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In this work, the effect of potassium salts (CH<jats:sub>3<\/jats:sub>COOK, KCl, KBr, KI, and KNO<jats:sub>3<\/jats:sub>) on solvation dynamics of poly(4\u2010(<jats:italic>N<\/jats:italic>\u2010(3'\u2010methacrylamidopropyl)\u2010<jats:italic>N,N<\/jats:italic>\u2010dimethylammonio) butane\u20101\u2010sulfonate) (PSBP), poly(<jats:italic>N<\/jats:italic>\u2010isopropylmethacrylamide) (PNIPMAM), and PSBP\u2010<jats:italic>b<\/jats:italic>\u2010PNIPMAM 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\u2010induced swellability. Interestingly, the anions effects do not mirror the empirical Hofmeister series, which describes the salting\u2010in effects for such polymers in dilute aqueous solution, particularly evident in PSBP films with an approximately inverted order. PNIPMAM and PSBP\u2010<jats:italic>b<\/jats:italic>\u2010PNIPMAM exhibit pronounced deviations from such an inverted correlation and vary somewhat for water\u2010rich and methanol\u2010rich 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\u2010<jats:italic>b<\/jats:italic>\u2010PNIPMAM chains.<\/jats:p>","DOI":"10.1002\/advs.202408073","type":"journal-article","created":{"date-parts":[[2024,12,31]],"date-time":"2024-12-31T04:41:04Z","timestamp":1735620064000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":4,"title":["Solvation Dynamics of Thermoresponsive Polymer Films: The Influence of Salt Series in Water and Mixed Water\/Methanol Atmosphere"],"prefix":"10.1002","volume":"12","author":[{"given":"Peixi","family":"Wang","sequence":"first","affiliation":[{"name":"Chair for Functional Materials Department of Physics TUM School of Natural Sciences Technical University of Munich  James\u2010Franck\u2010Str. 1 85748 Garching Germany"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Tianle","family":"Zheng","sequence":"additional","affiliation":[{"name":"Chair for Functional Materials Department of Physics TUM School of Natural Sciences Technical University of Munich  James\u2010Franck\u2010Str. 1 85748 Garching Germany"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Julija","family":"Reitenbach","sequence":"additional","affiliation":[{"name":"Chair for Functional Materials Department of Physics TUM School of Natural Sciences Technical University of Munich  James\u2010Franck\u2010Str. 1 85748 Garching Germany"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Simon A.","family":"Wegener","sequence":"additional","affiliation":[{"name":"Chair for Functional Materials Department of Physics TUM School of Natural Sciences Technical University of Munich  James\u2010Franck\u2010Str. 1 85748 Garching Germany"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Linus F.","family":"Huber","sequence":"additional","affiliation":[{"name":"Chair for Functional Materials Department of Physics TUM School of Natural Sciences Technical University of Munich  James\u2010Franck\u2010Str. 1 85748 Garching Germany"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Lucas P.","family":"Kreuzer","sequence":"additional","affiliation":[{"name":"Heinz Maier\u2010Leibnitz Zentrum (MLZ) Technical University of Munich  Lichtenbergstr. 1 85748 Garching Germany"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Suzhe","family":"Liang","sequence":"additional","affiliation":[{"name":"Chair for Functional Materials Department of Physics TUM School of Natural Sciences Technical University of Munich  James\u2010Franck\u2010Str. 1 85748 Garching Germany"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Robert","family":"Cubitt","sequence":"additional","affiliation":[{"name":"Institut\u2010Laue\u2010Langevin  6 rue Jules Horowitz 38000 Grenoble France"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Ya\u2010Jun","family":"Cheng","sequence":"additional","affiliation":[{"name":"Ningbo Institute of Materials Technology &amp; Engineering Chinese Academy of Sciences  1219 Zhongguan West Rd. 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