本文在预先成核条件下用Monte Carlo方法模拟了53．5℃时PEG纤维的结晶动力学过程。在模拟过程中发现,当纤维的半径达到36μm后,结晶体的生长方式发生转变,表现在Avrami图形上就是在结晶的初期出现了一个不同于二次结晶的转折点。用Avrami方程对模拟实验结果进行了分析讨论,结果表明这个转折点是结晶体在生长过程中由三维生长模式向一维生长模式转变的表现。 In this paper, the Monte Carlo method was used to simulate the crystallization kinetics of PEG fibers at 53.5 ℃ under the pre-nucleation conditions. During the simulation, it was found that when the radius of the fiber reaches 36μm, the crystal growth changes. The Avrami pattern shows that there is a turning point different from the secondary crystallization in the early stage of crystallization. The Avrami equation is used to analyze and discuss the simulation results. The results show that this turning point is the manifestation of the transition from three-dimensional growth mode to one-dimensional growth mode.