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

Prabhakar Ranganathan, Chandi Sasmal, Duc At Nguyen, Tam Sridhar, J. Ravi Prakash

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9 Citations (Scopus)

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.

Original languageEnglish
Article number011301
Number of pages8
JournalPhysical Review Fluids
Volume2
Issue number1
DOIs
Publication statusPublished - 1 Jan 2017

Keywords

  • polymer solutions
  • hydrodynamic interactions
  • hydrodynamic screening
  • semi-dilute
  • Brownian dynamics
  • extensional flows
  • rheometry
  • rheology

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