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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 22: Poster Session III - Charged Soft Matter and Theory and Simulation

CPP 22.16: Poster

Mittwoch, 24. März 2021, 16:30–18:30, CPPp

Co-nonsolvency-type behavior of a poly(sulfobetaine) and a poly(N-isopropylmethacrylamide) thin film in water / methanol vapor — •Lucas P. Kreuzer¹, Christoph Lindenmeier¹, Christina Geiger¹, Tobias Widmann¹, Viet Hildebrand², André Laschewsky², Christine M. Papadakis¹, and Peter Müller-Buschbaum¹ — ¹TU München, Physik- Department, LS Funktionelle Materialien, 85748 Garching — ²Universität Potsdam, Institut für Chemie, 14476 Potsdam Golm

The behavior of a poly(sulfobetaine) (PSPE) and a poly(Nisopropylmethacrylamide)(PNIPMAM) thin film in pure water and in mixed water/methanol vapor is studied in-situ with spectral reflectance and Fourier-transform infrared spectroscopy. While PSPE is insoluble in methanol, PNIPMAM is soluble but exhibits a co-nonsolvency behavior in water/methanol mixtures. In thin film geometry, both the PSPE and PNIPMAM swell in pure water vapor, while upon methanol addition, they contract. Their behavior differs significantly regarding the amount of absorbed water in pure water vapor, and the contraction mechanism in mixed water/methanol vapor. The PSPE thin film shows an abrupt one-step contraction, while the PNIPMAM contraction occurs in two steps. When changing to a pure methanol vapor, both, the PSPE and PNIPMAM thin film, show a higher swelling degree than in mixed water/methanol vapor, which indicates a co-nonsolvency-type behavior in polymer thin films.