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Wall slip in the extrusion of linear polyolefins

 

作者: Charles W. Stewart,  

 

期刊: Journal of Rheology  （AIP Available online 1993）
卷期: Volume 37, issue 3  

页码: 499-513

 

ISSN:0148-6055

 

年代: 1993

 

DOI:10.1122/1.550456

 

出版商: The Society of Rheology

 

关键词: Extrusion aid;Fluoroelastomer;Fluoropolymer;Melt fracture;Onset of slip;Polyethylene;Processing aid;Sharkskin;Slip velocity;POLYMERS;SLIP FLOW;SLIP VELOCITY;POLYOLEFINS;EXTRUSION;POLYETHYLENES;DIES;MELTS;SURFACE TENSION;FLUORINE;FRACTURES

 

数据来源: AIP

 

摘要:

A molecular model, based on the concept of the activation rate theory, is developed for slip of a polymer as it flows through a die. The model correctly predicts the dependence of the critical shear stress for the onset of slip and the slip velocity of high molecular weight, linear polyethylene resins on temperature, pressure, wall shear stress, and molecular weight. It also predicts the increased slip which occurs when die surfaces are coated with a fluoropolymer having a low surface tension. It is not applicable at and above the critical shear stress for the onset of gross melt fracture.

 

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