双头基表面活性剂的合成、表征及其性能

Synthesis,characterizations and properties of a twin-head surfactant

以棕榈酸、四甲基二丙烯三胺和丙烷磺内酯为主要原料合成了一种双头基表面活性剂N,N-双[3-(二甲基磺丙基铵基)-丙基]-N-十六酰胺,红外光谱和质谱分析验证了产物的结构。对产物进行性能测试,结果表明:25℃时,临界胶束浓度cmc为1.78×10-4mol/L,γcmc为50.1mN/m;在浓度大于cmc时,硝基苯在产物胶束相的分配系数lgKmc=3.12;钙皂分散指数LSDR为4%;硬水中的稳定等级为5级。

A novel twin-head surfactant , N,N-bis[3-（dimethylsulfopropylammonio）-propyl）] palmitylamide,was synthesized using palmitic acid,tetramethyldipropylenetriamine and 1,3-propane sultone as starting materials. The structure of this sulfobetaine surfactant was confirmed by FT-IR and ESI-MS spectrum,and surface chemical properties of the product were measured. The lowest surface tension was 50.1mN/m,and critical micelle concentration was 1.78＆#215;10-4mol/L at 25℃. At the concentration was greater than cmc,the distribution coefficient of nitrobenzene in this product micellar phase lgKmc was 3.12;calcium soap dispersing index LSDR of this surfactant was 4%;stability level of resistance to hard water of this surfactant was 5.