Momentum-dependent interfacial tension in polymer solutions
Institut für Physik, Johannes Gutenberg-Universität Mainz
55099 Mainz, Staudinger Weg 7, Germany
2 Institute for Physical Chemistry, Bulgarian Academy of Sciences 1113 Sofia, Bulgaria
Accepted: 15 April 2002
A model for the interface between a concentrated and a very dilute polymer solution is studied by Monte Carlo simulations at temperatures below the Theta temperature (in bad solvent conditions). The wave-number–dependent interfacial tension is extracted from an analysis of the capillary wave amplitudes. It is shown that decreases monotonically with q2, while no evidence is found for the predicted increase with a positive bending rigidity κ of the interface at large q. Consequences for the interpretations of simulations and experiments on interfacial widths are briefly discussed.
PACS: 68.08.Bc – Wetting / 68.08.-p – Liquid-solid interfaces / 61.25.Hq – Macromolecular and polymer solutions; polymer melts; swelling
© EDP Sciences, 2002