不对称Gemini表面活性剂与SDS的复配研究

STUDY OF MIXTING EFFECT OF HETEROGEMINI SURFACTANT AND SODIUM DODECYL SULFATE

以三聚氯氰、二正辛胺、牛磺酸、乙醇胺为原料,合成一种阴-非离子不对称Gemini表面活性剂(HG-8),并利用ESI-MS、1 H NMR、元素分析对其结构进行了表征。采用Wilhelmy吊片法测定了HG-8、十二烷基硫酸钠(SDS,一种传统阴离子表面活性剂)以及两者的复配体系在30℃下的表面张力,探索并比较单一组分与复配体系的表面性能。结果表明:HG-8降低表面张力的效率和降低表面张力的能力优于SDS,而两者复配体系又优于任一单一组分,表现出强烈的协同效应。当HG-8的摩尔分数大于0.3时,复配体系在形成胶束能力方面存在协同效应。当α=0.9时,复配体系的临界胶束浓度和临界表面张力分别为5.11×10-5 mol/L和26.83mN/m。

An anionic-nonionic heterogemini surfactant（HG-8）was synthesized from cyanuric chloride,dioctylamin,taurine and ethanolamine.Its structure was characterized by ESI-MS,^1H NMR and elemental analysis.Wilhelmy Hanging Plate Method was used to test surface tension of HG-8,Sodium dodecyl sulfate（SDS,a traditional anionic surfactant）and their mixed system at 30 ℃.The surface properties of each component as well as the mixed system were investigated and compared.Results showed that the ability and efficiency of reducing surface tension of HG-8 were better than which of SDS,while the mixed system was better than any of the component and exhibit strong synergistic effect.When the mole fraction of HG-8 outstripped 0.3,the mixed system showed synergism in micelle formation ability and whenα=0.9,the critical micelle concentration（CMC）and the critical surface tension of the mixed system were 5.11×10^-5 mol/L and 26.83mN/m,respectively.