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    Robust Ion-Permselective Multilayer Films Prepared by Photolysis of Polyelectrolyte Multilayers Containing Photo-Cross-Linkable and Photolabile Groups

    Year: 2006

    Journal: Langmuir, 2006, 22 (18), pp 7894–7901, 20111221

    Authors: En-Hua Kang, Xiaokong Liu, Junqi Sun, and Jiacong Shen

    Organizations: Key Lab of Supramolecular Structure and Materials, College of Chemistry, Jilin University, Changchun, P. R. China 130012

    The azobenzene-containing polyanion PAC-azoBNS was alternately assembled with the polycation diazoresin (DAR) to construct photo-cross-linkable multilayer films of PAC-azoBNS/DAR that contain photolabile groups of azobenzene. Upon mild UV irradiation, the interaction between PAC-azoBNS/DAR multilayers was converted from electrostatic interaction to covalent bonds. Because of the free carboxylic acid groups presented in the film, the photo-cross-linked multilayer film favors the selective permeation of positively charged species. After photolysis of the photo-cross-linked PAC-azoBNS/DAR films with intense UV irradiation, azobenzene groups decompose to produce imine groups, and a photo-cross-linked robust film containing free carboxylic acid and imine groups was fabricated. The resultant film allows the permeation of negatively charged species and meanwhile shows a pH-switchable permselectivity for positively charged species. Because of the covalently cross-linking structure, the photolyzed cross-linked PAC-azoBNS/DAR film shows high reversible switching behavior and has high stability in solution with high ionic strength.