA6/PE-HD共混物非等温结晶过程中,在其初期结晶阶段可能同时包含了均相成核和异相成核,在二次结晶阶段结晶生长可能是一维生长,并且PE-HD的加入,起到异相成核的作用,促进了晶核的生长。此外,还利用Vyazovkin的方法求出PA6/PE-HD共混物结晶活化能与温度之间的关系。

The non-isothermal crystallization kinetics of in-situ compatibilized PA6/PE-HD blends was studied by means of differential scanning calorimetry（DSC）. Its non isothermal crystallization data was analyzed using Jeziorny modified Avrami equation and Mo method. It showed that the above equation and method could well describe the nonisothermal crystallization of PA6 and PA6/ PE-HD blends. At primary crystallization stage, there existed both heterogeneous and homogeneous nucleations. In the secondary crystallization stage, the growth was one-dimensional mode. The addition of PE-HD played a role of heterogeneous nucleation, which promoted the growth of the nuclei. Additionally, the relationship between the activation energy of nonisothermal crystallization of PA6/PE-HD blends and temperature was obtained from Vyazovkin method.