SKM 2021 – scientific programme
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 8: Poster Session III
CPP 8.26: Poster
Wednesday, September 29, 2021, 17:30–19:30, P
Influence of Chaotropic NaBr on the Swelling Behavior of PNIPMAM Thin Films — •Julija Reitenbach1, Christina Geiger1, Peixi Wang1, Lucas P. Kreuzer1, Robert Cubitt2, Viet Hildebrand3, André Laschewsky3, and Peter Müller-Buschbaum1 — 1TU München, Physik-Department, Lehrstuhl für Funktionelle Materialien, James-Franck- Str. 1, 85748 Garching — 2Institut Laue-Langevin, 71 Avenue des Martyrs, CS 20156, 38042 Grenoble Cedex 9, France — 3Universität Potsdam, Institut für Chemie, Karl-Liebknecht-Str. 24-25, 14476 Potsdam-Golm
Thermoresponsive polymer thin films have gained a lot of attention in the past decades due to their attractiveness for a wide range of applications. A variety of polymer showing LCST- or UCST-type behavior are known, and their transition temperatures can be influenced by various factors such as molar mass, end groups, copolymerization or by the addition of salts. For polymers in aqueous solution, it was found that the folding of polymers can be strongly influenced by the type of salt and this ability follows a trend called the Hofmeister series. While this effect is well known in solution, the influence on the swelling behavior of PNIPMAM thin films has yet to be investigated thoroughly. We aim to elucidate the underlying mechanism by spectral reflectance and time-of-flight neutron reflectometry on a macroscopic scale and by in situ Fourier-transform infrared spectroscopy on a molecular level.