十二烷基酰胺丙基磷酸酯甜菜碱的复配性能研究

Study on the compounding properties of dodecylamidopropyl phosphobetaine

在298 K,0.1 mol/L NaCl水溶液中,分别研究了十二烷基酰胺丙基磷酸甜菜碱(C12-APA)/十二烷基硫酸钠(SDS)和十二烷基酰胺丙基磷酸甜菜碱(C12-APA)/脂肪醇聚氧乙烯醚9(AEO9)混合表面活性剂体系在不同摩尔比下的表面化学性质,通过常规溶液理论计算了混合体系的协同作用参数。结果表明,SDS/C12-APA混合体系具有比单一表面活性剂更好的表面活性,当摩尔比n(SDS)/n(C12-APA+SDS)为0.5时,混合物的协同作用最强;由SDS/C12-APA和AEO9/C12-APA复配体系的微极性和胶束聚集数,可简单判定SDS/C12-APA复配体系具有协同效应,而AEO9和C12-APA形成的混合体系没有协同效应,并且混合体系形成了比原来更小更稳定的胶束结构。

Surface chemical properties of the dodecylamidopropyl phosphobetaine(C12-APA)/sodium dodecyl sulfate(SDS)and dodecylamidopropyl phosphobetaine(C12-APA)/fatty alcohol polyoxyethylene ether 9(AEO9)binary mixed surfactant systems along with different proportions were investigated in 0.1 mol/L NaCl at 298 K.Synergistic parameters of the mixtures were also calculated by the regular solution theory.Results indicated that the SDS/C12-APA mixed systems possessed better surface activity than that of individual surfactants.When the ratio n(SDS)/n(C12-APA+SDS)was 0.5,the synergisms of the mixtures was the strongest;Moreover,the micropolarity and micelle aggregation number of SDS/C12-APA and AEO9/C12-APA complex systems were studied.The obtained results could simply determine that the SDS/C12-APA compound system had a synergistic effect,while the mixed system formed by AEO9 and C12-APA had no synergistic effect,and the mixed system formed smaller and more stable micelle structure than the original.