Composite sulfonated cation-exchange membranes modified with polyaniline and applied to salt solution concentration by electrodialysis

Structure of perfluorinated membranes investigated by method of standard contact porosimetry

“…Perspective method of perfluorinated membrane modifying is the polymer (polyaniline, polypyrrol, polythiophene) synthesis in the membrane matrix [120][121][122][123][124][125]. The introduction of electron conducting polymers not only expands the application areas for these membranes but also increases their selectivity and thermal stability [47,[126][127][128] that especially is important for fuel cell operating at high temperature. The perfluorinated membranes can be modified both with polyaniline and metal nanoparticles [129][130][131][132][133].…”

Influence of Electric Field during the Chemical Synthesis of Polyaniline on the Surface of Heterogeneous Sulfonated Cation-Exchange Membranes on the Their Structure and Properties

“…However, the modification of heterogeneous membranes with polyaniline is no less promising, inasmuch studies reported in the literature have shown the effectiveness of using materials of this kind for separating singly and multiply charged ions during the electrodialysis of multicomponent solutions, as well as for electrodialysis concentration of electrolyte solutions [22][23][24]. This effectiveness is associated with a significant decrease in the diffusion and electroosmotic permeability of membranes due to the formation of a barrier layer of polyaniline on their surface [25,26] and to their enhanced thermal stability [27].…”

“…Oxidative polymerization of aniline is usually carried out under conditions of successive diffusion of monomer and oxidant solutions through the membrane into water [15,17,25,28] and, as a rule, is accompanied by a decrease in not only the diffusion and electroosmotic permeability of the membranes, but also their electrical conductivity. Carrying out this process under conditions of an external electric field facilitates the monomer and oxidant transport to the desired area of the membrane by not only the diffusion, but also the migration mechanism and allows the use of a lower concentration of polymerization solutions and simultaneous modification of several membranes directly during electrodialysis [26,[28][29][30][31][32].…”

Effects of mixed conductivity of nanocomposite membranes MF-4SC/PANI

“…It has been established that nanocomposites MF-4SC/PAni can be used as polymer electrolytes in fuel cells to improve their performance [7,8]. Application of these composites leads to an increase in the degree of concentration of salt solutions by electrodialysis [9] compared to the unmodified MF-4SC membrane. Also, they may act as carriers of metal catalysts such as platinum [10].…”