Berlin 2024 – scientific programme
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 24: Responsive and Adaptive Systems I
CPP 24.3: Talk
Wednesday, March 20, 2024, 10:15–10:30, H 0110
Investigation of the solvent uptake of salt containing PNIPMAM thin films — •Julija Reitenbach1, Peixi Wang1, Linus F. Huber1, Simon A. Wegener1, Robert Cubitt2, Dirk Schanzenbach3, André Laschewsky3, Christine M. Papadakis4, and Peter Müller-Buschbaum1 — 1TUM School of Natural Sciences, Chair for Functional Materials, Garching, Germany — 2Institut Laue-Langevin, 71 Avenue des Martyrs, CS 20156, 38042 Grenoble Cedex 9, France — 3Universität Potsdam, Institut für Chemie, Karl-Liebknecht-Str. 24-25, 14476 Potsdam-Golm — 4TUM School of Natural Sciences, Soft Matter Physics Group, Garching, Germany
Stimuli responsive polymers gained a lot of attention in the past decades due to their unique properties. If polymer thin films exhibit a reversible volume change upon exposure to external stimuli such as temperature, light, pH, or solvents, they become promising candidates for applications such as nanoswitches or sensors. Due to short swelling times and strong volume changes upon solvent incorporation poly(N-isopropyl methacrylamide) (PNIPMAM) thin films are of special interest. In this work, the influence of different salts on the responsivenss of PNIPMAM thin films towards different solvent vapor atmospheres is explored. In situ time-of-flight neutron reflectometry measurements are performed to investigate the macroscopic swelling behavior. To gain further insights on a molecular level and to understand the underlying hydration mechanism, additional in situ Fourier-transform infrared spectroscopy measurements are performed.
Keywords: thin films; stimuli responsive polymer; swelling behavior; salt additives; hydrogel