【摘要】 以异丙醇为溶剂,柠檬酸、十二烷基二甲基叔胺和环氧氯丙烷为原料合成了柠檬酸三酯三联季铵盐阳离子表面活性剂（CTTTA）。在反应温度85℃,反应时间12 h 条件下,产物的收率大于90%,纯度97.58%,Krafft 点<0℃。用表面张力法、稳态荧光探针法和电导法在25℃测定的产物临界胶束浓度（cmc）值分别为3.3×10^-4,3.4×10^-4和3.5×10^-4mol/L。CTTTA 与传统阳离子表面活性剂相比,有较高的表面活性。更多还原

【Abstract】 A new trimeric-type cationic surfactant,citric triesters of tridodecyl triammonium（CTTTA） was synthesized from citric acid,epoxy chloropropane and dodecyl dimethyl amine.The structure was characterized by IR spectrum,HPLC and elementary analysis.When the reaction temperature was 85 ℃,the reaction time was 12 h,above 90% yield of CTTTA was obtained,with purity of 97.58% and Krafft point<0℃.Critical micelle concentration（cmc）was determined by steady-state fluorescence probe,surface tentsion and conductivity method measurements,which gave the values of 3.3×10^-4, 3.4×10^-4 and 3.5×10^-4 mol/L in 25 ℃,respectively.The results showed that the surface properties of the new trimeric-type cationic surfactant was better than those of the conventional cationic surfac- tants.更多还原