双直链烷基二苯甲烷双磺酸盐的合成与性能

以二苯甲烷、系列长链脂肪酰氯(月桂酰氯、豆蔻酰氯、棕榈酰氯)和氯磺酸为主要原料,合成了3个阴离子双子表面活性剂———双直链烷基二苯甲烷双磺酸钠盐(DSDM)。通过硅胶层析法分离提纯了中间产品,并采用核磁共振氢谱对其结构进行表征,采用质谱对最终产品的结构进行了表征,证明所得产物即为目标产物。测定了DSDM的相关性能,结果表明,C12-DSDM在25℃时,CMC和γCMC分别为1.452 mmol/L和38.49 mN/m;C14-DSDM、C16-DSDM的油水界面张力均受温度和硬度的影响;C14-DSDM不受盐度的影响;C16-DSDM受盐度影响较大;C14-DSDM、C16-DSDM复配体系可达到9.44×10-3 mN/m的超低界面张力。

Synthesis And Properties Of Di-linear Alkylated

Di-linear alkylated diphenylmethane sulfonate(DSDM) is a series of new-style anionic gemini surfactants,which have been synthesized from the raw materials of diphenylmethane,lauryl chloride,myristyl chloride,palmitoyl chloride and chlorosulfonic acid,and the intermediates of which have been separated and purified by silica gel chromatography.The structure of the intermediates was characterized by means of 1HNMR and the structure of the final product was characterized by means of MS.The surface tension and oil/water interfacial tension have been measured.The results indicate that the CMC and γCMC are respectively 1.452 mmol/L and 38.49 mN/m at 25 ℃.The interfacial tension of C14-DSDM、C16-DSDM is affected by the temperature and hardness of water.The interfacial tension of C14-DSDM is not affected by salinity,but the interfacial tension of C16-DSDM is affected significantly by salinity.The mixed surfactant exhibits an ultra-low interfacial tension of 9.44×10-3 mN/m.