A thermodynamic model for shear-induced concentration banding and macromolecular separation

D. Jou, M. Criado-Sancho, L. F. Del Castillo, J. Casas-Vázquez

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13 Citations (Scopus)

Abstract

We present a simple thermodynamic model for shear-induced concentration banding in polymer solutions, based on a nonequilibrium chemical potential depending on the shear rate. This dependence provides a coupling between diffusion and shear, besides the more classical coupling provided by the divergence of the viscous pressure tensor. When both couplings are taken into account, shear-induced concentration banding appears in a natural way. If the initial homogeneous concentration is higher than a threshold value, shear banding appears for sufficiently high value of the shear rate γ; if the initial concentration is lower, the steady-state concentration profile under shear is smooth. The banding profile depends on the polymer molecular mass and therefore it provides a basis for the chromatographic separation of polymers of different molecular mass. © 2001 Elsevier Science Ltd.
Original languageEnglish
Pages (from-to)6239-6245
JournalPolymer
Volume42
DOIs
Publication statusPublished - 20 Apr 2001

Keywords

  • Macromolecules
  • Shear-induced concentration banding
  • Viscous pressure

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