HDPE/EVA共混体系的流变行为研究  

Rheological Behavior of HDPE/EVA Blend

作　　者：刘跃军[1] 李祥刚[1] 黄宇刚[1] 

机构地区：[1]湖南工业大学包装新材料与技术重点实验室,湖南株洲412008

出　　处：《湖南工业大学学报》2008年第3期71-73,77,共4页Journal of Hunan University of Technology

基　　金：国家自然科学基金资助项目(10672197);湖南省自然科学杰出青年基金资助项目(07JJ1001)

摘　　要：用乙烯-醋酸乙烯共聚物(EVA)与高密度聚乙烯(HDPE)通过热机械共混,制得HDPE/EVA共混物,用高压毛细管流变仪对此类共混物的流变行为进行了研究。结果表明,HDPE/EVA共混熔体为假塑性流体;表观粘度随剪切速率和切应力的增大、温度的升高而减小;粘流活化能随剪切速率的增大呈逐渐减小的趋势。对粘度与组分配比间的关系,Taylor模型的预测值与实测值之间相差较大,不宜用来描述HDPE/EVA共混熔体的流变行为,Hashin模型与Heitmiller模型的预测值均与实测值比较接近。HDPE/EVA blend was prepared by thermal mechanical blend method, and the theological behavior of the prepared blend was studied with capillary rheometer. The results show that the blend is a pseudoplastic fluid, the apparent viscosity of the blend decreases with the increase of the shear rate and Shear stress and with the rise of temperature. The viscosity-flow activation energy of the blend tends to decrease with the increase of shear rate and the content of EVA. Aiming at the relationship between the viscosity and the component ratio, the predicted values of Hashin model and Heitmiller model matched the experiment results well, while the error of Taylor model is much bigger.

关 键 词：乙烯-醋酸乙烯共聚物 高密度聚乙烯 共混物 流变行为 

分 类 号：TQ325[化学工程—合成树脂塑料工业]