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Lateral phase separation in polymer-blend thin films: surface bifurcation.

Sam Coveney1, Nigel Clarke1

  • 1Department of Physics and Astronomy, University of Sheffield, Hicks Building, Hounsfield Road, Sheffield S3 7RH, United Kingdom.

Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics
|July 15, 2014
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Summary

Simulations reveal a surface bifurcation mechanism driving lateral phase separation in polymer blends. A transient wetting layer coupled with wall interactions controls this dynamic process.

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Area of Science:

  • Polymer Science
  • Materials Science
  • Physical Chemistry

Background:

  • Confined polymer blends exhibit complex phase behavior.
  • Understanding phase separation dynamics is crucial for material design.

Purpose of the Study:

  • To elucidate the mechanism of lateral phase separation in binary polymer blends confined by selectively attracting walls.
  • To identify the role of transient wetting layers and boundary conditions in this process.

Main Methods:

  • Computational simulations of binary polymer blends.
  • Analysis of equilibrium phase behavior in confined geometries.
  • Investigation of interfacial dynamics using Hamiltonian phase portraits.

Main Results:

  • Equilibrium phases are governed by 1D vertical phase equilibria.
  • Effective boundary conditions from walls pin the film profile.
  • Interfacial distortion in a transient wetting layer couples to lateral phase separation.
  • A surface bifurcation mechanism controls phase separation dynamics via wall volume fraction evolution.

Conclusions:

  • The study identifies a novel surface bifurcation mechanism for lateral phase separation.
  • Transient wetting layers and wall interactions are key to controlling phase separation dynamics.
  • Solvent evaporation may potentially enhance this separation mechanism.