Dec 8 – 9, 2022
Marriott
Europe/Berlin timezone

Co-nonsolvency-Triggered Contraction of Poly(sulfobetaine)-based Diblock Copolymer Thin Films in Water/Acetone Atmosphere

Dec 9, 2022, 2:00 PM
3h
Marriott

Marriott

Board: P-005
Poster Soft Matter Poster Session

Speaker

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

Description

Co-nonsolvency occurs if a mixture of two good solvents causes the collapse or demixing of polymers into a polymer-rich and solvent-rich phase in a certain range of compositions of these two solvents. The nonionic thermo-responsive polymer, poly(N-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 mixtures by in situ time-of-flight neutron reflectometry (TOF-NR) and spectral reflectance (SR). Furthermore, Fourier transform infrared (FT-IR) 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)

Co-authors

Christina Geiger (Technical University of Munich, Chair of Functional Materials) Christine M. Papadakis (Soft Matter Physics Group, Physics Department, Technical University of Munich, Garching, Germany) Julija Reitenbach Dr Lucas Kreuzer (MLZ (FRM II, TUM)) Peter Müller-Buschbaum (Technische Universität München, Fakultät für Physik, Lehrstuhl für Funktionelle Materialien) Suzhe Liang (Physical Department, TUM)

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