【摘要】 以月桂酸聚氧乙烯和聚乙二醇二油酸酯为乳化剂,以油酸酯为油相,制备了不同乳化剂配比和不同油相含量的微乳液,研究了乳液浓度对其电导率和黏度的影响。结果表明,随着微乳液浓度的增大,乳液出现由水包油(O/W)型转变为油包水(W/O)型的相变过程;其伴随的电导率变化和黏度变化有着对应的关系:当电导率升高至平稳阶段对应于黏度的缓慢上升阶段,乳液属于O/W型;当电导率急剧下降阶段对应于黏度的突变阶段,乳液处于相转变(O/W和W/O共存)阶段;当电导率很低且缓慢下降阶段对应于黏度缓慢下降的阶段,乳液属于W/O型;此外,聚醚类化合物可明显降低乳液相转变过程的黏度,其中异构醇聚醚的效果最佳,在添加量为0.5%(质量分数,下同)时,黏度降低的程度最大。更多还原

【Abstract】 A series of microemulsions with various ester contents and emulsif ier ratios were prepared by lauric acid polyoxyethylene esters and polyethylene oleic acid diester as emulsifiers and oleic acid ester as an oil phase,and the effect of emulsion concentration on the electrical conductivity and viscosity of the resulting microemulsions was investigated.The results indicated that these microemulsions exhibited a phase-inversion process from oil in water to water in oil with an increase of emulsion concentration.There is a correlation between the electrical conductivity and viscosity as follows:the increase of conductivity up to a stable stage corresponds to the slowly rising stage of viscosity,which results in an oil-in-water(O/W) microemulsion;the drastic decrease in conductivity corresponds to the mutation stage of viscosity,which caused the coexistence of O/W and water-in-oil(W/O) microemulsions;the gradual decrease in conductivity from a low value corresponds to the slow decline stage of viscosity,which leads to a W/O microemulsion.In addition,the viscosity of microemulsions was significantly reduced by polyethertype surfactants in the phase inversion process,and the isomeric polyether alcohol exhibited an optimum reducing effectiveness for viscosity.更多还原