Surface properties and thermodynamic properties of micellization of mono- and di-tetrapropylene diphenyl ether disulfonates

Mono-tetrapropylene diphenyl ether disulfonate (C12-MADS) and Di-tetrapropylene diphenyl ether disulfonate (C12-DADS) were synthesized via three steps reactions: Friedel-Crafts alkylation, sulfonation and neutralization. The surface properties and thermodynamic properties of micellization of tetrapropylene benzene sulfonate (C12-BAS), C12-MADS and C12-DADS were investigated by equilibrium surface tension, dynamic surface tension and electrical conductivity measurement. The result of surface tension shows that surface activity of gemini surfactant C12-DADS is better than that of C12-BAS and C12-MADS. The dynamic surface tension data show that the diffusion coefficients values of C12-MADS and C12-DADS are lower than that of C12-BAS, and the adsorption process of surfactants at air/water interface is a mixed diffusion-kinetic adsorption mechanism. In addition, the electrical conductivity result indicates that the C12-DADS more readily form micelles than other two.