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Approaching criticality in polymer-polymer systems.

C Carelli1, R A L Jones, R N Young

  • 1Department of Physics, University of Surrey, Guildford, United Kingdom.

Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics
|October 26, 2005
PubMed
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The interfacial width of polymer blends depends on their miscibility and approaches a critical point. Neutron reflectivity and self-consistent field theory reveal how chain length and polymer interactions influence this width.

Area of Science:

  • Polymer Science
  • Materials Science
  • Physical Chemistry

Background:

  • Understanding polymer blend interfaces is crucial for material properties.
  • The critical point signifies a transition in blend miscibility.

Purpose of the Study:

  • To investigate the interfacial width of polyolefin blends.
  • To determine how interfacial width changes with distance from the critical point.

Main Methods:

  • Neutron reflectivity was used to probe interfacial width.
  • Self-consistent field theory numerical calculations were performed.
  • The contribution of capillary waves was included.

Main Results:

  • Interfacial width increases slowly with decreased immiscibility for strongly immiscible pairs.

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  • Interfacial width depends on the polymer interaction parameter (chi).
  • Near the critical point, interfacial width divergence is influenced by chain length and chi.

    • Conclusions:

    • Self-consistent field theory with capillary waves accurately describes interfacial width.
    • The findings are particularly relevant for intermediate degrees of immiscibility.