Dresden 2009 – wissenschaftliches Programm

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DY: Fachverband Dynamik und Statistische Physik

DY 26: Poster II

DY 26.8: Poster

Donnerstag, 26. März 2009, 16:00–18:00, P1A

Apparent changes in the molecular dynamics of thin polymer layers due to the impact of interfacial layers — •Martin Treß¹, Anatoli Serghei^1,2, and Friedrich Kremer¹ — ¹Institute for experimental physics I, University of Leipzig, Germany — ²Department of Polymer Science and Engineering, University of Massachusetts Amherst, Amherst, MA 01003, USA

Possible mechanisms leading to an apparent faster glassy dynamics in thin polymer layers, as investigated by means of Broadband Dielectric Spectroscopy, are analyzed in detail. It is shown that manifold experimental findings can be traced back to the influence of interfacial sub-layers, where - due to the proximity to solid interfaces - the dielectric function of the polymer is altered and modifies, by that, the overall dielectric response of the polymer films. An experimental setup cloning bulk and interfacial dynamics is measured to evidence how the contribution of the interfacial layer combines with that of the bulk in order to give the total response of a thin polymer film. It is shown that the non-linear character of this combination could lead to apparently discrepant experimental results.