Synthesis and Properties of Fatty Dicarboxylic Acid Diester Disulfonate Gemini Surfactant

In this paper,four types of diethylene glycol di(α-sodium sulfonate) alkyl carboxylic ester surfactants were synthesized through esterification and sulfonation reaction from the starting materials of fatty acid,diethylene glycol and chlorosulfonic acid.The structures of the products were characterized by means of IR and elemental analysis.The surface activity and self-assembly behavior of the Gemini surfactants aqueous solutions were investigated.The results show that the CMC of the Gemini surfactants is lower than that of the ordinary surfactant SDS by about 1～2 order of magnitude.With the increase of the carbon atom number of hydrophobic alkyl chains,the surfactant exhibits much higher surface activity.The results of steady-state fluorescence quenching measurement show that the aggregation number of the Gemini surfactants decreases with the increase of the carbon atom number of hydrophobic alkyl chains.