MMA反相微乳液体系的稳定性及相结构表征

摘要

采用电导率法,测定了以表面活性剂丁二酸-2-乙基己基磺酸钠（AOT）与甲基丙烯酸甲酯（MMA）和水构成的反相微乳液体系的稳定性,考察了油相极性、表面活性剂浓度、分散相浓度及离子价态、助乳化剂丙烯酰胺（AM）对反相微乳液体系的影响,确定了反相微乳液体系体系的局部相图,初步表征了反相微乳液体系的相结构。结果表明,以极性单体作为油相的微乳液体系电导率与增溶水量的变化关系中不存在突变点,有别于一般的以低极性或非极性烷烃（或混合烷烃）作为油相的微乳液体系。当体系中AOT浓度0.1~0.3 M,分散相（盐溶液）浓度≤0.05 M,增溶水量（[H2O]/[AOT]摩尔比）w≤9时,可以得到稳定的反相微乳液体系,AM的存在能够增大体系的增溶能力。%Methyl methacrylate（MMA） microemulsion stability was analysed through the measurement of conductivity.The effect of polarity of the oil phase,the concentration of di（2-ethylhexyl）sulfosuccinate（AOT）,the concentration and the valence state of the disperse phase and AM on the reverse microemulsion system were researched.The local phase diagram of AOT/MMA/NaCl solution was determined.The phase structure of the reverse microemulcion was characterized.The results indicate that,MMA microemulsion system has no conductivity critical point during the variation of w,which was very different from the other microemulsion system in which alkane was used as oil phase.The stable reverse microemulsion system could be obtained in the case of CAOT=0.1~0.3 M,Csalt≤0.05 M and w（water-to-surfactant mole ratio）≤9.AM could increase the volume of water solubilized in the system.