Regensburg 2019 – scientific programme

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DS: Fachverband Dünne Schichten

DS 14: Poster

DS 14.51: Poster

Tuesday, April 2, 2019, 17:00–20:00, Poster E

Metal ions at metal/polymer interfaces — •Maria Sonnenberg, René Gustus, and Wolfgang Maus-Friedrichs — Technische Universität Clausthal, Clausthaler Zentrum für Materialtechnik, Leibnizstraße 9, 38678 Clausthal-Zellerfeld, Germany

Understanding the interaction between thin polymer films and metal surfaces is necessary for the plastics processing industry. During the processing of plastic, polymer is melted in the extruder unit. Often thin polymer layers are formed on the surface of the extruder, which leads to peeling off of partly solidified polymer into the melt. These polymer particles will not melt again and generate weak points within the product. Basic understanding of the underlying mechanisms is important in order to avoid steel/polymer interaction. For this purpose thin layers of polycarbonate were prepared on a silicon wafer. Iron was evaporated onto the polymer surfaces under ultra-high vacuum conditions. Afterwards the samples were heated up to 200°C. The interfaces after metal evaporation and after heating were examined by electron spectroscopy (XPS). Experiments show that the diffusion of iron atoms in the polymer melt occurs. The interaction of polycarbonate with iron atoms was investigated. XPS results indicate the formation of a carbonyl-iron bond and an interaction of iron atoms with the aromatic rings.