Regensburg 2019 – scientific programme
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DY: Fachverband Dynamik und Statistische Physik
DY 2: Responsive and Adaptive Systems (joint session CPP/DY)
DY 2.1: Talk
Monday, April 1, 2019, 09:30–09:45, H8
H2O / D2O swelling and exchange kinetics of a multi-stimuli responsive PNIPAM-based block copolymer thin film — •Lucas Kreuzer1, Tobias Widmann1, Nuri Hohn1, Kun Wang1, Jean-Francois Moulin2, Viet Hildebrand3, André Laschewsky3, Christine M. Papadakis1, and Peter Müller-Buschbaum1 — 1TU München, Physik-Department, LS Funktionelle Materialien, James-Franck-Str. 1, 85748 Garching — 2Helmholtz-Zentrum Geesthacht at Heinz Maier-Leibnitz Zentrum, Lichtenbergstr. 1, 85747 Garching — 3Universität Potsdam, Institut für Chemie, Karl-Liebknecht-Straße 24-25, 14476 Potsdam Golm
Stimuli-responsive polymers can react with a drastic change in properties towards even slight changes in their surrounding environment. Especially in thin film morphology, such films are well-suited for a manifold of applications such as nano-switches, artificial muscles in soft-robotics or sensors. In order to implement stimuli-responsive polymers in the aforementioned application fields, a fundamental understanding of the underlying kinetics is necessary. In our recent work, we followed the H2O and D2O swelling and the corresponding exchange kinetics in a multi-stimuli responsive block copolymer thin film with in-situ time of flight (TOF) neutron reflectometry (NR). TOF-NR enables high time resolution with which the mechanisms of water uptake and exchange can be followed. A theoretical model is applied to describe the swelling and exchange kinetics in order to obtain detailed insights about the underlying mechanisms of these dynamic processes.