微孔发泡过程中脉动剪切对聚合物/超临界 CO2均相体系形成的影响

提出一种聚合物／超临界CO2均相体系快速形成的新方法——将振动力场引人到发泡过程，在简单剪切的基础上垂直叠加一个脉动剪切场，考察了该方法对均相体系形成的影响。实验材料用聚苯乙烯(PS)，用自行设计的电磁动态发泡模拟机，了不同剪切速率、振动力场及混合时间对聚合物／超临界CO2均相体系形成的影响。结果表明，随着剪切速率的增加，聚合物和气体的混合程度明显增强；而振动力场的引入进一步增强了剪切混合的效果，使聚合物／超临界CO2均相体系能够在较短的时间内形成。

Effect of Oscillatory Shear on Formation of Polymer/Supercritical CO2 Solution in Microcellular Plastic Processing

A novel method by introducing a vibration shear force field vertically to the simple shear was proposed, and the effect of this method on the formation of polymer/supercritical CO 2 solution was studied. Pure PS and a self-made electromagnetical dynamic foaming stimulant was used to investigate the effects of different shear rate, oscillatory shear and mixing time on the formation of polymer/supercritical CO 2 solution. The results showed with the increase of shear rate the degree of mixing was increased greatly, and there was a further increase of mixing degree when oscillatory shear was introduced, resulting a cell structure of larger cell density and more uniform cell distribution.