【摘要】 以对二氯苄（XDC）和十二烷基二甲基叔胺为原料,合成了阳离子双子表面活性剂N,N’-对苯二亚甲基-双（十二烷基二甲基氯化铵）（XBDDMA）。产物结构经红外光谱（FT-IR）、核磁共振氢谱（¹H NMR）和碳谱(¹³C NMR)进行了确认。研究了XBDDMA与脂肪醇聚氧乙烯（9）醚（AEO₉）按不同摩尔比复配所得体系的临界胶束浓度（cmc）、平衡表面张力(γ_cmc)及动态表面张力。结果表明,当n（XBDDMA）∶n（AEO₉）=1∶9⁹∶1时,随XBDDMA含量增加,复配体系的cmc先降低后升高,表面活性剂分子在表面上的极限占有面积(A_min)持续降低,当n（XBDDMA）∶n（AEO₉）=1∶1时复配体系的cmc最小,为2.27×10^-6mol/L,γ_cmc也最小,为33.06 m N/m;XBDDMA的添加降低了吸附初期的扩散能,从而降低了AEO₉的动态表面活性,二者复配不具有动态表面活性的协同增效作用。更多还原

【Abstract】 Cationic Gemini surfactants N,N’- p- xylylene- bis-（ dodecyldimethylammonium chloride）（ XBDDMA） were synthesized by 1,4- bis-（ chloromethyl）- benzene（ XDC） and dimethyldodecylamine.The chemical structure of the purified product was confirmed by FT- IR,¹H NMR and （13） C NMR. The XBDDMA and AEO₉ were blended with different molar ratio,as well as the critical micellar concentration（ cmc）,equilibrium surface tension( γ_cmc) and dynamic surface tension of the blend system were studied. The results showed that as n（ XBDDMA） ∶ n（ AEO₉） is at the range of 1∶ 9- 9∶ 1,following the increase of content of XBDDMA,the cmc of the blend system decreases firstly and then increases,while the area occupied by the surfactant( A_min) decreases continuously. When n（ XBDDMA） ∶ n（ AEO₉） = 1∶ 1,the cmc of the blend system is the smallest,which is 2. 27 × 10^{- 6}mol / L,and the γcmcis 33. 06 m N / m,which is also the smallest. The addition of XBDDMA reduces the initial diffusion energy,which reduces the dynamic surface activity of AEO₉,and there is no synergism effect on the dynamic surface activity between XBDDMA and AEO₉.更多还原