Berlin 2018 – scientific programme
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 21: Focus: Smart Hydrogels and Hydrogel Based Devices I - organized by Gerald Gerlach, Walter Richtering and Thomas Hellweg
CPP 21.7: Talk
Tuesday, March 13, 2018, 11:30–11:45, C 130
Water swelling and exchange kinetics of multi-stimuli responsive polymer thin films — •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, 85748 Garching — 2HZG at MLZ, 85747 Garching — 3Universität Potsdam, Inst. für Chemie, 14476 Potsdam Golm
Responsive polymers can react with a strong change in volume towards even small changes of an external stimulus. This behavior makes them attractive for a manifold selection of applications such as nano-sensors, artificial pumps and muscles or optical switches. In order to implement responsive polymers in the aforementioned application fields, a fundamental understanding of the underlying water kinetics of these polymers is necessary. We follow the water and deuterated water swelling and the corresponding exchange processes in a multi-stimuli responsive block copolymer thin film via in-situ time of flight neutron reflectometry (TOF-NR). The kinetic processes are followed with a high time resolution. The observed swelling and exchange kinetics are modelled to obtain detailed insights about the underlying mechanisms of water uptake and exchange.