唑型双子表面活性剂的合成和性能研究

以咪唑、以咪唑,溴乙酸,溴代十四烷和二元醇为主要原料,采用三步法合成了三种新的咪唑型双子表面活性剂,简记C_(14)-n-C_(14)]Br_2。通过核磁氢谱和红外光谱对三种产物的结构进行表征,证明合成的产物为目标产物。并采用表面张力法得出三种表面活性剂的表面张力曲线,进而计算临界胶束浓度(CMC)等一系列表面性能参数,结果表明,连接基越短的咪唑型双子表面活性剂拥有更低的CMC,更高的界面活性。

Synthesis and Properties of Imidazolium-based Gemini Surfactants

Three imidazolium Gemini surfactants were synthesized by three-step method using aliphatic group as spacer, and characterized by FTIR and1H-NMR . The critical micelle concentrations (CMC) of these three surfactants were measured by both surface tension measurement and conductivity measurement. Other surface property parameters such asΠcmc ,pC20,and etc. were obtained by surface tension measurements. The results showed that the three Gemini surfactants all had higher tendency to reduce the surface tension of water and lower CMC than traditional surfactants.