Investigation of the Influence of Salts on the Co-Nonsolvency Effect of Poly(sulfobetaine)-Based Diblock Copolymer Thin Films in Mixed Water
We will study salt-loaded thin films of a doubly thermo-responsive diblock copolymer (DBC). The DBC consists of a thermo-responsive UCST¿type zwitterionic polysulfobetaine (PSBP) block and a LCST-type nonionic poly(N-isopropylmethacrylamide) (PNIPMAM) block. To study the influence of different potassium salts on the solvation behavior in mixed water/methanol vapors, salt-loading used KCH3COOH, KCl or KI. Considering the salt-sensitive nature of the zwitterionic PSBP block and the salt solvation effect, a comprehensive mechanism of salts influencing the co-nonsolvency effect of the DBC in mixed water/methanol vapors is expected. The vapor-sensitive different film thicknesses of the DBC thin films make this DBC an excellent candidate for applications in the field of sensors, soft robotics, tissue engineering, implantable electronics, etc. By performing in situ neutron reflectometry (NR) measurements in time-of-flight (ToF) mode at D17 (time resolution of 5 s), we elucidate the solvent distribution over the swelling and exchange time and the swelling behavior of each thin film. A high neutron scattering contrast between polymer and solvents results from deuterated water and methanol.
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MUELLER BUSCHBAUM Peter; CUBITT Robert; HUBER Linus; Morgan Le Dû; REITENBACH Julija; WANG Peixi and WEGENER Simon. (2023). Investigation of the Influence of Salts on the Co-Nonsolvency Effect of Poly(sulfobetaine)-Based Diblock Copolymer Thin Films in Mixed Water. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.9-11-2093
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