Dresden 2003 – wissenschaftliches Programm
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CPP: Chemische Physik und Polymerphysik
CPP 22: POSTER C
CPP 22.39: Poster
Donnerstag, 27. März 2003, 12:00–14:00, ZEU/250
Friction between Polymer bearing Surfaces: Steady-state Sliding versus Transient Behavior — •Torsten Kreer1, Martin Mueser2 und Kurt Binder1 — 1Institut fuer Physik, WA 331, Universitaet Mainz, 55099 Mainz, Germany — 2Department of Applied Mathematics, University of Western Ontario, London, Ontario N6A 5B7, Canada
We present data of a molecular dynamics simulation adressing the friction mechanisms between polymer brushes in relativ lateral motion. Results for steady state sliding are compared to the transient behaviour where the direction of the motion is inverted. We also investigate structural and shear stress relaxation when the relative motion of the brushes is brought to an immediate stop.
In the steady-sliding regime no brush swelling is observed and shear thinning is mainly attributed to the orientation of the chains along the direction of motion. Only if we turn the sliding direction abruptly we observe an increase of the brush height and therefore a maximum of the shear stress is found.