中国塑料2025，Vol.39Issue(11)：13-19,7.DOI:10.19491/j.issn.1001-9278.2025.11.003
基于毛细管挤出的PE-UHMW/PE-HD共混物不稳定流动行为分析
Analysis of unstable flow behavior in PE-UHMW/PE-HD blends during capillary extrusion
徐成龙 1王玉 1李果 1谢林生 1马玉录1
作者信息
- 1. 华东理工大学机械与动力工程学院,上海 200237
- 折叠
摘要
Abstract
This study investigated the unstable flow behavior of ultra-high molecular weight polyethylene(PE-UHMW)/high-density polyethylene(PE-HD)blends during capillary extrusion.The surface morphology of extrudates,including pure PE-UHMW,pure PE-HD,and their blends,was analyzed to characterize flow instabilities at various extrusion tem-peratures.Key phenomena examined include the critical shear rate for the onset of oscillatory distortion and melt frac-ture,as well as pressure oscillations and wall slip beyond this critical rate.The results indicated that the extrusion mor-phology evolved through a sequence of shark skin,oscillatory distortion,and global melt fracture.At an extrusion tem-perature of 260℃,severe pressure oscillations occurred at a shear rate of 116 s-1,accompanied by a dynamic stick-slip transition at the melt-wall interface that induces oscillatory distortion and wall slip.Furthermore,increasing the extru-sion temperature delayed the onset of unstable flow,expanding the shear rate range for oscillatory distortion from 116～522 s-1 to 152～686 s-1.关键词
超高分子量聚乙烯/毛细管挤出/流变特性/不稳定流动/熔体破裂Key words
ultra-high molecular weight polyethylene/capillary extrusion/rheological property/unstable flow分类
化学化工引用本文复制引用
徐成龙,王玉,李果,谢林生,马玉录..基于毛细管挤出的PE-UHMW/PE-HD共混物不稳定流动行为分析[J].中国塑料,2025,39(11):13-19,7.
