化工学报2011，Vol.62Issue(4)：1150-1156,7.
聚合物流动诱导结晶数值模拟
Numerical simulation of shear-induced crystallization of polymer
摘要
Abstract
A numerical simulation for the isothermal flow-induced crystallization of polymer in a simple shear flow is presented. The effect of flow on crystallization is considered through the simple mathematical relationship between the additional number of nuclei induced by shear and the first normal stress difference. Leonov viscoelastic model and Avrami model are used to describe the normal stress difference and the crystallization kinetics, respectively. The orientation factor and the shear viscosity are also calculated through the evolution of the relative crystallinity. It is found that the short-term shear has a large effect on the crystallization dynamics of polymer. The effect of the intensity of shear flow will approach some limit, namely, the acceleration degree of crystallization tends to level off when the shear rate or shear time is large enough.关键词
流动诱导结晶/结晶动力学/晶体取向/标准化黏度Key words
shear-induced crystallization/ crystallization kinetics/ orientation/ normalized viscosity分类
化学化工引用本文复制引用
王锦燕,陈静波,刘春太,申长雨..聚合物流动诱导结晶数值模拟[J].化工学报,2011,62(4):1150-1156,7.基金项目
国家自然科学基金项目(10772164) （10772164）
河南省创新型科技人才队伍建设工程. （）
