Abstract
AbstractThis 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.
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