Berlin 2024 – scientific programme

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DS: Fachverband Dünne Schichten

DS 11: Poster I (joint session DS/MM/O)

DS 11.27: Poster

Wednesday, March 20, 2024, 17:00–19:00, Poster B

Interaction study between thin films of polyvinyl acetate and (plasma-treated) aluminum — •Sascha Zimmermann¹, Philipp Moritz¹, Oliver Höfft¹, Lienhard Wegewitz¹, Wolfgang Maus-Friedrichs¹, and Sebastian Dahle² — ¹Clausthal University of Technology, Germany — ²University of Ljubljana, Slovenia

Composite materials made of wood and aluminum are becoming increasingly popular due to the combination of their properties. However, in order to exploit these advantages, the two materials must be bonded with sufficient stability. While the adhesive polyvinyl acetate (PVAc) exhibits high adhesive strength on wood, its bonding capabilities with aluminum are limited. The surface of the aluminum must therefore be modified. In this work, the aluminum surface is treated with a dielectric barrier discharge plasma in air with the aim of enabling molecular interactions. Various analytical techniques, including X-ray photoelectron spectroscopy (XPS), Reflection Absorption Infra-Red Spectroscopy (RAIRS) and Atomic Force Microscopy (AFM), are employed to analyse the chemical interactions between aluminum and PVAc. This involves producing nm-thin films using spin coating. For untreated aluminum, no interactions were detected. AFM revealed the inability to deposit nanometer-thin films due to the lack of interactions, leading to the formation of PVAC-clusters. Plasma-treated aluminum led to a stronger chemical shift in the XPS spectra indicating hydrogen bonding. This finding was confirmed by RAIRS, which shows bands associated with hydrogen bonding.