Gemini表面活性剂的合成及性能

Synthesis and Properties of Gemini Surfactants

以二苯乙烷和长碳链脂肪酰氯为原料合成出Gemini磺酸表面活性剂,通过核磁氢谱和红外光谱对化合物的结构进行表征,测定了其水溶液的表面张力,得出其表面张力曲线,进而算出其他相关参数.3种Gemini表面活性剂的临界胶束浓度(CMC)值随烷基疏水碳链的增长而降低.与线性十二烷基苯磺酸钠(SDBS)相比,Gemini表面活性剂G12-2-12的C20值降低94.4%,CMC值降低91.3%.G12-2-12的饱和吸附面积(Amin)比对应单基表面活性剂的2倍降低27%,且Gemini表面活性剂在气液界面上排列更加紧密.

A series of sulfonic-acid type Gemini surfactants were synthesized from 1,2-diphenylethane and long-chain aliphatic acyl chloride.Products obtained were characterized by 1H NMR and FT-IR;surface tension curve and related parameters were acquired by surface tension measurements.Results showed that the critical micelle concentra-tion(CMC) decreased with the increasing hydrophobic chain length.Compared with the corresponding linear sodium dodecy1 benzene sulfonate(SDBS),the C20 and CMC of Gemini surfactant G12-2-12 decreased by 94.4% and 91.3%,respectively.The area occupied by the surfactant molecule at the air/water interface(Amin)of G12-2-12 was 27%,less than two times that of SDBS,which suggested that Gemini surfactants packed more closely.