Dresden 2014 – wissenschaftliches Programm

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 37: Poster Session 2

CPP 37.42: Poster

Mittwoch, 2. April 2014, 15:00–19:00, P3

Surface Dynamics of Liquid, Thin Polymer Films — •Fan-Yen Lin, Hans-Jürgen Butt, and Werner Steffen — Max Planck Institute for Polymer Research, P.O. Box 3148, 55128 Mainz, Germany

The emerging technique of resonance enhanced dynamic light scattering (REDLS)[1] was used to study the motions of polymer chains in thin polymer films at different length scales. The polybutadiene (PB) we measured is close to a Newtonian or ideal viscous polymer liquid at room temperature (Tg+125°C). The surface dynamics found can be described by a hydrodynamic capillary wave model[2].

Our studies show the surface dynamics to be strongly suppressed when the length scale is below 25nm. We observe a stiffening behavior decreasing the length scale and by this increasing the confinement. The overall behavior of the dynamics can be explained by a three layer model, bulk behavior in the middle, a more mobile layer at the polymer-air interface and a less mobile layer at the solid substrate-polymer interface.

1, Plum MA, Menges B, Fytas G, Butt HJ, Steffen W, Rev. Sci Instr. 2011, 82, 015102

2, Kim H, Rühm A, Lurio LB, Basu JK, Lal J, Lumma D, Mochrie SGJ, and Sinha SK, Phys. Rev. Lett. 2003, 90, 068302