Determination of elongational viscosity of polymer melts by RME and Rheotens experiments

被引：41

作者：

Wagner, MH ^{[1
]}

Bastian, H

Bernnat, A

Kurzbeck, S

Chai, CK

机构：

[1] TU Berlin, Inst Werkstoffwissenschaften & Technol, Berlin, Germany

[2] Univ Stuttgart, Inst Kunststofftechnol, D-7000 Stuttgart, Germany

[3] INA Werk Schaeffler OHG, Herzogenaurach, Germany

[4] BP Amoco Chem, Lavera, France

来源：

RHEOLOGICA ACTA | 2002年 / 41卷 / 04期

关键词：

polymer melts; elongational viscosity; RME; rheotens; Molecular Stress Function theory; similarity model;

D O I：

10.1007/s00397-002-0228-0

中图分类号：

O3 [力学];

学科分类号：

08 ; 0801 ;

摘要：

Several linear (LLDPE, HDPE. PS) and long-chain-branched (LDPE, PP) polymer melts were investigated by an elongational rheometer (RME Rheometrics) and by Rheotens (Gottfert). The Molecular Stress Function (MSF) theory is briefly, reviewed and used to extrapolate the steady-state elongational viscosity. To evaluate Rheotens experiments, a new process model is introduced which assumes that the elongational viscosity in the Rheotens test is a function of the draw ratio only. The apparent elongational viscosities extracted from Rheotens curves are found to lie in between the steady-state elongational viscosity and three times the shear viscosity.

引用

页码：316 / 325

页数：10

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