Dec 7 – 8, 2021 Online only
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Co-Nonsolvency Transition of PNIPMAM-based Block Copolymer Thin Films in Water/Acetone Mixtures

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Dec 8, 2021, 10:30 AM
1h 30m
Board: P-57
Poster Soft Matter Poster Session II


Peixi Wang (Workgroup Polymer Interfaces, TUM Department of Physics, Technical University of Munich)


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-PNIPMAM thin films in water/acetone-d6 mixed vapors 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 is closely related to their deuteration level.

Primary author

Peixi Wang (Workgroup Polymer Interfaces, TUM Department of Physics, Technical University of Munich)


Christina Geiger (Technical University of Munich, Chair of Functional Materials) Lucas P. Kreuzer (TUM Physik E13) Suzhe Liang (Physical Department, TUM) Christine Papadakis (Technische Universität München, Physik-Department, Fachgebiet Physik weicher Materie) Peter Müller-Buschbaum (TU München, Physik-Department, LS Funktionelle Materialien) Julija Reitenbach Tobias Widmann (TU München, Physik Department, LS Funktionelle Materialien)

Presentation materials