Regensburg 2004 – wissenschaftliches Programm

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CPP: Chemische Physik und Polymerphysik

CPP 15: POSTER: Polymers and Biomaterials

CPP 15.10: Poster

Dienstag, 9. März 2004, 17:00–19:00, B

The effect of surface interactions on the molecular dynamics under the confinement of thin layers — •Anatoli Serghei and Friedrich Kremer — Institute for Experimental Physics I, University of Leipzig, Linnestr. 5, 04103, Leipzig, Germany

A novel method for preparation of thin polymeric films was developed and employed to investigate the molecular dynamics of cis-polyisoprene under confinement using BDS (Broadband Dielectric Spectroscopy, 0.1 Hz-10 MHz, 200 K-400 K). The method consists in placing a thin polymer film via spin-coating or solvent-casting between two hard, flat, conductive electrodes (optical polished highly doped silicon wafers having a macroscale roughness of   2 nm), as spacers being used silica nanocolloids with a well-defined size distribution. The film thickness, reaching values of tens of nanometers, can be additionally controlled by measuring the sample capacity. By chemically treating the surface of one or of both electrodes, our method allows us to investigate the effect of the interfacial interactions on the dynamics of thin films.