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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 31: Responsive and Adaptive Polymers
CPP 31.2: Talk
Wednesday, March 19, 2025, 16:45–17:00, H38
Influence of Azobenzene Moieties on the Swelling Behavior of Poly(Dimethylacrylamide) Films in Water Vapor under UV-Irradiation — •David P. Kosbahn1, Julija Reitenbach1, Morgan P. Le Dû1, Lukas V. Spanier1, René Steinbrecher2,3, André Laschewsky2,3, Robert Cubitt4, and Peter Müller-Buschbaum1 — 1TUM School of Natural Sciences, Chair for Functional Materials, 85748 Garching, Germany — 2Institut für Chemie, Universität Potsdam, 14476 Potsdam-Golm, Germany — 3Fraunhofer Institut für Angewandte Polymerforschung, 14476 Potsdam-Golm, Germany — 4Institut Laue-Langevin, 38000 Grenoble, France
This study investigates the swelling behavior of p(AzAm-co-DMAm) films in both isomeric states of the photoswitchable molecule azobenzene (Az). The impact of UV irradiation on swelling in water vapor is examined, with the aim of controlling water uptake, expansion, and nanoscale morphology. This material shows potential for applications in light sensors, photo-actuators, and drug delivery systems. We employ time-resolved FTIR spectroscopy to monitor group vibrations during swelling and irradiation, gaining insights into molecular interactions throughout the isomerization process. Additionally, in situ time-of-flight neutron reflectometry on a thin film provides time- and depth-resolved data on the water distribution along the surface normal. The results shed light on the influence of azobenzene moieties on the polymer's microscopic properties.
Keywords: thermoresponsive; photoresponsive; thin film