Rheotens-mastercurves and elongational viscosity of polymer melts |
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Authors: | Prof Dr-Ing Manfred H Wagner Bertrand Collignon Jérôme Verbeke |
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Institution: | (1) Institut für Kunststofftechnologie, Universität Stuttgart, Böblingstraße 70, 70199 Stuttgart, Germany;(2) Unité de Méchanique Appliquée, Université Catholique de Louvain, 1348 Louvain-La-Neuve, Belgium |
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Abstract: | In a Rheotens experiment, the tensile force needed for elongation of an extruded filament is measured as a function of the draw ratio. For thermo-rheologically simple polymer melts, the existence of Rheotens-mastercurves was proved by Wagner, Schulze, and Göttfert (1995). Rheotens-mastercurves are invariant with respect to changes in melt temperature and changes in the average molar mass. By use of purely viscous models, we convert Rheotens-mastercurves of a branched and a linear polyethylene melt to elongational viscosity as a function of strain rate. The resulting elongational viscosity from constant force extension experiments is found to be in general agreement with what is expected as steady-state viscosity of polyethylene melts measured in either constant strain-rate or constant stress mode.Dedicated to Prof. Dr. J. Meissner on the occasion of his retirement from the chair of Polymer Physics at the Eidgenössische Technische Hochschule (ETH) Zürich, Switzerland |
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Keywords: | Polymer melts melt spinning Rheotens mastercurve elongational viscosity |
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