Regensburg 2004 – scientific programme
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CPP: Chemische Physik und Polymerphysik
CPP 7: Physics of Polymers I
CPP 7.3: Talk
Monday, March 8, 2004, 14:30–14:45, H 37
Structural and dynamic properties and aging mechanisms of thin epoxy network layers — •Jörn Kanzow1, Franz Faupel 1, Carsten Wehlack2, Wulff Possart2, Laszlo Liszkay3, Werner Egger3, Peter Sperr3, and Gottfried Kögel3 — 1Technische Fakultät, Lehrstuhl für Materialverbunde, Universität Kiel — 2Arbeitsgruppe Strukturforschung, Polymere, Grenzschichten, Universität des Saarlandes — 3Fakultät für Luft- und Raumfahrttechnik, Universität der Bundeswehr München
Thin layers of the cured epoxy resin system DGEBA-DETA show a strong variation of the glass transition temperature depending on the film thickness, which is by far more extensive than expected from a confinement effect discussed for thermoplastic polymers. Both bulk and surface properties were studied due to a combination of a new method using XPS to probe the surface embedding properties of metallic nanoclusters [1,2] and positron annihilation lifetime spectroscopy (PALS). PALS is an excellent experimental tool to determine free volume and therefore structural and dynamic properties as well as aging mechanisms. Its sensitivity to small concentrations of electron acceptors gives valuable additional information. Aging mechanisms of cured thin epoxy network layers were studied by performing a non-destructive depth-profiling using the positron beam facility at the Universität der Bundeswehr, Munich.
[1] V. Zaporojtchenko, T. Strunskus, J. Erichsen, and F. Faupel, Macromolecules, 34, 5, 1125 (2001). [2] J. Erichsen, J. Kanzow, U. Schürmann, K. Dolgner, K. Günther-Schade, T. Strunskus, V. Zaporojtchenko, and F. Faupel, Macromolecules, acc. 2003.