Conference paper
Viscosity overshoot followed by steady state measured in uni-axial elongation of LDPE. Ole Hassager, Henrik Koblitz Rasmussen, Anders Bach and Jens Kromann Nielsen
In
Proceedings of the Xivth International Congress on Rheology
—
2004
Abstract
The transient (e.g. start up of) elongational viscosity of three low-density polyethylene (LDPE) melts (BASF Lupolen 1810H, 1840D and 3020D) was measured using a filament stretching rheometer (FSR) capable of measuring at elevated temperatures. The transient uni-axial elongational viscosity showed an overshoot in the transient elongational viscosity followed by a steady viscosity, in all three materials.
This phenomenon was observed at high elongational rates. The steady uni-axial elongational viscosity was about 40-50% less than the maximum in the transient uni-axial elongational viscosity in both the 1840D and the 3020D LDPE melt.
| Language: | English |
|---|---|
| Year: | 2004 |
| Proceedings: | XIV International Congress on Rheology |
| Types: | Conference paper |
| ORCIDs: | Rasmussen, Henrik Koblitz and Hassager, Ole |
