一些二元阴/阳离子表面活性剂混合体系的混合胶束形成和表面张力降低的效能

研究了十二醇聚氧乙烯醚硫酸三乙醇铵分别与十二烷基三甲基溴化铵、十二烷基吡啶氯化物、十六烷基三甲基溴化铵以及十六烷基吡啶氯化物的二元混合体系的混合胶束形成和表面张力降低的效能（γcme）。混合胶束形成可用Rubingh的非理想混合胶束理论来描述。由华西苑、Rosen和朱瑶导出的有关二元混合体系在γcmc方面产生协同效应的两个条件可以从所建立的二元混合体系的表面张力方程得到并且是等价的。对二元阴／阳离子表面活性剂混合体系，随着烷基链长的增加，混合胶束中的相互作用参数βM较混合单层中的相互作用参数βS下降更快，从而将失去γcmc方面的协同效应；阴离子表面活性剂分子中EO基团的存在一定程度上抑制了混合体系的沉淀或凝聚作用．

The mixed micelle formation and surface tension reduction effectiveness are studied for binary surfactant systems of triethanolammonium dodecylpolyoxyethylenesulfate with dodecyltrimehylammonium bromide,hexadecyltrimethylammonium bromide,dodecylpyridinium chloride,and hexadecylpyridinium chloride, respectively. The mixed micelle formation can be well predicted by RUBINGH's nonideal mixed micelle theory. The two conditions for sgnergismin surface tension reduction effectiveness first derived by HUA and ROSEN and ZHU can be derived from the surfacetension equations established for binary surfactant systems and are equivalent. With the increase of surfactant alkyl chainlength, βM, the interaction parameter in mixed micelle,decreases faster than βS,that in mixed monolayer,and thesurfacgism in surface tension reduction effectiveness could be lost. The presence of EO group in the molecule of anionicsurfactant inhibits,to a certain extent,the precipitation or coacervation of binary anionic/cationic surfactant systems.