微孔发泡过程中脉动剪切对聚合物/超临界CO_2均相体系形成的影响  

Effect of Oscillatory Shear on Formation of Polymer/Supercritical CO_2 Solution in Microcellular Plastic Processing

作　　者：高长云 周南桥 何丹超 

机构地区：[1]华南理工大学聚合物成型加工工程教育部重点实验室聚合物新型成型装备国家工程研究中心,广东广州510640

出　　处：《塑料工业》2004年第12期25-26,45,共3页China Plastics Industry

基　　金：育部科学技术研究重点项目 (教育司 [0 1] 2 2 4号 ;0 113 8);高等学校博士学科点专项科研基金 ( 2 0 0 2 0 5 610 0 2 )

摘　　要：提出一种聚合物 /超临界CO2 均相体系快速形成的新方法———将振动力场引入到发泡过程 ,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CO2A 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.

关 键 词：脉动剪切场 聚合物/超临界CO2均相体系 微孔发泡 

分 类 号：TQ328.06[化学工程—合成树脂塑料工业]