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MM: Fachverband Metall- und Materialphysik

MM 18: Poster Session 2

MM 18.17: Poster

Dienstag, 6. September 2022, 17:30–20:00, P2

Reactive Surface Corrosion of Polypropylene studied with Atomic Force Microscopy — •Julian Cremer¹, Bernhard Kaltschmidt², Andreas Hütten², and Dario Anselmetti¹ — ¹Experimental Biophysics and Applied Nanoscience (BINAS), Bielefeld University — ²Thin Films & Physics of Nanostructures, Bielefeld University

The surface corrosion of various polypropylene samples used for industrial applications was investigated by exposition to oxidative liquids. The samples are formulated by different additive packages and include fillers such as talc or glass fibers for reinforcement. In particular, we study the aging and corrosion of these polypropylene samples in oxidative liquid media, analyzing the influence of temperature and oxidants. Contrary to aging induced by UV radiation, aging in oxidative liquids is rarely studied. Shedding some light on this research area, we placed the polypropylene samples in an oxidative test solution at 95°C, which was constantly renewed. In total, the samples were examined after ten different time steps up to 4000h. Mainly, we used atomic force microscopy (AFM) to image the samples and to determine the Young's modulus, which is a decisive parameter for the age of plastic materials. In some cases, we observe a growth of a fibrous structure on the surface covering nearly the whole sample. To determine the chemical composition of the bloomed structure and follow the aging on a chemical level, attenuated total reflection infrared spectroscopy was performed (ATR-FTIR). We present structural and chemical changes of aged industrial polypropylene as well as the consequence of additive blooming.