Abstract: The surface properties of hydrolytic surfactants,sodium alkycarboxylate and alkylammonium chlorides,were investigated systematically.lt is found that the variation of pH,salt and temperature have obvious influence on the surface properties and micellization of the system.Due to hydrolysis of the surfactants,the systems have high surface activity.It is interesting to note that the variation of pH still has an obvious influence on the surface properties of sodium alkycarboxylate at pH ≥ 9.2.In contrast,the surface properties and micellization of alkylammonium chlorides are mainly affected by adding salt rather than pH at pH ≤ 6.06,indicating the different hydrolysate effect in these two kinds of surfactant systems.The standard thermodynamic parameters of micellzation have been calculated according to the model of charged pseudophased separation,and the effect of temperature on hydrolytic surfactants has also been studied.

Key words: Hydrolytic surfactant, Sodium alkycarboxylate, Alkylammonium chloride, 　Surface Property, Thermodynamic parameters of micellization