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Effect of stretching-induced changes in hydrodynamic screening on coil-stretch hysteresis of unentangled polymer solutions

Ranganathan Prabhakar1,*, Chandi Sasmal2, Duc At Nguyen2, Tam Sridhar2, and J. Ravi Prakash2

  • 1Department of Mechanical and Aerospace Engineering, Monash University, Clayton, Victoria 3800, Australia
  • 2Department of Chemical Engineering, Monash University, Clayton, Victoria 3800, Australia

  • *prabhakar.ranganathan@monash.edu
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Phys. Rev. Fluids 2, 011301(R) – Published 5 January, 2017

DOI: https://doi.org/10.1103/PhysRevFluids.2.011301

Abstract

Extensional rheometry and Brownian dynamics simulations of flexible polymer solutions confirm predictions based on blob concepts that coil-stretch hysteresis in extensional flows increases with concentration, reaching a maximum at the critical overlap concentration c* before progressively vanishing in the semidilute regime. These observations demonstrate that chain stretching strengthens intermolecular hydrodynamic screening in dilute solutions, but weakens it in semidilute solutions. Flow can thus strongly modify the concentration dependence of viscoelastic properties of polymer solutions.

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Phys. Rev. Fluids 2, 011301(R)– Published 5 January, 2017
  • Received 7 September 2016

©2017 American Physical Society

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