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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 14: Poster Session II - Complex Fluids and Perovskites

CPP 14.9: Poster

Dienstag, 23. März 2021, 16:30–18:30, CPPp

Co-nonsolvency induced collapse transition in thin PMMA-b-PNIPMAM films — •Julija Reitenbach¹, Christina Geiger¹, Gaetano Mangiapia², Cristiane Henschel³, André Laschewsky³, Christine Papadakis⁴, and Peter Müller-Buschbaum¹ — ¹TU München, Physik-Department, Lehrstuhl für Funktionelle Materialien, James-Franck- Str. 1, 85748 Garching — ²Helmholtz-Zentrum Geesthacht am Heinz Maier-Leibnitz Zentrum, Lichtenbergstr. 1, 85748 Garching — ³Universität Potsdam, Institut für Chemie, Karl-Liebknecht-Str. 24-25, 14476 Potsdam-Golm — ⁴TU München, Physik-Department, Physik weicher Materie, James-Franck- Str. 1, 85748 Garching

Thin films of the thermoresponsive diblock copolymer PMMA-b-PNIPMAM exhibit a co-nonsolvency induced collapse transition when organic cosolvents, like acetone or methanol, are introduced in a certain ratio into the surrounding vapor atmosphere. The macroscopic changes during the swelling in aqueous vapor and the collapse transition in cosolvent vapor mixtures are investigated with spectral reflectance (SR) and time-of-flight neutron reflectometry (ToF-NR) measurements. We reveal the solvent/cosolvent exchange taking place at the polymer functional groups with in situ Fourier-transform infrared spectroscopy (FTIR) and attribute key changes in the local chemical environment to the macroscopic film collapse stages.