Dresden 2003 – wissenschaftliches Programm
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CPP: Chemische Physik und Polymerphysik
CPP 22: POSTER C
CPP 22.32: Poster
Donnerstag, 27. März 2003, 12:00–14:00, ZEU/250
Polymer-Metal Interfaces: Thermal Behavior near the Glass Transition — •Rüdiger Weber1, Ingo Grotkopp1, Jochim Stettner1, Metin Tolan2, Virginie Chamard2, Oliver Seeck3, and Werner Press1 — 1Institut für Experimentelle und Angewandte Physik, Universität Kiel, Leibnizstr. 17-19, 24118 Kiel — 2Experimentelle Physik I, Universität Dortmund, 44221 Dortmund — 3IFF, FZ Jülich GmbH, 52425 Jülich
Polymer-metal nanocluster interfaces have been examined by means of surface sensitive x-ray scattering techniques to study the thermal behavior of polymer films in the bulk and at the surface. Reflectivity as well as grazing incidence small angle scattering (GISAXS) data were taken for polystyrene samples of molecular weight between 3.7 k and 226 k and gold cluster diameters ranging from 2–4 nm at HASYLAB, DESY, and at the ESRF.
In the experiments the samples were heated up to temperatures well above the glass transition temperature Tg. Driven by the lowering of the surface energy an embedding process occurs at a sufficiently low viscosity. It was shown that the cluster embedding starts at temperatures well below Tg, indicating an increased mobility of the polymer chains at the surface.
Besides it has been shown that there is strong dependence between the amount of gold deposited on the polymer surface and the onset of the embedding process which reveals a relatively strong interaction between the polymer and the metal.