Extensional viscosity  for polymer melts  measured in the filament  stretching rheometer

Anders Bach; Henrik K. Rasmussen; Ole Hassager

doi:10.1122/1.1545072

Extensional viscosity for polymer melts measured in the filament stretching rheometer

Anders Bach, Henrik K. Rasmussen, Ole Hassager

Technical University of Denmark

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Abstract

A new filament stretching rheometer has been constructed to measure the elongational viscosity of polymer melts at high temperatures. Two polymer melts, a LDPE and a LLDPE, were investigated with this rheometer. A constant elongational rate has been obtained by an iterative application of the Orr-Sridhar method for specification of the end-plate movement. Agreement has been found with linear viscoelastic measurements performed in shear. Hencky strains up to about 6 have been reached. Steady values of the viscosity have been sustained in some cases for about two Hencky strain units. (C) 2003 The Society of Rheology.

Original language	English
Journal	Journal of Rheology
Volume	47
Issue number	2
Pages (from-to)	429-441
ISSN	0148-6055
DOIs	https://doi.org/10.1122/1.1545072
Publication status	Published - 2003

Bibliographical note

Copyright (2003) American Institute of Physics. This article may be downloaded for personal use only. Any other use requires prior permission of the author and the American Institute of Physics.

Keywords

RELAXATION
FLOW
FLUIDS
BEHAVIOR
ELASTIC DECOHESION

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Cite this

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abstract = "A new filament stretching rheometer has been constructed to measure the elongational viscosity of polymer melts at high temperatures. Two polymer melts, a LDPE and a LLDPE, were investigated with this rheometer. A constant elongational rate has been obtained by an iterative application of the Orr-Sridhar method for specification of the end-plate movement. Agreement has been found with linear viscoelastic measurements performed in shear. Hencky strains up to about 6 have been reached. Steady values of the viscosity have been sustained in some cases for about two Hencky strain units. (C) 2003 The Society of Rheology.",

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AB - A new filament stretching rheometer has been constructed to measure the elongational viscosity of polymer melts at high temperatures. Two polymer melts, a LDPE and a LLDPE, were investigated with this rheometer. A constant elongational rate has been obtained by an iterative application of the Orr-Sridhar method for specification of the end-plate movement. Agreement has been found with linear viscoelastic measurements performed in shear. Hencky strains up to about 6 have been reached. Steady values of the viscosity have been sustained in some cases for about two Hencky strain units. (C) 2003 The Society of Rheology.

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KW - ELASTIC DECOHESION

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