SKM 2023 – wissenschaftliches Programm

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 53: Charged Soft Matter, Polyelectrolytes and Ionic Liquid

CPP 53.4: Vortrag

Donnerstag, 30. März 2023, 16:00–16:15, ZEU 255

KCl modulated D2O Hydration and Subsequent Thermoresponsive Behavior of Poly(sulfobetaine)-Based Diblock Copolymer Thin Films — •Peixi Wang1, Christina Geiger1, Julija Reitenbach1, Apostolos Vagias5, Robert Cubitt2, Viet Hildebrand3, André Laschewsky3, Christine M. Papadakis4, and Peter Müller-Buschbaum1,51TUM School of Natural Sciences, Chair for Functional Materials, Garching — 2Institut Laue-Langevin, Grenoble — 3Fraunhofer-Institut für Angewandte Polymerforschung, Potsdam-Golm — 4TUM School of Natural Sciences, Soft Matter Physics, Garching — 5MLZ, TUM, Garching

The salt effect of KCl on D2O hydration and subsequent thermoresponsive behavior of diblock copolymer (DBC) thin films, which feature a short zwitterionic poly(4-((3-methacrylamidopropyl) dimethylammonio) butane-1-sulfonate)) (PSBP) block and a long nonionic thermo-responsive poly(N-isopropylmethacrylamide) (PNIPMAM) block, is studied by in situ spectral reflectance (SR) and time-of-flight neutron reflectivity (ToF-NR) in combination with isotope sensitivity. The solvation-triggered phase transition upon D2O hydration and subsequent heating is probed in situ by Fourier transform infrared spectroscopy (FT-IR). Besides, the migration and/or aggregation of KCl domains inside the DBC thin films is also demonstrated by complementary methods, namely, X-ray reflectivity (XRR) and atomic force microscopy (AFM).

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