A new look at extensional rheology of low-density polyethylene

Qian Huang, Marc Mangnus, Nicolas J. Alvarez, Rudy Koopmans, Ole Hassager

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Abstract

The nonlinear rheology of three selected commercial low-density polyethylenes (LDPE) is measured in uniaxial extensional flow. The measurements are performed using three different devices including an extensional viscosity fixture (EVF), a homemade filament stretching rheometer (DTU-FSR) and a commercial filament stretching rheometer (VADER-1000). We show that the measurements from the EVF are limited by a maximum Hencky strain of 4, while the two filament stretching rheometers are able to probe the nonlinear behavior at larger Hencky strain values where the steady state is reached. With the capability of the filament stretching rheometers, we show that LDPEs with quite different linear viscoelastic properties can have very similar steady extensional viscosity. This points to the potential for independently controlling shear and extensional rheology in certain rate ranges.
Original languageEnglish
JournalRheologica Acta
Volume55
Issue number5
Pages (from-to)343-350
ISSN0035-4511
DOIs
Publication statusPublished - 2016

Keywords

  • Extensional flow
  • Nonlinear viscoelasticity
  • Polyethylene
  • Polymer melt

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