BPCPPDYSOE21 – wissenschaftliches Programm
Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe
CPP: Fachverband Chemische Physik und Polymerphysik
CPP 22: Poster Session III - Charged Soft Matter and Theory and Simulation
CPP 22.5: Poster
Mittwoch, 24. März 2021, 16:30–18:30, CPPp
Investigation of Cononsolvency Phase Transition of Poly(sulfobetaine)-based Diblock Copolymer Thin Films — •Peixi Wang1, Christina Geiger1, Lucas P. Kreuzer1, Tobias Widmann1, Suzhe Liang1, Robert Cubitt2, André Laschewsky3, Christine M. Papadakis1, and Peter Müller-Buschbaum1 — 1Technische Universität München, Garching, Germany — 2Institut-Laue-Langevin, Grenoble, France — 3Universität Potsdam, Potsdam-Golm, Germany
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(N-isopropylmethacrylamide) (PNIPMAM), 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), shows a strong swelling transition in aqueous media, is newly studied. We focus on the co-nonsolvency behavior of PSBP-b-PNIPMAM thin films in water/acetone mixtures by in situ time-of-flight neutron reflectometry (TOF-NR) and spectral reflectance (SR). Furthermore, Fourier transform infra-red (FTIR) spectroscopy is applied to investigate the interactions between the polymer thin film and water/co-solvent, which strongly alters dependend on their deuteration level.