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    A pH-responsive polyelectrolyte multilayer film with tunable interfacial properties

    Year: 2021

    Journal: Polymer, Volume 214, FEB 1

    Authors: Jiang, Tao; Moghaddam, Saeed Zajforoushan; Thormann, Esben

    Organizations: Independent Research Fund Denmark [6111-00102B]

    Keywords: Polyelectrolyte multilayer; Surface modification; EDC/NHS cross-Linking; pH-responsive film

    We report a facile and versatile approach to fabricate polyelectrolyte multilayer (PEM) films with a chemically modifiable outer surface. A PEM film was prepared by layer-by-layer assembly of poly (2-aminoethyl methacrylate) (PAMA) and polymethacrylic acid (PMAA), terminated with a partially tert-butyloxycarbonyl (Boc)protected random copolymer (PAMA-co-PBocAMA) as the final layer. The obtained PEM film was then cross linked and the free amino groups in the PEM film were quenched using EDC/NHS chemistry. The outer layer of the film was then treated via a deprotection reaction, affording free amino groups selectively located at the film surface. As a proof of concept study, these functional groups were used to modify the film surface with two model hydrophilic and hydrophobic compounds, which tuned the wettability of the PEM.
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