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Transient overshoot extensional rheology of long-chain branched polyethylenes: Experimental and numerical comparisons between filament stretching and cross-slot flow

Hoyle, David M.; Huang, Q.; Auhl, D.; Hassell, D.; Rasmussen, H.K.; Skov, A.L.; Harlen, O.G.; Hassager, O.; McLeish, T.C.B.

Transient overshoot extensional rheology of long-chain branched polyethylenes: Experimental and numerical comparisons between filament stretching and cross-slot flow Thumbnail


Authors

David M. Hoyle

Q. Huang

D. Auhl

D. Hassell

H.K. Rasmussen

A.L. Skov

O.G. Harlen

O. Hassager

T.C.B. McLeish



Abstract

This work analyses the high-strain extensional behavior of long-chain branched polyethylenes, employing two novel extensional rheometer devices, the filament stretching rheometer and the cross-slot extensional rheometer. The filament stretching rheometer uses an active feedback loop to control the imposed strain rate on a filament, allowing Hencky strains of around 7 to be reached. The cross-slot extensional rheometer uses optical birefringence patterns to determine the steady-state extensional viscosity from planar stagnation point flow. The two methods probe different strain-rate regimes and in this paper we demonstrate the agreement when the operating regimes overlap and explore the steady-state extensional viscosity in the full strain-rate regime that these two complimentary techniques offer. For long-chain branched materials, the cross-slot birefringence images show a double cusp pattern around the outflow centre line (named W-cusps). Using constitutive modeling of the observed transient overshoot in extension seen in the filament stretching rheometer and using finite element simulations we show that the overshoot explains the W-cusps seen in the cross-slot extensional rheometer, further confirming the agreement between the two experimental techniques.

Citation

Hoyle, D. M., Huang, Q., Auhl, D., Hassell, D., Rasmussen, H., Skov, A., …McLeish, T. (2013). Transient overshoot extensional rheology of long-chain branched polyethylenes: Experimental and numerical comparisons between filament stretching and cross-slot flow. Journal of Rheology, 57(1), 293-313. https://doi.org/10.1122/1.4767982

Journal Article Type Article
Publication Date Jan 1, 2013
Deposit Date Jan 21, 2013
Publicly Available Date Mar 28, 2024
Journal Journal of Rheology
Print ISSN 0148-6055
Electronic ISSN 1520-8516
Publisher American Institute of Physics
Peer Reviewed Peer Reviewed
Volume 57
Issue 1
Pages 293-313
DOI https://doi.org/10.1122/1.4767982

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Copyright Statement
© 2013 The Society of Rheology. This article may be downloaded for personal use only. Any other use requires prior permission of the author and the American Institute of Physics. The following article appeared in Journal of rheology, 57(1): 293-313 and may be found at https://doi.org/10.1122/1.4767982





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