Volkov V.I.,RAS Semenov Institute of Chemical Physics |
Pavlov A.A.,RAS Semenov Institute of Chemical Physics |
Fedotov Yu.A.,Scientific Technical Center Vladipor |
Marinin A.A.,RAS Semenov Institute of Chemical Physics
Russian Journal of Physical Chemistry A | Year: 2010
Aromatic copolyamides based on diamino sulfoacids, unsubstituted aromatic diamines, and phthalyl dichlorides were synthesized. Self-diffusion of water and alkaline cations in aqueous Li+, Na+, and Cs+ salts of the iso-polymer (μPA) and Li+ salt of the tere-polymer (πPA) of aromatic bisulfur-containing polyamides was studied by NMR with a magnetic field pulse gradient. A supramolecular structure was formed by hydrogen bonding between the carbonyl and N-H groups of adjacent macromolecules with two water molecules included in them as structure-forming bridges. The oversorbed water was incorporated in the ionogen channels formed by the sulfo groups, counterions, and water molecules. The conclusion was drawn that the structure of ionogen channels was more regular in πPA than μPA. The self-diffusion coefficients of metal cations increase in the series Li < Na < Cs. © 2010 Pleiades Publishing, Ltd.