Abstract: Surface activities and application performances of dodecyltrimethylammonium hexanoate (C₁₂NC₆) and sodium dodecyl benzene sulfonate (SDBS) blend systems were measured.Results show that the critical micelle concentration and surface tension of the blend systems are lower than each single component surfactant of the system;and the rate of diffusion adsorption of the blend systems is slower than that of each single component surfactant.The foam stability and wetting power of C₁₂NC₆ are improved by the addition of SDBS.As n(C₁₂NC₆)∶n(SDBS)＝1∶1,the critical micelle concentration and surface tension of the blend system achieve the lowest value,and the blend system displays better foam stability and wetting power,but the foaming power and emulsifying power of the blend system become worse.

Key words: dodecyltrimethylammonium hexanoate, sodium dodecyl benzene sulfonate, surface activity, application performance