Experimental correlation between mechanical non-linearity in LAOS flow and capillary flow instabilities for linear and branched commercial polyethylenes

被引：25

作者：

Filipe, Susana ^{[1
]}

Vittorias, Iakovos ^{[1
,2
]}

Wilhelm, Manfred ^{[1
]}

机构：

[1] Max Planck Inst Polymer Res, D-55021 Mainz, Germany

[2] Univ Karlsruhe, Inst Tech Chem & Polmerchem, D-76131 Karlsruhe, Germany

来源：

MACROMOLECULAR MATERIALS AND ENGINEERING | 2008年 / 293卷 / 01期

关键词：

capillary flow; flow instabilities; Fourier-transform rheology; large amplitude oscillatory shear; polyethylene; sharkskin; stick-slip;

D O I：

10.1002/mame.200700194

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

An experimental correlation between the non-linear behaviour of commercial polyethylene melts in LAOS flow, and the pressure fluctuations associated with melt flow instabilities developed in capillary rheometry are presented. Polyethylene melts with enhanced non-linear behaviour under LAOS conditions present larger pressure fluctuations during capillary extrusion, and consequently, larger surface distortions on the extrudate. The combination of both methods can be a tool to predict the development of melt flow instabilities in the extrusion process of polyethylene melts, and can elucidate their correlation with material structural properties ((M) over bar (W), MWD and topology).

引用

页码：57 / 65

页数：9

共 36 条

[1] Temperature and branching dependence of surface extrusion instabilities in metallocene catalysed polyethylene [J].