PE-HD/EVA共混物的黏度及挤出压力振荡现象  

Study on Viscosity and Extrusion Pressure Oscillation of PE-HD/EVA Blends

作　　者：杨军红[1] 刘跃军[1] 李祥刚[1] 谭辉[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412007

出　　处：《中国塑料》2008年第4期57-61,共5页China Plastics

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：采用恒速型双毛细管流变仪研究高密度聚乙烯(PE-HD)与乙烯-醋酸乙烯共聚物(EVA)共混物的流变现象,着重研究了不同比例 EVA 的加入对 PE-HD 的黏度及压力振荡现象的改善情况。研究发现,在 PE-HD 中添加适量的 EVA 可以降低共混物的黏度,在低剪切速率下,共混物的黏度对 EVA 的用量比较敏感,随着 EVA 用量的增加呈近似线性减小趋势;在 PE-HD 中添加适量的 EVA 可以抑制压力振荡现象,使共混物发生振荡的临界剪切速率升高,振荡的振幅减小。The rheological property for blends of high density polyethylene （PE-HD） and ethylene/vinyl acetate copolymer （EVA） were studied using a double capillary rheometer of constant speed type. The, major attention was paid to the effects of EVA contents on the viscosity and the extrusion pressure oscillation. At low shear rate, the viscosity of the blend was sensitive to EVA contents, and exhibited almost a linearly ciecrease with increasing content of EVA. By blending PE-HD with EVA, the extrusion pressure oscillation can be suppressed; the critical shear rate was increased and the amplitude of pressure oscillation was reduced.

关 键 词：高密度聚乙烯 乙烯-醋酸乙烯共聚物 共混 挤出压力振荡 黏度 

分 类 号：TQ320.663[化学工程—合成树脂塑料工业]