WIAS Preprint No. 1560, (2010)

Interface morphologies in liquid/liquid dewetting



Authors

  • Kostourou, Konstantina
  • Peschka, Dirk
    ORCID: 0000-0002-3047-1140
  • Münch, Andreas
  • Wagner, Barbara
  • Herminghaus, Stephan
  • Seemann, Ralf

2010 Mathematics Subject Classification

  • 76A20 35R35 76D08 76-05

Keywords

  • thin films, polymer-polymer dewetting, lubrication theory, numerical solution

Abstract

The dynamics and morphology of a liquid polystyrene (PS) film on the scale of a hundred nanometer dewetting from a liquid polymethylmethacrylate (PMMA) film is investigated experimentally and theoretically. The polymers considered here are both below their entanglement lengths and have negligible elastic properties. A theoretical model based on viscous Newtonian flow for both polymers is set up from which a system of coupled lubrication equations is derived and solved numerically. A direct comparison of the numerical solution with the experimental findings for the characteristic signatures of the cross-sections of liquid/air and liquid/liquid phase boundaries of the dewetting rims as well as the dewetting rates is performed and discussed for various viscosity ratios of the PS and PMMA layers.

Appeared in

  • Chemical Engineering and Processing, 50 (2011) pp. 531--536.

Download Documents