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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 51: Poster Session III-2
CPP 51.8: Poster
Dienstag, 17. März 2020, 14:00–16:00, P2/EG
Co-nonsolvency transition of PNIPMAM-based block copolymer thin films in a series of binary mixtures — •Peixi Wang1, Christina Geiger1, Lucas P. Kreuzer1, Tobias Widmann1, Robert Cubitt2, André Laschewsky3, Christine M. Papadakis4, and Peter Müller-Buschbaum1 — 1TU München, Physik-Department, LS Funktionelle Materialien, 85748 Garching, Germany — 2Institut Laue-Langevin, 38042 Grenoble, France — 3Fraunhofer-Institut für Angewandte Polymerforschung, 14476 Potsdam-Golm, Germany — 4TU München, Physik-Department, Physik weicher Materie, 85748 Garching
Co-nonsolvency occurs if a mixture of two good solvents causes the collapse or demixing of polymers into a polymer-rich phase in a certain range of compositions of these two solvents. The nonionic thermo-responsive polymer, poly(isopropylmethacrylamide) (PNIPMAM), which features a lower critical solution temperature (LCST) in aqueous solution, has been widely used to investigate its collapse transition behavior in a mixture of two competing good solvents. However, co-nonsolvency response of its block copolymer containing the zwitterionic poly(sulfobetaine)s, especially poly(4-((3-methacrylamidopropyl)dimethyllammonio)butane-1-sulfonate)) (PSBP)*which exhibits an lower upper critical solution temperature (UCST) and shows a strong swelling transition in aqueous media, is newly studied. We focus on the co-nonsolvency behavior of PSBP-b-PNIPAM thin films in a series of deuterated binary mixtures by using time-of-flight neutron reflectometry (TOF-NR).