Regensburg 2010 – scientific programme
Parts | Days | Selection | Search | Downloads | Help
CPP: Fachverband Chemische Physik und Polymerphysik
CPP 31: Poster: Polymer Dynamics
CPP 31.14: Poster
Wednesday, March 24, 2010, 17:30–19:00, Poster C
Real and apparent effects on glassy dynamics in thin polymer layers — •Martin Treß1, Emmanuel U. Mapesa1, Anatoli Serghei2, and Friedrich Kremer1 — 1Universität Leipzig, Germany — 2University of Amherst, USA
Numerous studies report changes of glassy dynamics in thin polymer layers. A careful investigation of the preparative factors reveals that remaining solvent can act as plasticizer and annealing in presence of oxygen or water vapour may cause chain breaking and hence chemical degradation. Futhermore physical aging has to be considered. Additionally to these effects on glassy dynamics there is an apparent effect which arises from the fact that the measured net impedance of a sample is influenced by interfacial effects. Analytical and numerical analysis of a simple layer model show that oxide layers at the interfaces of the electrodes can have strong impact on the dielectric net function of the sample, especially in the case of thin films. Based on an analysis of these real and apparent effects it is found that the molecular dynamics in thin polymer layers is not altered down to thicknesses of 5 nm.