Research assistant and PhD candidate Laboratory of adhesives and polymers
ZHAW School of Engineering IMPE Institute of Materials and Process Engineering
Roman Günther obtained a Master of Science in Advanced Materials and Processes from the Friedrich Alexander University in Erlangen in 2016. In 2017 Mr. Günther joined the Zurich University of Applied Science in Winterthur in the Laboratory of adhesives and polymers as a research assistant. 3 years ago he started his joint PhD studies in a corporation with ETH Zurich. Mr. Günther will finish his PhD in the spring of 2023.
Reversible direct bonding of polymers through surface modification
Smooth polystyrene (PS) and polyamide 12 (PA 12) surfaces were produced via an injection molding process followed by a smoothing process and subsequently treated with O2 plasma to increase the number of polar groups capable of hydrogen bond formation on the surface. The presence of related groups was evident from XPS and contact angle measurements. The sample topographies were investigated by AFM. The plasma treatment allowed the joining of the substrates without adhesive by pressing the substrates together below or around Tg. Notably, not only substrates of the same polymer but also polystyrene and polyamide 12, which are incompatible, were joined with this method. The adhesion between the substrates was determined using a LUMifrac apparatus. Adhesive strengths up to 5.5 MPa were obtained. Remarkably, the joint substrates could be rapidly de-bonded on demand simply by treatment with water, and the separated substrates could be re-bonded by renewed plasma treatment. This bonding technique shows the potential of adhesive-free reversible bonding of polymers which could help to increase the recyclability of polymers and therefore reduce polymeric waste.
Friday, 16 September 2022, 9:30 - 10:00