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枝状Gemini咪唑表面活性剂的合成、表征及性能
The synthesis,characterization and properties of branched Gemini imidazolium surfactants
【摘要】 为研究枝状连接基对Gemini咪唑表面活性剂性能的影响,以2,2-双(溴甲基)-1,3-丙二醇为连接基合成枝状的Gemini咪唑表面活性剂2,4-二(溴化-3-烷基咪唑)-1,3-丙二醇([Cn-P-Cn]Br2),其中n=10,12,14.通过表面张力法和电导法测量其表面活性并计算25℃时胶束形成的各项性能参数:临界胶束浓度(ccmc)、表面饱和吸附量(Γcmc)、表面活性剂分子在空气/水界面的最小横截面积(Amin)、效率因子(pC20)和表面压(πcmc)等.结果表明,不同链长的3种表面活性剂具有很高的表面活性,所有表面活性剂胶束形成的吉布斯自由能(ΔGm)均为负值,说明常温常压下胶束的形成是自发过程.
【Abstract】 To study the effect of branched spacer on the property of Gemini imidazolium surfactants,Gemini imidazolium surfactants of 2,4-[bis(3-alkylimidazolium-1-yl) bromide]-1,3-propanediol([Cn-P-Cn]Br2,where n is the hydrocarbon chain length of 10,12 or 14) were synthesized with 2,2-dibromomethyl-1,3-propanediol as the spacer.Their surface activity and thermodynamic properties of micellization were characterized by surface tension and electrical conductivity measurements.The values of critical micelle concentration(ccmc),saturation adsorption values at the air/aqueous interface(Γmax),the area per surfactant molecule at the air/aqueous interface(Amin),the efficiency of adsorption(pC20) and surface pressure(πcmc) derived from surface tension measurement at 25 ℃ suggested that the surface activity of [Cn-P-Cn]Br2 was high.While Gibbs Free Energy of micellization(ΔGm) of all the surfactants derived from electrical conductivity were all negative,indicating that the formation of micelles was spontaneous.
【Key words】 Gemini imidazolium surfactants; surface tension; electrical conductivity measurements; degree of counterion binding to micelles; thermodynamics of micelle formation;
- 【文献出处】 哈尔滨工业大学学报 ,Journal of Harbin Institute of Technology , 编辑部邮箱 ,2012年12期
- 【分类号】O647.2
- 【被引频次】2
- 【下载频次】170