以中碳链长有机酸 C_4H_9COOH 到 C_6H_(13)COOH 为助表面活性剂,与表面活性剂 OS(油酸钠),十二烷和水四组分构成微乳液体系.研究了有机酸分子量和体系含油量对微乳液相图影响;从相图出发得到一系列 n_a/n_s 和 n_o/n_s 数据,两者关联作图得到直线,由其斜率和截距计算出有机酸从油相转移到微乳液液滴界面相的标准热力学函数△G_(0→i)~0,△H_(0→i)~0 和△S_(0→i)~0;用计算机拟合它们与有机酸的碳链长的关系式;并对其结果作了理论探讨. The microemulsion system consisted of medium-chain organic acids C_4H_9COOH and C_6H_ (13) COOH as cosurfactants and surfactant OS (sodium oleate), dodecane and water.The effects of organic acid molecular weight and From the phase diagram, a series of n_a / n_s and n_o / n_s data are obtained, and the correlation between the two is plotted to obtain a straight line. From the slope and intercept, the organic acid is transferred from the oil phase to the micro The standard thermodynamic functions △ G_ (0 → i) ~ 0, △ H_ (0 → i) ~ 0 and △ S_ (0 → i) ~ 0 of the emulsion droplet phase interface were fitted by computer. Long relationship; and the results of a theoretical discussion.