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Published in: Rheologica Acta 7/2013

01-07-2013 | Original Contribution

Assessing the practical utility of the hole-pressure method for the in-line rheological characterization of polymer melts

Authors: Paulo F. Teixeira, Loic Hilliou, José A. Covas, João M. Maia

Published in: Rheologica Acta | Issue 7/2013

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Abstract

The most promising method capable of providing accurate measurements of the first and second normal-stress differences in shear flows at shear rates typical of polymer processing is the so-called hole-pressure method, but its use has not been as widespread as would be expected, namely due to the experimental difficulties associated with performing such experiments accurately. In this work, we use a small-scale modular slit die to assess the practical utility of the method for in-line monitoring of polymer melt flow. We provide a quantitative analysis of intrinsic error sources and use state-of-the-art data acquisition tools to minimize errors associated with pressure transducers. Our results demonstrate that the method can be used to accurately measure the viscosity and first normal-stress difference in melts but probably not the second normal-stress difference because the intrinsic errors are too high, even when the influence of all the potential error sources is minimized or eliminated.

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Metadata
Title
Assessing the practical utility of the hole-pressure method for the in-line rheological characterization of polymer melts
Authors
Paulo F. Teixeira
Loic Hilliou
José A. Covas
João M. Maia
Publication date
01-07-2013
Publisher
Springer-Verlag
Published in
Rheologica Acta / Issue 7/2013
Print ISSN: 0035-4511
Electronic ISSN: 1435-1528
DOI
https://doi.org/10.1007/s00397-013-0695-5

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