Bayreuth 1998 – wissenschaftliches Programm
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PO: Polymerphysik
PO 5: Poster: Glasübergang
PO 5.11: Poster
Mittwoch, 11. März 1998, 15:25–17:15, P1
Viscosity and Lateral Diffusion in Thin Polymer Films around the Glass Transition — •Marc Hamdorf and Diethelm Johannsmann — Max-Planck-Institut f"ur Polymerforschung, Ackermannweg 10 D-55128 Mainz
We report on the migration and diffusion in thin polymer
films. The polymer dynamics is probed via the decay of stamped (migration) and
photobleached (diffusion) gratings, when the film is heated to above Tg.
The decay of stamped corrugation gratings is biexponential.
The fast process is associated with unrelaxed stress components created during
stamping. The second process is driven by interfacial tension and can be
used to calculate the film viscosity.