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Shear thinning in dilute polymer solutions.

J F Ryder1, J M Yeomans

  • 1Rudolf Peierls Centre for Theoretical Physics, 1 Keble Road, Oxford OX1 3NP, England. jfr30@cam.ac.uk

The Journal of Chemical Physics
|November 30, 2006
PubMed
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Shear thinning in polymer solutions is primarily caused by excluded volume effects. This study investigates polymer behavior under shear flow, revealing key factors influencing viscosity and chain dynamics.

Area of Science:

  • Polymer physics
  • Computational fluid dynamics
  • Rheology

Background:

  • Dilute polymer solutions exhibit complex flow behavior.
  • Understanding shear thinning is crucial for material science applications.
  • Molecular dynamics simulations are key to studying polymer solutions.

Purpose of the Study:

  • Investigate shear thinning effects in dilute polymer solutions.
  • Analyze polymer motion, configuration, and viscosity under shear flow.
  • Determine the primary molecular mechanisms driving shear thinning.

Main Methods:

  • Utilized bead-spring polymer models coupled with multiparticle collision dynamics for solvent simulation.
  • Examined polymer radius of gyration and its fluctuations at varying Weissenberg numbers.

Related Experiment Videos

  • Assessed the influence of solvent quality, excluded volume, hydrodynamic coupling, and bond extensibility on polymer viscosity.

    • Main Results:

    • Observed a sharp increase in polymer radius of gyration and fluctuations around Weissenberg number 1 for flexible polymers.
    • Identified excluded volume effects as the dominant contributor to shear thinning.
    • Found suppressed radius of gyration fluctuations and enhanced shear thinning in semiflexible chains compared to flexible ones.

    Conclusions:

    • Excluded volume interactions are the principal cause of shear thinning in polymer solutions.
    • Polymer chain flexibility and rigidity significantly impact shear thinning behavior and viscosity.
    • Simulation results provide molecular-level insights into the rheological properties of polymer solutions.