双子两性磷酸酯/十二烷基硫酸钠复配体系的表面活性

Surface activity of a mixed system of gemini zwitterionic phosphate surfactant and sodium dodecyl sulphate surfactant

研究了阴离子表面活性剂十二烷基硫酸钠(SDS)和双子两性磷酸酯表面活性剂(C12GP)的形成胶束能力和降低表面张力能力的协同作用,发现C12GP与SDS摩尔比为4∶1时增效作用显著.考察了无机盐、醇对复配体系表面活性的影响.结果表明:加盐能够提高表面活性;短链脂肪醇作为添加剂应用于复配体系后,当混合表面活性剂的浓度较低时,其临界胶束浓度(ccm)比直接使用混合表面活性剂的ccm有所下降;同时长链脂肪醇作为添加剂应用于复配体系后,其ccm比直接使用混合表面活性剂的ccm下降显著.

The ability of forming micelle as well as the ability of reducing surface tension by the interaction of gemini zwitterionic phosphate surfactant （C12 GP） and anionic surfactant （SDS） has been investigated. Results demonstrate that when the molar fraction of C12GP is about 80% , the mixed system shows best properties for reducing surface tension. Influence of NaCl and alcohols on surface properties of the mixed system has also been studied. Experimental results indicate that the surface activity is enhanced with the addition of NaCl. Critical micelle concentration （ccm） of the mixed system decreases with the increasing of the carbon chain of short chain alcohols when the concentration of short chain alcohols is in a low degree. Moreover, long chain alcohols can significantly reduce ccm of the mixed system in comparison with the system without additives.