在经典的热力学理论基础上,探讨了磁场对聚合物本体结晶过程的成核与生长的影响,建立了相关结晶动力学理论方程.初步认为,磁场产生的“磁结晶效应”可能是由于晶相与非晶相之间磁化率差异导致了两相之间磁化能的差异,也可能由于聚合物体系在结晶前会形成一种有序相,减小了体系的熵值,进而改变了结晶过程中的体系自由能,影响其成核与晶体生长,乃至整个结晶动力学方程.利用Matlab软件结合PLLA的各结晶参数值,绘制了结晶自由能与各成核临界参数之间的函数图像.结果表明,在低过冷度下,较小的自由能扰动可能导致较大的晶核临界参数变化. Based on the classical theory of thermodynamics, the effect of magnetic field on the nucleation and growth of the polymer bulk is discussed, and the theoretical equation of the related crystallization kinetics is established. It is preliminarily believed that the “magnetic crystallization effect” generated by the magnetic field may be due to Differences in susceptibility between the crystalline phase and the amorphous phase lead to differences in the magnetizations between the two phases. It is also possible that the polymer system forms an ordered phase prior to crystallization, reducing the entropy of the system and thus changing The free energy of the system during the crystallization process affects its nucleation and crystal growth, and even the whole crystallization kinetics equation. By using Matlab software combined with each crystal parameter value of PLLA, a functional image between the free energy of crystal and the critical parameter of each nucleation is drawn The results show that at low undercooling, the smaller perturbation of free energy may lead to the larger critical parameters of nuclei.