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Rheologica Acta

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01-02-2014 | Rapid Communication

The role of convective constraint release in parallel superposition flows of nearly monodisperse entangled polymer solutions

Authors: Herwin Jerome Unidad, Giovanni Ianniruberto

Published in: Rheologica Acta | Issue 2/2014

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Abstract

Recent experiments by Li and Wang (Macromolecules 43:5904–5908, 2010) on parallel superposition flows of nearly monodisperse entangled polymer solutions revealing a flow-induced acceleration of the relaxation dynamics are here analyzed by using a simple differential constitutive equation based on the tube model to examine the role of convective constraint release (CCR) in these situations. Contrary to the expectations of Wang and coworkers, we find that such a flow-induced acceleration is not a CCR effect. Rather, our results suggest that the acceleration is simply due to convection per se (not to be confused with CCR) and to nonlinear orientation effects.

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Title: The role of convective constraint release in parallel superposition flows of nearly monodisperse entangled polymer solutions
Authors: Herwin Jerome Unidad
Giovanni Ianniruberto
Publication date: 01-02-2014
Publisher: Springer Berlin Heidelberg
Published in: Rheologica Acta / Issue 2/2014
Print ISSN: 0035-4511
Electronic ISSN: 1435-1528
DOI: https://doi.org/10.1007/s00397-013-0755-x

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