  
|
     
|
The European Physical Journal B
ISSN: 1434-6028 (printed version)
ISSN: 1434-6036 (electronic version)
Abstract Volume 3 Issue 1 (1998) pp 83-96
A neutron reflectometry study of polystyrene network interfaces
M. Geoghegan (1) (a), F. Boué (1), G. Bacri (1), A. Menelle (1), D.G. Bucknall (2)
(1) Laboratoire Léon Brillouin (CEA-CNRS), CE-Saclay, 91191 Gif-sur-Yvette Cedex, France
(2) The Rutherford Appleton Laboratory, Chilton, Didcot, Oxfordshire OX11 0QX, UK
Received: 4 December 1996 / Revised: 13 October 1997 / Accepted: 23 December 1997
Abstract: We have used neutron reflectometry to measure interfacial widths between two polystyrene films, where either one or both films are crosslinked. The observed interfacial width between two networks is larger than the size expected for "dangling ends", which suggests motion of heterogeneous regions of the networks. In the case when one of the networks is replaced by a linear polymer, the interfacial profile can be asymmetric with a diffusion "front" of linear polymer penetrating the network to a length scale of up to 200 Å. In the case of a more densely crosslinked network and a high molecular weight linear polymer the interface is symmetric implying negligible penetration.
PACS. 68.35.Ct Interface structure and roughness - 82.70.Gg Gels and sols
(a) Present address: Fakultät für Physik, Universität Freiburg, Hermann-Herder-Straße 3, 79104 Freiburg, Germany email: geog@frbr00.physik.uni-freiburg.de
Article in PDF-Format (506 KB)
Online publication: June 22, 1998
LINK Helpdesk
© EDP Sciences, Springer-Verlag 1998