Modelling elongational and shear rheology of two LDPE melts |
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| Authors: | Víctor Hugo Rolón-Garrido Radek Pivokonsky Petr Filip Martin Zatloukal Manfred H Wagner |
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| Institution: | (1) Chair of Polymer Engineering/Polymer Physics, Berlin Institute of Technology (TU Berlin), Fasanenstrasse 90, 10623 Berlin, Germany;(2) Institute of Hydrodynamics, Academy of Sciences of the Czech Republic, Pod Patankou 5, 16612 Prague 6, Czech Republic;(3) Polymer Centre, Faculty of Technology, Tomas Bata University in Zlin, TGM 275, Zlin, 76272, Czech Republic |
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| Abstract: | Experimental data of two low-density polyethylene (LDPE) melts at 200°C for both shear flow (transient and steady shear viscosity
as well as transient and steady first normal stress coefficient) and elongational flow (transient and steady-state elongational
viscosity) as published by Pivokonsky et al. (J Non-Newtonian Fluid Mech 135:58–67, 2006) were analysed using the molecular stress function model for broadly distributed, randomly branched molecular structures.
For quantitative modelling of melt rheology in both types of flow and in a very wide range of deformation rates, only three
nonlinear viscoelastic material parameters are needed: Whilst the rotational parameter, a
2, and the structural parameter, β, are found to be equal for the two melts considered, the melts differ in the parameter  describing maximum stretch of the polymer chains. |
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| Keywords: | Rheology MSF model Shear flow Elongational flow Strain hardening Low-density polyethylene Polymer melts |
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