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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 15: Poster I

CPP 15.36: Poster

Montag, 18. März 2024, 18:00–20:00, Poster C

Photoswitchable Molecules: Impact on Swelling in Thermoresponsive Polymer Films under UV Irradiation — •David P. Kosbahn¹, Julija Reitenbach¹, Morgan Le Dû¹, Lukas V. Spanier¹, René Steinbrecher^2,3, André Laschewsky^2,3, Robert Cubitt⁴, Thomas Saerbeck⁴, Christine M. Papadakis¹, and Peter Müller-Buschbaum^1,5 — 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 — ⁵MLZ, TUM, 85748 Garching, Germany

In this study, we investigated the swelling characteristics of p(AzAm-co-DMAm) and p(AzPyAm-co-DMAm) thin films in both isomer states of the photoswitchable molecules azobenzene (Az) and azopyrazole (AzPy). The influence of UV-irradiation on the swelling behavior in water vapor was explored, aiming to control water uptake, expansion, and morphology on the nanoscale. These materials hold promise for applications such as light sensors, photo-actuators, and drug-delivery systems. Utilizing in situ time-of-flight neutron reflectometry measurements with high temporal resolution at the D17 instrument at ILL, we obtained depth-resolved data about the water distribution during swelling, drying, and irradiation in the dry and swollen states. Our results reveal insights into how photoswitchable molecules affect the microscopic properties of thin polymer films.