连接基长度对琥珀酸酯磺酸盐型双子表面活性剂水溶液动态表面张力及吸附动力学的影响

Effect of the length of the linker on dynamic surface tension and adsorption kinetics of succinate sulfonate Gemini surfactant in aqueous solution

用最大泡压法测定了磺酸盐型双子表面活性剂乙二醇双子琥珀酸二仲辛酯磺酸钠(GSS271)、1,3-丙二醇双子琥珀酸二仲辛酯磺酸钠(GSS371)与1,4-丁二醇双子琥珀酸二仲辛酯磺酸钠(GSS471)在不同浓度下的动态表面张力(DST),详细表征了DST随时间的变化过程,研究了连接基对DST的影响,利用Rosen模型得出DST的n、t*、ti、tm和R1/2,用Ward-Tordai方程对吸附机理进行探讨。结果表明,连接基越短,GSS表面活性剂的动态表面活性越好;当浓度c<cmc时,GSS表面活性剂在吸附初期为纯扩散控制,吸附后期为混合动力扩散控制。

The dynamic surface tensions of ethanediol bis-secoctyl sulfo succinate(GSS271),1,3-propanediol bis-secoctyl sulfo succinate(GSS371)and 1,4-butanediol bis-secoctyl sulfo succinate(GSS471)aqueous solutions with different concentration were investigated using the maximum bubble pressure method.The process of DST changing with time was described in detail and the influence of connecting group on DST was studied.The n,t^*,ti,tm and R1/2 of DST were obtained by Rosen model.Meanwhile,the adsorption mechanism was discussed by Ward-Tordai equation.The results showed that the shorter the connection group,the better the dynamic surface activity of GSS surfactant.When c<cmc,the GSS surfactants were controlled by pure diffusion at the initial stage of adsorption,and were hybrid diffusion-kinetics control at the later stage of adsorption.