On the predictive/fitting capabilities of the advanced differential constitutive equations for branched LDPE melts |
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| Institution: | 1. Institute of Hydrodynamics, Academy of Sciences of the Czech Republic, Pod Patankou 5, 166 12 Prague 6, Czech Republic;2. Polymer Centre, Faculty of Technology, Tomas Bata University in Zlín, TGM 275, 762 72 Zlín, Czech Republic |
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| Abstract: | Predictive/fitting capabilities of the XPP, PTT–XPP and modified Leonov constitutive equations are compared in both steady as well as transient shear and uniaxial elongational flows using two, highly branched LDPE materials (Escorene LD165BW1 and Bralen RB0323). It has been found that even if all three tested models exhibit very good fitting capability for steady uniaxial extensional viscosity curve, their predicting capabilities may differ significantly for shear viscosity as well as first and second normal stress coefficients. |
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