From Wall Slip to Bulk Shear Banding in Entangled Polymer Solutions

This article reviews the past activities and emergent understanding of nonlinear rheology of entangled polymeric liquids, with the purpose of pointing out the remaining challenges. A key component of this subject concerns wall slip and shear strain localization, for example, shear banding. It is emp...

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Bibliographic Details
Published in:Macromolecular chemistry and physics 2019-01, Vol.220 (1), p.n/a
Main Author: Wang, Shi‐Qing
Format: Article
Language:English
Subjects:
Banding
entanglement
Extrapolation
nonlinear rheology
polymer solution
Polymers
Rheological properties
Rheology
shear banding
Shear strain
Strain localization
Wall slip
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Summary:This article reviews the past activities and emergent understanding of nonlinear rheology of entangled polymeric liquids, with the purpose of pointing out the remaining challenges. A key component of this subject concerns wall slip and shear strain localization, for example, shear banding. It is emphasized that wall slip and shear banding are not isolated phenomena and share the same conceptual origin. The concept of the extrapolation length identified for quantification of the magnitude of wall slip is equally useful in determining whether shear banding would occur. An adequate estimate of the extrapolation length is essential for the description of shear banding. This paper concludes by listing some remaining challenges in the field of nonlinear polymer rheology. The article reviews the progress in our understanding of nonlinear shear rheology of entangled polymeric liquids where the key features are wall slip and shear banding. Shear banding takes place only when V well exceeds the limiting slip velocity Vs * involving complete disentanglement between adsorbed and bulk chains.
ISSN:1022-1352
1521-3935
DOI:10.1002/macp.201800327