Berlin 2012 – wissenschaftliches Programm

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DY: Fachverband Dynamik und Statistische Physik

DY 8: Glasses I (with CPP, talks by CPP)

DY 8.6: Vortrag

Montag, 26. März 2012, 16:45–17:00, C 243

Glassy dynamics of isolated polymer coils — •Martin Treß, Emmanuel Mapesa, and Friedrich Kremer — Universität Leipzig, Leipzig

For the first time, the glassy dynamics of randomly distributed, isolated poly(2-vinylpyridine) (P2VP) polymer coils is studied by means of Broadband Dielectric Spectroscopy (BDS). This is achieved by recently developed nano-structured electrode arrangements where isolated polymer coils are deposited onto ultra-flat, highly conductive silicon electrodes. Atomic Force Microscopy scans of the identical sample before and after the BDS measurement prove that the volume of the coils matches, within a factor of 10 (reflecting the broad molecular weight distribution), with the expected volume of a single chain (considering bulk density and the respective molecular weight). The observed dynamics compares well with that of bulk but is slowed down by a factor of about 10. This is attributed to attractive interactions of the P2VP segments with the supporting silica surface.