采用Monte Carlo方法模拟了聚对苯二甲酸乙二酯(PET)在不同成核方式下的非等温结晶过程。发现在预先成核方式下,用Ozawa方程处理实验数据获得的Avrami指数n与理论值3一致。在散现成核方式下,当晶核数目随时间线性增加到一定值不再变化时,获得的Avrami指数n介于理论值3和4之间,表明在散现成核条件下,晶核数目随时间变化增长到一定数目后,成核方式开始由散现成核向预先成核转变。 The non-isothermal crystallization process of polyethylene terephthalate (PET) under different nucleation modes was simulated by Monte Carlo method. It is found that the Avrami index n obtained from the experimental data processing by the Ozawa equation is consistent with the theoretical value 3 under the pre-nucleation method. In the nucleation mode, when the number of nuclei increases linearly with time to a certain value does not change, the Avrami index n is between the theoretical value of 3 and 4, indicating that under the nucleation conditions, the number of nuclei After the time change increases to a certain number, the nucleation mode begins to change from the nucleation to the pre-nucleation.