Specific Interactions in Ternary System Quaternized Polysulfone/Mixed Solvent

Theoretical and experimental aspects on the specific interactions developed via electrostatic interactions and hydrogen-bonding in a ternary system formed of a proton-donor solvent (N,N-dimethylformamide or methanol), a proton-acceptor solvent (water), and a quaternized polysulfone with various contents of ionic chlorine, which indicates a proton-acceptor character, are investigated. Thus, the interactions of the ternary systems are corrected on the basis of the association phenomena defined through association constants. Numerical values for these constants were evaluated as a function of the system composition, by mathematical simulations for an accurate adjustment of preferential adsorption, determined by the Flory-Huggins-Pouchly theoretical approach applied to the experimental data. POLYM. ENG. SCI., 49:17-25, 2009. (C) 2008 Society of Plastics Engineers