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Related Experiment Videos

Viscoelastic phase separation in shear flow.

Tatsuhiro Imaeda1, Akira Furukawa, Akira Onuki

  • 1Aichi Gakusen University, Toyota 471-8532, Japan.

Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics
|December 17, 2004
PubMed
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This study numerically investigates viscoelastic phase separation in polymer solutions under shear. Results show coupled stress and diffusion dynamics, leading to steady two-phase states where domain size inversely correlates with shear stress.

Area of Science:

  • Polymer Physics
  • Materials Science
  • Rheology

Background:

  • Phase separation in polymer solutions is influenced by external fields.
  • Understanding the interplay between viscoelasticity and phase separation is crucial for materials design.

Purpose of the Study:

  • To numerically investigate viscoelastic phase separation in polymer solutions under shear flow.
  • To explore the coupling between viscoelastic stress and diffusion dynamics.

Main Methods:

  • Utilized a time-dependent Ginzburg-Landau model.
  • Incorporated a conformation tensor to represent polymer chain deformations and viscoelastic stress.
  • Simulated two-fluid dynamics for polymer and solvent interactions.

Main Results:

Related Experiment Videos

  • Identified dynamically coupled stress and diffusion.
  • Observed interface formation below the coexistence curve, with solvent acting as a lubricant.
  • Found steady two-phase states where domain size is inversely proportional to average shear stress.
  • Noted large temporal fluctuations in deviatoric stress components and transient negative normal stress differences.

Conclusions:

  • Viscoelastic stress significantly impacts phase separation dynamics in polymer solutions.
  • The observed coupling leads to unique steady-state morphologies and stress behaviors under shear.
  • Results provide insights into controlling polymer solution microstructure through shear.