Berlin 2015 – wissenschaftliches Programm
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 51: P16: New Instruments and Methods
CPP 51.4: Poster
Mittwoch, 18. März 2015, 10:00–13:00, Poster A
Glassy dynamics of polymer brushes: employing an equivalent circuit model to analyze broadband dielectric spectroscopy data — •Martin Tress1, Nils Neubauer1, Rene Winkler2, Petra Uhlmann2, Emmanuel Urandu Mapesa1, Manfred Reiche3, and Friedrich Kremer1 — 1University of Leipzig, 04103 Leipzig, Germany — 2Leibniz-Institut für Polymerforschung Dresden e.V., 01069 Dresden, Germany — 3Max Planck Institute of Microstructure Physics, 06120 Halle (Saale), Germany
The glassy dynamics of poly(2-vinylpyridine) (P2VP) polymer brushes is investigated by means of Broadband Dielectric Spectroscopy (BDS). For that, P2VP brushes are grafted onto an ultra-flat, highly conductive silicon electrode. The latter is part of a recently developed nano-structured electrode arrangement which has been refined to achieve an electrode-to-electrode distance of only ~40 nm. Since the studied brushes exhibit thicknesses between 1.8 to 7 nm, a major fraction of the capacitor volume is empty. To consider the impact of this partial filling as well as the other components in the capacitor (e.g. nano-structure spacers) a sophisticated equivalent circuit model is implemented in the fit function. This enables to unravel polarization effects, charge transport and molecular relaxation.