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CPP: Chemische Physik und Polymerphysik
CPP 15: POSTER: Polymers and Biomaterials
CPP 15.21: Poster
Tuesday, March 9, 2004, 17:00–19:00, B
Infrared ellipsometry for investigation of heterogeneous polyethylene films — •K. Hinrichs1, M. Gensch1, A. Röseler1, U. Schade2, H. M. Heise3, and E. H. Korte1 — 1Institut für Spektrochemie und Angewandte Spektroskopie - Institutsteil Berlin, — 2Berliner Elektronenspeicherring-Gesellschaft für Synchrotronstrahlung mbH, Albert- Einstein-Str. 15,D- 12489 Berlin — 3Institut für Spektrochemie und Angewandte Spektroskopie - Institutsteil Dortmund
Free standing films of different polyethylene grades are investigated by infrared ellipsometry. In order to determine the optical constants the measured ellipsometric spectra are simulated in an optical layer model. The investigation in a reflection geometry is of advantage because the about 0.5 mm thick films are not transparent in the spectral range of the absorption bands of the CH2 bending and stretching vibrations. The ellipsometric spectra using a globar source or the radiation of the synchrotron storage ring at BESSY II are discussed with respect to a lateral heterogeneity in thickness and chemical structure.