双十六烷基二苯醚双磺酸钠的合成与聚集行为

SYNTHESIS AND AGGREGATION BEHAVIORS OF SODIUM DISULFONATE GEMINI SURFACTANT WITH DOUBLE HEXADECYL TAILS

通过烷基化、磺化和中和反应合成了双十六烷基二苯醚双磺酸钠(C_(16)-DADS),利用电喷雾质谱对产物结构进行表征,通过电导率、荧光光谱、动态光散射以及流变性能测定分析了C_(16)-DADS的聚集行为。结果表明,C_(16)-DADS的胶束化过程是熵驱动过程,C_(16)-DADS浓度为0.8 mmol/L和2 mmol/L的胶束聚集数分别6和11,二级聚集体的粒径分别为约70 nm和约145 nm,C_(16)-DADS浓度大于60 mmol/L时出现剪切变稀现象。

Sodium bis-hexadecyl diphenyl ether disulfonate(C_(16)-DADS)was synthesized by Friedel-Crafts alkylation,sulfonation,and neutralization.The aggregation behaviors of C_(16)-DADS in aqueous solutions were investigated by electrical conductivity,steady-state fluorescence,dynamic light scattering and rheological measurements.The results show that the micellization process is primarily driven by the entropy.The average aggregation numbers of 0.8 and 2 mmol/L C_(16)-DADS solutions are 6 and 11,respectively.The aggregate diameters of 0.8 and 2 mmol/L C_(16)-DADS solutions mainly distribute at 50110 and 100210 nm,respectively.When the concentrations of C_(16)-DADS are higher than 60 mmol/L,C_(16)-DADS solutions exhibit shear thinning phenomenon.