表面活性剂EQ-M与SDBS的协同效应研究

Study on the Synergism between Cationic Surfactants EQ-M with SDBS

评价了阳离子型表面活性剂溴化-N-十六烷基-3-吡啶甲酸甲酯和溴化-N-十六烷基-3-吡啶甲酸乙二醇单酯(代号EQ-M)与普通阴离子表面活性剂十二烷基苯磺酸钠(SDBS)之间的协同效应,考察了复配比例对体系表面张力和临界胶束浓度的影响.实验结果表明:EQ-M型阳离子型表面活性剂与阴离子表面活性剂SDBS之间有强的相互作用,当EQ-M与SDBS的比例为1∶1时,二者的协调效应最强;EQ16-CH3与SDBS复配体系的cm c降低了一个数量级,EQ16-OH与SDBS复配后cm c降低了2个数量级;γcm c也有略有下降.结果还表明,头基的结构对协同效应有较大的影响,含有极性头基(羟基)的EQ16-OH与SDBS的协同效应更强,可能的原因是二者之间可以形成氢键,从而导致阴,阳离子表面活性剂之间更加紧密的排列.

The synergic effect between cationic surfactants EQ-M and sodium dodecyl benzoic sulfate（SDBS） has been studied,and the effect of the ratio of EQ-M/SDBS on the surface tension and critical micellar concentration（cmc） of the mixture has been investigated.The results showed that there was strong interaction between EQ-M and SDBS.the strongest synergic effect appeared at a ratio of 1：1 between EQ-M and SDBS,The cmc of mixture system（EQ16-CH3/SDBS） reduced by an order of magnitude,and that of EQ16-OH/SDBS by two orders of magnitude.The influence of head group on the synergy effect was examined.The synergism between EQ16-OH bearing polar head group（OH group） and SDBS was stronger.It may be caused by the formation of hydrogen bond between the two surfactants,which led to closer arrangement of molecules.