摘要
为对比研究不同寡聚度的阳离子季铵盐表面活性剂与磺基两性表面活性剂之间的相互作用,合成了一种Gemini阳离子季铵盐表面活性剂Malic-2C12及一种三聚阳离子季铵盐表面活性剂Citric-3C12。通过表面张力技术,分别研究了十二烷基三甲基溴化铵(DTAB)、Malic-2C12及Citric-3C12与磺基两性表面活性剂芥酸酰胺丙基羟磺基甜菜碱(EHSB)之间的相互作用。结果表明,DTAB与EHSB的混合行为接近于理想混合。然而,Malic-2C12或Citric-3C12与EHSB混合体系的临界胶束浓度(CMC)均低于理想混合模型的CMC,表明两种表面活性剂分子在混合胶束中存在协同作用。表面活性剂分子优先进入体相聚集形成混合胶束,而在表面吸附层中的排列变得疏松,导致Malic-2C12或Citric-3C12与EHSB混合体系的表面张力(γCMC)反而高于单一表面活性剂体系。另外,结合相互作用参数结果,发现随着阳离子表面活性剂的寡聚度由1(DTAB)增加至2(Malic-2C12)再到3(Citric-3C12),其与EHSB之间的协同作用逐渐增强,存在协同作用的比例区间逐渐增大,但寡聚度逐级增加所带来的增效逐渐放缓。
In order to study the interaction between the cationic quaternary ammonium surfactant of different oligomeric degrees and the sulfonetaine surfactant,a Gemini cationic quaternary ammonium surfactant Malic-2 C12 and a trimeric cationic quaternary ammounium surfactant Citric-3 C12 were synthesized. The interation of dodecyltrimethylammonium bromide( DTAB),Malic-2 C12,and Citric-3 C12 with sulfobetaine surfactant erucamidopropyl hydroxysultaine( EHSB) was studied respectively by surface tension. The results show that the mixed behavior of DTAB and EHSB exhibits only very small deviations of ideal behavior. However,the critical micelle concentration( CMC) of the mixed systems of Malic-2 C12 or Citric-3 C12 with EHSB becomes lower than the CMC of ideal model,suggesting the presence of synergystic interation between surfactant molecules in the mixed micelle. However,surfactant molecules are more likely to form mixed micelles in the bulk solution of the mixed systems of Malic-2 C12 or Citric-3 C12 with EHSB,and the surfactant molecules are loosely packed in the mixed monolayer,resulting in the higher γCMCof the mixed systems than the γCMCof the single surfactant. Meanwhile,the results of the interaction parameters show that the synergystic interaction gradually becomes stronger as the oligomeric degree of the cationic surfactant increases from 1( DTAB) to 2( Malic-2 C12) and then to 3( Citric-3 C12),and the synergistic molar ratio region gradually becomes larger at the same time. However,the extent of the increasement of the synergistic interaction between cationic surfactant and EHSB becomes smaller as the increasement of the oligomeric degree of the cationci surfactant.
引文
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