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Flow-Induced Concentration Nonuniformity and Shear Banding in Entangled Polymer Solutions.

Michael C Burroughs1, Yuanyi Zhang1, Abhishek M Shetty2

  • 1Department of Chemical Engineering, University of California, Santa Barbara, Santa Barbara, California 93106, USA.

Physical Review Letters
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Entangled polymer solutions can form shear bands when subjected to high shear rates, leading to changes in concentration and velocity. This study experimentally confirms these flow-induced changes, highlighting the crucial link between flow and concentration in polymer solutions.

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Area of Science:

  • Polymer physics
  • Rheology
  • Soft matter science

Background:

  • Recent theoretical models predict shear banding in entangled polymer solutions due to flow-induced demixing.
  • Understanding the behavior of polymers under shear is crucial for various industrial applications.

Purpose of the Study:

  • To experimentally investigate the in situ concentration profiles of entangled polymer solutions under shear.
  • To validate theoretical predictions of shear banding and flow-induced demixing.

Main Methods:

  • Utilized an experimental setup to probe the concentration profile of entangled polymer solutions.
  • Applied shear to the polymer solutions and measured changes in concentration and velocity.
  • Compared experimental results with steady-state model predictions.

Main Results:

  • Observed the development of shear bands in concentration and velocity profiles at critical shear rates.
  • Achieved quantitative agreement between experimental findings and steady-state model predictions.
  • Demonstrated the occurrence of unstable flow-induced demixing.

Conclusions:

  • The study provides the first experimental evidence of shear banding in entangled polymer solutions.
  • Confirms the critical role of flow-concentration coupling in the behavior of these systems.
  • Highlights the importance of considering flow-induced demixing in polymer rheology models.