Berlin 2008 – wissenschaftliches Programm

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 34: POSTERS Polymerphysics

CPP 34.19: Poster

Donnerstag, 28. Februar 2008, 17:00–19:30, Poster A

Force Studies on Responsive Polymeric Brush Surfaces — •Mukesh Kumar Vyas, Konrad Schneider, Bhanu Nandan, and Manfred Stamm — Leibniz Institute of Polymer Research Dresden, Hohe Strasse 6, 01069 Dresden, Germany

Surface forces such as adhesion and friction play important roles in the manipulation, assembly, and operation of micro- and nanoscale devices. We perform atomic force microscope (AFM) based force studies on polystyrene * poly(2-vinylpyridine) (1:1) mixed polymer brushes and corresponding monobrushes in air. Adhesion and friction force behaviour of polymer brush surfaces in contact with inorganic and polymeric surfaces, was studied using silicon tips, silicon nitride tips, colloidal probe with silica particle and colloidal probe with polystyrene (PS) and poly(acrylic acid) brushes on surface. The effect of switching behaviour of chemical composition of binary brush surfaces (on treatment with suitable solvents) on the wettability, surface roughness, and hence on the adhesion and friction properties of the surfaces, was investigated. Surface roughness values for the entire polymer brushes samples were in the same range and had minimal influence on the trend obtained for the force values. Adhesion force values were in accordance with the wettability of the samples. Adhesion and friction values were correlated to wettability for most of the cases except for the silicon tip.