Kozisek Zdenek, Hikosaka Masamichi, Demo Pavel, Sveshnikov Alexei M
Institute of Physics, Academy of Sciences of the Czech Republic, Cukrovarnicka 10, 162 53 Praha 6, Czech Republic.
J Chem Phys. 2004 Jul 15;121(3):1587-90. doi: 10.1063/1.1763572.
Kinetic equations describing formation of nuclei of a new phase on active centers from supercooled melt taking into account exhaustion of active centers are solved numerically. Basic characteristics of nucleation process (total number of nuclei and nucleation rate) of folded chain crystals of polyethylene at low supercooling are determined and compared with measured data. Our model gives good coincidence with experimental measurements of the total number density of nuclei. Nucleation rate reaches some quasistationary limit at sufficiently long time, which is approximately 20% of the stationary nucleation rate determined by the standard way.
考虑到活性中心的耗尽，对描述过冷熔体中活性中心上新相核形成的动力学方程进行了数值求解。确定了聚乙烯折叠链晶体在低过冷度下成核过程的基本特征（核的总数和成核速率），并与测量数据进行了比较。我们的模型与核总数密度的实验测量结果吻合良好。在足够长的时间内，成核速率达到某个准稳态极限，该极限约为用标准方法确定的稳态成核速率的20%。
