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Unveiling Temporal Nonlinear Structure-Rheology Relationships under Dynamic Shearing.

Johnny Ching-Wei Lee1, Lionel Porcar2, Simon A Rogers3

  • 1Department of Chemical and Biomolecular Engineering, University of Illinois at Urbana-Champaign, Urbana, IL 61801, USA.

Polymers
|July 19, 2019
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Summary

Researchers developed a 3D structure-rheology space to link microscopic changes in polymer-like micelles (PLMs) to their macroscopic flow behavior under shear. This framework aids in understanding soft material dynamics.

Keywords:
LAOSnonlinear rheologypolymer rheologyrheo SANSstructure–rheology relationshipviscoelasticworm-like micelles

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Area of Science:

  • Soft matter physics
  • Rheology
  • Materials science

Background:

  • Nonlinear rheology aims to connect microscopic structural changes to macroscopic flow responses.
  • Understanding these structure-rheology relationships is crucial for soft materials.

Purpose of the Study:

  • To present a 3D structure-rheology space correlating structural and nonlinear viscoelastic parameters.
  • To demonstrate a framework for studying soft materials under deformation.

Main Methods:

  • Utilized the sequence-of-physical-processes framework.
  • Employed rheo-small-angle neutron scattering (rheo-SANS) techniques.
  • Studied a model system of polymer-like micelles (PLMs) under dynamic shearing.

Main Results:

  • Unveiled a sequence of microscopic events in PLMs during shearing.
  • Observed the least-aligned state of PLMs shifting towards zero strain with increasing frequency.
  • Demonstrated the framework's applicability across various frequencies.

Conclusions:

  • The proposed 3D space is a generic tool for soft materials under deformation.
  • Provides a natural approach to study complex out-of-equilibrium structure-rheology relationships.
  • Facilitates understanding of microscopic rearrangements and macroscopic flow.