Synthesis and Properties of Organosilicon Quaternary Salts Surfactants

Diethyl‐benzyl‐[3‐methyldimethoxyl)]silpropyl ammonium chloride (DEBSAC) was synthesized from N , N ‐diethyl‐aminopropyl‐methyldimethoxysilane (DEAPMDES) and benzyl chloride. Diethyl‐2,3‐epoxypropyl‐[3‐methyldimethoxyl)] silpropyl ammonium chloride (DEEPSAC) was synthesized from DEAPMDES and epoxy chloropropane. Trimethyl‐[3‐methyldimethoxyl)] silpropyl ammonium chloride (TMSAC) was synthesized from trimethylamine and γ‐chloropropylmethyldimethoxysilane (CPMDMS). The products were characterized by 1 H NMR, 13 C NMR, and IR. The surface tension measurements showed that the organosilicon quaternary salts exhibit a lower surface tension and a lower critical micelle concentration (CMC) than the hydrocarbon counterparts. The plate count method experiments illustrated that DEEPSAC has a better degree of antibacterial activity against Escherichia coli than DEBSAC. The solubilizing effects of the organosilicon quaternary salts on organosilicone were studied by pseudo‐ternary phase diagrams of synthesized products/cosurfactant( n ‐butanol)/water/octamethylcyclotetrasiloxane. The solubilizing activities decreased in the order of TMSAC > DEBSAC > DEEPSAC.