用差示扫描量热法（DSC）研究了聚羟基丁酸酯（PHB）的等温与非等温结晶动力学。采用Avrami方程分析了等温结晶动力学,Avrami指数n≈2,表明PHB以异相成核的二维平面晶体方式生长,等温结晶活化能为82.4 kJ/min。采用Jeziorny法和莫志深法分析了PHB的非等温结晶动力学,Avrami指数n≈3,表明PHB非等温结晶过程以异相成核的三维球晶方式生长。
The crystallization kinetics during the isothermal crystalization and nonisothermal crystallization of poly （3-hydroxybutyrate） （PHB） were investigated by means of differential scanning calorimetry（DSC）. The Avrami analysis was performed to obtain the kinetics parameters. The value of Avrami index n, is about D, indicating a twodimensional （2D） growth and heterogeneous nucleation in the process of isothermal crystallization. The activation energy for isothermal crystallization is 82.4 kJ/min, respectively. In the process of nonisothermal crystallization of PHB, the value of Avrami index n, is about 3, which demonstrates a three-dimensional spherulitic growth on heterogeneous nucleation.
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