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以十二胺、1,6-二溴己烷和1,3-丙磺酸内酯为主要原料,分别采用极性头基加入法和联结基加入法,合成了一种磺酸盐型双子表面活性剂1,6-双(N-十二烷基-N-丙基磺酸钠)-己烷〔简称12-6-12(SO_3)_2〕。用1HNMR和ESI-MS表征了中间体和产物的结构,并考察了12-6-12(SO_3)_2的表面活性。结果表明:该表面活性剂水溶液在30℃下,临界胶束浓度(CMC)为0.015 mmol/L、表面张力为33.50 m N/m、表面过剩吸附量(Γmax)为2.78×10-6mol/m2、分子最小截面积(Amin)为0.60 nm2。该磺酸盐双子表面活性剂的CMC是结构相似的传统单链表面活性剂十二烷基磺酸钠(SDS)CMC(25℃,8.0 mmol/L)的0.2%,是结构相似的磺酸盐双子表面活性剂1,3-双(N-十二烷基-N-丙基磺酸钠)-丙烷(12-3-12(SO_3)_2)CMC(25℃,0.048 mmol/L)的31%。
With dodecylamine, 1,6-dibromohexane and 1,3-propane sultone as the main raw materials, the polar head group addition method and the coupling group addition method were respectively used to synthesize a sulfonate-type gemini The surfactant 1,6-bis (N-dodecyl-N-propylsulfonate) -hexane [abbreviation 12-6-12 (SO_3) _2]. The structures of intermediates and products were characterized by 1HNMR and ESI-MS, and the surface activity of 12-6-12 (SO_3) _2 was investigated. The results showed that the surfactant had a critical micelle concentration (CMC) of 0.015 mmol / L at 30 ℃, a surface tension of 33.50 m N / m and an excess surface adsorption capacity (Γmax) of 2.78 × 10-6 mol / m2 , The smallest molecular cross-sectional area (Amin) of 0.60 nm2. The CMC of the sulfonate gemini surfactant is a structurally similar 0.2% of the conventional single-chain surfactant sodium dodecyl sulfate (SDS) CMC (25 ° C, 8.0 mmol / L) and is a structurally similar sulfonic acid Salt gemini surfactant (12-3-12 (SO 3) 2) CMC (25 ° C, 0.048 mmol / L) 31%.