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Rheologica Acta

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01-12-2010 | Original Contribution

Capillary breakup extensional rheometry (CaBER) on semi-dilute and concentrated polyethyleneoxide (PEO) solutions

Authors: Oliver Arnolds, Hans Buggisch, Dirk Sachsenheimer, Norbert Willenbacher

Published in: Rheologica Acta | Issue 11-12/2010

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Abstract

Semi-dilute (\(c^\ast < c < c_{\rm e}\)) as well as concentrated, entangled (c > c _e) solutions of PEO yield uniformly thinning, cylindrical filaments in capillary breakup extensional rheometry (CaBER) experiments. Up to c ≈ c _e thinning can be characterized by a single elongational relaxation time λ _E. Comparison with the longest shear relaxation time, λ _S reveals that λ _E/λ _S decreases with increasing concentration or molecular weight according to (c[η])^− 4/3. This is attributed to the large deformation the solutions experience during filament thinning. A factorable integral model including a single relaxation time and a Soskey or Wagner damping function accounting for the large deformation in CaBER experiments is used to calculate λ _E/λ _S and provides good agreement with experimental results. Irrespective of concentration or molecular weight a beads-on-a-string structure occurs prior to filament breakup at a diameter ratio D/D ₀ ≈ 0.01. This instability is supposed to be closely related to a flow-induced phase separation.

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Title: Capillary breakup extensional rheometry (CaBER) on semi-dilute and concentrated polyethyleneoxide (PEO) solutions
Authors: Oliver Arnolds
Hans Buggisch
Dirk Sachsenheimer
Norbert Willenbacher
Publication date: 01-12-2010
Publisher: Springer-Verlag
Published in: Rheologica Acta / Issue 11-12/2010
Print ISSN: 0035-4511
Electronic ISSN: 1435-1528
DOI: https://doi.org/10.1007/s00397-010-0500-7

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