The effects of long-ranged and short-ranged forces in confined near-critical polymeric liquidsC. Carelli1, R. A. L. Jones2, R. N. Young2, R. Cubitt3, R. Krastev4, T. Gutberlet5, R. Dalgliesh6, F. Schmid7 and M. Sferrazza8
1 Department of Physics, University of Surrey - Guildford, UK
2 Department of Physics and Astronomy, University of Sheffield - Sheffield, UK
3 ILL, Institute Max Von Laue-Paul Langevin - Grenoble, France
4 Hahn-Meitner Institut - Berlin, Germany
5 SINQ, Paul Scherrer Institut - Villigen, Switzerland
6 ISIS, Rutherford Appleton Laboratory - Chilton, UK
7 Fakultät für Physik, Universität Bielefeld - Bielefeld, Germany
8 Département de Physique, Université Libre de Bruxelles Boulevard du Triomphe, CP 223, 1050 Bruxelles, Belgium
received 19 April 2005; accepted in final form 8 July 2005
published online 3 August 2005
The relative importance of long- and short-ranged forces on the thermal fluctuations at polymer interfaces was investigated with neutron reflection. Polyolefin blends were synthesised to create polymer pairs with a tuned interaction parameter, allowing the exploration of situations from near criticality to strongly immiscible cases in thin-film systems. We have observed for the polymer interfacial width, a transition from a region where long-ranged forces dominate, at higher degree of incompatibility, to a region approaching criticality where short-ranged truncation forces are more relevant.
61.41.+e - Polymers, elastomers, and plastics.
61.12.Ha - Neutron reflectometry.
68.35.Fx - Diffusion; interface formation.
© EDP Sciences 2005