【摘要】 通过酯化、溴代和季铵化反应,合成了以乙氧基为联接基的酯型双子(Gemini)阳离子表面活性剂N,N′-双(二甲基十二酸乙酯基)乙醚溴化铵([C11H23COOCH2CH2N+(CH3)2CH2CH2OCH2CH2N+(CH3)2CH2CH2OOCC11H23].2Br-,Ⅱ-12-EO2)。以表面张力法和稳态荧光法考察了Ⅱ-12-EO2与十二烷基硫酸钠(SDS)复配体系在40℃时0.1 mol.L-1溴化钠水溶液中的表面化学性质和胶束化行为。得到Ⅱ-12-EO2的临界胶束浓度(cmc)为1.25×10-4mol.L-1,最低表面张力(γcmc)为28.4 mN.m-1。采用稳态荧光法以芘(Py)为荧光探针,Ⅱ-12-EO2的胶束栅栏层的微极性,较一般表面活性剂大,达到1.4,与SDS的复配体系在1.2左右;以十二烷基溴化吡啶为猝灭剂,测定体系的胶束聚集数为15。运用非理想混合表面活性剂分子相互作用理论计算出Ⅱ-12-EO2与SDS复配体系的相互作用参数(β),复配体系具有降低表面张力效率、形成胶束能力和降低表面张力能力方面的协同效应。更多还原

【Abstract】 Gemini surfactant,N,N′-bis（dimethyl ethyl dodecate）ethyl ether dibromide(([C₁₁H₂₃COOCH₂CH₂N⁺)(（CH₃）₂CH₂CH₂OCH₂CH₂N⁺（CH₃）₂CH₂CH₂OOCC₁₁H₂₃]·)2Br^-,Ⅱ-12-EO₂),was synthesized.The surface chemical properties and micelle behavier of the blend of Ⅱ-12-EO₂ and sodium dodecyl sulfate in 0.1 mol/L sodium bromide（aqueous） solution at 40 ℃ were investigated by surface tension method and by fluorescence probe method.The critical micelle concentration （cmc） was determined as 1.25×10^-4 mol/L while γ_cmc is 28.4 mN/m（0.1 mol/L NaBr）;and the micelle aggregation number（N）is 15.The micropolarity of the surfactant also was determined from the ratio of intensity of peaks（I₁/I₃）of pyrene fluorescence emission spectrum.The I₁/I₃ of Ⅱ-12-EO₂ micelle is about 1.4 which shows its（micropolarity） is larger than traditional surfactants.The micellar aggregation numbers（N）was measured using steady（fluorescence） quenching method.The interaction parameter（β）of mixed micelles was calculated by regular solution theory.The（Ⅱ-12-EO₂/SDS） blend system exhibits synergism in surface tension reduction efficiency,mixed micelle formation and（surface） tension reduction effectiveness.更多还原