Regensburg 2013 – scientific programme

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 40: Focus: Van der Waals at soft matter interfaces: structure and dynamics

CPP 40.5: Talk

Thursday, March 14, 2013, 11:00–11:15, H39

Interface effects on the glass transition temperature in thin supported polymer layers — •Dominik Wöll^1,2, Beate Stempfle¹, Bente Flier¹, and Andreas Zumbusch¹ — ¹Fachbereich Chemie, Universität Konstanz, 78457 Konstanz — ²Zukunftskolleg, Universität Konstanz, 78457 Konstanz

Experimental approaches to study the influence of interfaces on polymer dynamics are challenging. In our contribution, we present widefield fluorescence microscopy studies to investigate the motion of single dye molecules of different size in thin glass-supported polystyrene films up to temperatures of 150 °C. Heterogeneities in the diffusion coefficients of single molecules were attributed to interface effects influencing the glass transition temperature. Monte Carlo random walk simulations with glass transition temperature profiles taken from literature could rationalize our experimental results, thus confirming that changes in the glass transition temperature at the polymer-air interface can reach only few nm into the polymer film.