用DSC研究了熔融缩聚法制备的PA6/PA66/PA11共聚物的等温结晶行为.用Avrami方程分析了PA6/PA66/PA11的等温结晶动力学,其Avrami指数n值介于2.34～2.88之间,表明PA6/PA66/PA11是以二维盘状生长和三维球晶生长并存的球状晶体,然后计算了相关的结晶动力学参数.最后用Hoffman-Weeks理论计算出了共聚物的平衡熔点.偏光显微镜分析表明11-氨基十一酸的加入,使得共聚尼龙的球晶粒径进一步细化,数目增多.
Isothermal crystallization behavior of PA6/PA66/PA11 coplymer produced by melt copolycondensation was investigated by means of differential scanning calorimeter(DSC).The crystallization kinetics under isothermal conditions was analysized by the Avrami equation.It is shown that the Avrami equation is applicable for isothermal crystallization very well, and the calculated Avrami index n is from 2.34 to 2.88, which demonstrates that the crystallization of PA6/PA66/PAll coplymer is growing with global tridimensional crystals in this situation.The equilibrium melting temperature was obtained from Hoffman-Weeks theory.The results of polarized optical microscopy(POM) show that the size of PA6/PA66/PA11 coplymer crystal ball decreases, while the number increases.
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