联结基对磺酸盐型双子表面活性剂的界面张力和起泡性能的影响

 合成了一系列具有支状疏水链的新型磺酸盐型双子表面活性剂D₂C_n（D为疏水基仲辛基，C为联结基中亚甲基，n=2，4，6，8），考察了联结基对其表面活性的影响。结果表明，D₂C_n系列双子表面活性剂溶液的临界表面张力γ_CMC与临界胶束浓度CMC值均随联结基长度的增加而增大；辽河原油加入D₂C_n系列双子表面活性剂溶液后的油-水界面张力随着联结基团长度的增加先增加后降低。D₂C_n系列双子表面活性剂具有良好的泡沫性能，随着联结基长度的增加，初始起泡体积降低，泡沫半衰期先增加后降低；随着温度的增加，泡沫半衰期显著下降，初始起泡体积先增加后降低。

The Effect of Spacer on Interfacial Tension and Foam Properties of Sulfonate Gemini Surfactants

A new series of Gemini surfactants D₂C_n（D represents hydrophobic group sec-octyl phenol，C represents methylene in spacer groups，n=2，4，6，8）with branched carbon-hydrogen chains and different spacer groups were synthesized, and the effects of the spacer group on the surface properties of D₂C_n were investigated. The results showed that critical surface tension (γ_CMC) and critical micelle concentration (CMC) of D₂C_n solution increased upon increasing spacer length. The oil-water interfacial tensions of Liaohe crude oil with D₂C_n added were measured, which presented the trend of first increase and then decrease with the increase of spacer group length in D₂C_n. The series of D₂C_n have excellent foam properties. Foaming volume decreased and half foam life period first increased and then decreased with the increase of spacer length in D₂C_n.With temperature rising, half foam life period of D₂C_n decreased significantly and foaming volume increased to a peak value then decreased.