阴离子与非离子表面活性剂混合体系的胶束性质

为了研究化学驱中表面活性剂复配体系的混合胶束性质，给表面活性剂复配体系的色谱分离预测提供必要的参数，测定了十二烷基苯磺酸钠(SDBS)和TX-100混合体系的表面张力，考察了电解质浓度、种类和温度对混合体系临界胶束浓度(cmc)和相互作用参数的影响。测试结果表明，混合表面活性剂的表面张力最低值介于两种表面活性剂之间。在相同表面张力下，混合表面活性剂的浓度比单一表面活性剂浓度低，说明SDBS与TX-100混合体系的表面活性剂在降低表面张力效率方面能够产生协同效应。在无机电解质浓度远大于表面活性剂浓度时，SDBS／TX-100混合表面活性剂临界胶束浓度可用规则溶液理论来描述，但测试中的温度、电解质浓度和种类的变化对该体系相互作用参数均产生影响，说明规则溶液理论有一定局限性。图5参16

Micellar properties of mixed anionic surfactants

On the purpose of studying the property of the micelle of mixed surfactants in chemical flooding and applying data for the prediction of chromatography of the mixed surfactants, the surface tensions of sodium dodecyl benzene sulfonate (SDBS) and tolyoxyethylene (9.5) t-octylthenol (TX-100) were measured. The effect of the temperature, concentration and type of inorganic electrolyte on the critical micelle concentration (cmc) and the interreaction parameter of the mixed surfactants were investigated. Experiment shows that the minimum surface tension value of the mixed surfactants solution lies between that of both the pure surfactants. At a same surface tension value, the concentration of the mixed surfactants of SDBS/TX-100 was lower than that of pure surfactant, suggesting that it has synergism in surface tension reduction efficiency. The results show that the mixed micelle formation property of the SDBS/TX-100 could be described by the regular solution theory (RST) in higher concentration of inorganic electrolyte. The relative reaction parameters could be influenced by the change of temperature, concentration and type of the inorganic electrolyte, and, the RST is not perfect.