双辛酰胺乙基丁烷磺酸盐表面活性剂的合成及性能

Synthesis and Properties of bis(octylamidoethyl)-butyl sulfonate surfactant

摘要:

以辛酸，二乙烯三胺为原料，氢氧化钾作催化剂，经酰胺化反应合成了中间体N,N-双辛酰胺乙基胺,将其溶解在甲苯-丙酮中再与过量的1,4-丁烷磺内酯反应，多次提纯后得到双辛酰胺乙基丁烷磺酸盐表面活性剂。采用FT-IR、ESI-MS、1HNMR等方法对合成的中间体和目标产物进行了结构表征。使用悬滴法测试了所合成的表面活性剂在不同温度下的表面张力，结果表明，在25℃时该表面活性剂临界胶束浓度CMC为1.41×10-3 mol/L，最低表面张力γCMC为26.78 mN/m，且随着温度的升高，CMC增加，γCMC、最大吸附量Γmax下降。加入0.2 mol/L的NaCl后，CMC减小到4.20×10-4 mol/L，γCMC下降为25.51 mN/m。

Abstract:

Bis(octylamidoethyl)-butane sulfonate surfactant, was prepared from an excessive 1,4-butane sultone and intermediate N,N-bis(octylamidoethyl)-amine, which was synthesized from octanoic acid, diethylenetriamine and potassium hydroxide(as a catalyst). The chemical structures of the intermediate and the surfactant were characterized by FT-IR, ESI-MS and 1HNMR.Its surface tation in different temperature was determined by pendant drop method, the results showed that critical micelle concentration (CMC) of surfactant was 1.41 ×10-3 mol/L and the minimum surface tension(γCMC) was 26.78 mN/m at 298 K. With an increase in temperature, the CMC gradually increased, γCMC and maximum surface adsorption capacity Γmax decreased. With the addition of NaCl solution (0.2 mol/L), the CMC and γCMC reduced to 4.20×10-4 mol/L and 25.51 mN/m.