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journal article·2025-02Open access

Solvation Dynamics of Thermoresponsive Polymer Films: The Influence of Salt Series in Water and Mixed Water/Methanol Atmosphere

Peixi Wang, Tianle Zheng, Julija Reitenbach, Simon A. Wegener, Linus F. Huber, Lucas P. Kreuzer, Suzhe Liang, Robert Cubitt, Ya‐Jun Cheng, Tonghui Xu, Viet Hildebrand, André Laschewsky, Christine M. Papadakis, Peter Müller‐Buschbaum

Advanced Science· Volume 12· Issue 8
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Abstract

Abstract Understanding the salt effects on solvation behaviors of thermoresponsive polymers is crucial for designing and optimizing responsive systems suitable for diverse environments. In this work, the effect of potassium salts (CH3COOK, KCl, KBr, KI, and KNO3) on solvation dynamics of poly(4‐(N‐(3'‐methacrylamidopropyl)‐N,N‐dimethylammonio) butane‐1‐sulfonate) (PSBP), poly(N‐isopropylmethacrylamide) (PNIPMAM), and PSBP‐b‐PNIPMAM films is investigated under saturated water and mixed water/methanol vapor via advanced in situ neutron/optical characterization techniques. These findings reveal that potassium salts enhance the films' hygroscopicity or methanol‐induced swellability. Interestingly, the anions effects do not mirror the empirical Hofmeister series, which describes the salting‐in effects for such polymers in dilute aqueous solution, particularly evident in PSBP films with an approximately inverted order. PNIPMAM and PSBP‐b‐PNIPMAM exhibit pronounced deviations from such an inverted correlation and vary somewhat for water‐rich and methanol‐rich atmospheres. Molecular dynamics (MD) simulations suggest that the observed orders of solvation result from the accessibility of the hydrated solvation shells close to the PSBP‐b‐PNIPMAM chains.
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Research context

Polymers

OpenAlex topics: Surfactants and Colloidal Systems · Material Dynamics and Properties · Electrostatics and Colloid Interactions

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

Chair for Functional Materials Department of Physics TUM School of Natural Sciences Technical University of Munich James‐Franck‐Str. 1 85748 Garching Germany

Heinz Maier‐Leibnitz Zentrum (MLZ) Technical University of Munich Lichtenbergstr. 1 85748 Garching Germany

Institut‐Laue‐Langevin 6 rue Jules Horowitz 38000 Grenoble France

Ningbo Institute of Materials Technology & Engineering Chinese Academy of Sciences 1219 Zhongguan West Rd. Ningbo Zhejiang Province 315201 P.R. China

Department of Chemistry College of Sciences. Shanghai University 200444 Shanghai P. R. China

Institut für Chemie Universität Potsdam Karl‐Liebknecht‐Str. 24–25 14476 Potsdam‐Golm Germany

Fraunhofer Institut für Angewandte Polymerforschung Geiselbergstr. 69 14476 Potsdam‐Golm Germany

Soft Matter Physics GroupDepartment of Physics TUM School of Natural Sciences Technical University of Munich James‐Franck‐Str. 1 85748 Garching Germany

Funding

Deutsche Forschungsgemeinschaft · China Scholarship Council · National Natural Science Foundation of China · Bundesministerium für Bildung, Wissenschaft, Forschung und Technologie

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