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In this paper, monododecyl diphenyl ether disulfonate (C 12 -MADS) and didodecyl diphenyl ether disulfonate (C 12 -DADS) are Friedel-Craft reaction product of 1-dodecene and diphenyl oxide using sulfated zirconium as a catalyst, followed by sulfonation with fuming sulfuric acid in 1,2-dichloroethane and neutralization with aqueous sodium hydroxide solution. The relationship between the structures of the surfactants C 12 -DADS, C 12 -MADS and linear alkylbenzene sulfonate (C 12 -LAS) and their surface and interfacial properties was studied by measuring equilibrium surface tensions, dynamic surface tensions and dynamic interfacial tensions (IFT). The results show that the surface and interfacial activity of C 12 -MADS is better than that of C 12 -DADS and C 12 -LAS. The gemini surfactant C 12 -DADS shows most unfavorable surface and interfacial activity due to the fact that the cross-linked hydrophobic carbon chains decreases the number of exposed methyl in molecule. The dynamic surface tensions results show that the diffusion coefficients values of C 12 -MADS and C 12 -DADS are lower than that of C 12 -LAS, and the adsorption process of surfactants at air/water interface is a mixed diffusion-kinetic adsorption mechanism. The data of dynamic ITF between aqueous surfactants solutions and dodecane indicate that the NaCl and CaCl 2  concentration has a weak effect on the stable value of dynamic IFT for C 12 -DADS. With increasing the NaCl and CaCl 2  concentration, the stable values of dynamic ITF for the three surfactants mostly passes through a minimum at an optimum concentration, and the C 12 -MADS and C 12 -LAS can reduce the IFT to the 10 −2  mN/m order of magnitude.

Surface and Interfacial Properties of Mono and Didodecyl Diphenyl Ether Disulfonates