Cross-link–induced autophobicity in polymer melts: A re-entrant wetting transition
Department of Materials and Interfaces, Weizmann Institute of Science, 76100 Rehovot, Israel
Accepted: 21 February 1997
We have investigated the wetting behaviour of a polymer melt on top of a cross-linked network of itself. For substrate films that were not cross-linked at all (or at very low cross-link densities) the melt completely wets the underlying layer. At intermediate cross-linking densities we observe dewetting, which we suggest is due to the brush-like surface of the network. At higher cross-linking densities the melt again completely wets the network, due, we believe, to increased roughening of the surface of the cross-linked substrate.
PACS: 68.45.Gd – Wetting / 68.15.+e – Liquid thin films / 61.25.Hq – Macromolecular and polymer solutions; polymer melts; swelling
© EDP Sciences, 1997