Regensburg 2013 – wissenschaftliches Programm

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 16: Interfaces and Thin Films II (joint session with DECHEMA and VDI)

CPP 16.9: Vortrag

Dienstag, 12. März 2013, 12:00–12:15, H40

Glassy dynamics of densely packed semi-isolated polymer chains — •Martin Tress, Emmanuel Mapesa, and Friedrich Kremer — Universität Leipzig, Leipzig, Germany

The glassy dynamics of randomly distributed, densely packed semi-isolated poly(2-vinylpyridine) (P2VP) polymer chains is studied by means of Broadband Dielectric Spectroscopy (BDS). Therefore, a recently developed nano-structured electrode arrangement is refined to achieve an electrode-to-electrode distance of only 40 nm. On one of the ultra-flat, highly conductive silicon electrodes semi-isolated polymer coils are deposited. Atomic Force Microscopy scans of the identical sample before and after the BDS measurement reveal that, even for different molecular weights, the mean volume of the coils resembles 5 to 10 times the volume expected for a single chain. Accordingly, the dynamics of coils on average consisting of 5 to 10 (therefore semi-isolated) polymer chains is measured and it compares well with that of bulk though the mean relaxation rate is slowed down by up to half a decade. This is attributed to attractive interactions of the P2VP segments with the supporting silica surface.