醇醚糖苷微乳液相行为研究

用拟二元及拟三元相图法研究了醇醚糖苷(AEG30、AEG08)/醇/环己烷/水四组分微乳液的相行为,与烷基糖苷(APG)相行为作了比较,并用内聚能比(R比)理论作了解释。结果表明,拟二元体系,随着正丁醇质量分数的增大,APG、AEG08微乳液类型发生WinsorⅠ→Ⅲ(Ⅳ)→Ⅱ的转变,AEG30发生WinsorⅠ→Ⅲ(Ⅳ)→Ⅱ→Ⅳ→Ⅰ的转变,表面活性剂EO链越长,发生WinsorⅠ→Ⅲ(Ⅳ)转变所需最小醇质量分数越大;随着正戊、己醇质量分数的增大,AEG30微乳液类型发生WinsorⅠ→Ⅲ(Ⅳ)→Ⅰ转变。拟三元体系,随着表面活性剂及正丁醇(S+A)质量分数的增大,AEG微乳液类型也发生WinsorⅠ→Ⅲ(Ⅳ)→Ⅱ的转变,对于APG只出现WinsorⅡ、Ⅳ;油水比对AEG30/正戊、己醇/环己烷/水微乳相行为有很大的影响。

Studies on Phase Behaviors of Alkylethoxyglucoside Microemulsions

The phase behaviors of the microemulsion for the quaternary system of the alkylethoxyglucoside(AEG30,AEG08)/alcohol/cyclohexane/water were studied with the pseudo-binary and pseudo-ternary phase diagrams.They were compared with those of alkylpolyglucoside(APG).Such behaviors were explained with the R ratio theory.Results show that the transformation of Winsor Ⅰ→Ⅲ(Ⅳ)→Ⅱ in the APG,AEG08 microemulsion type were observed from the pseudo-binary phase diagram of APG,AEG08 with increasing the mass fraction of n-butanol.For the transformation of Winsor Ⅰ→Ⅲ(Ⅳ)→Ⅱ→Ⅳ→Ⅰ in the AEG30 microemulsion,the longer the EO chain of the surfactant,the higher the minimum mass fraction of needed alcohol is for the transformation of Winsor Ⅰ to Winsor Ⅲ(Ⅳ) with increasing the mass fraction of n-pentanol,n-hexanol.The transformation of Winsor Ⅰ→Ⅲ(Ⅳ) Ⅰ in the AEG30 was also found in the AEG30 microemulsion.In addition,the transformation of Winsor Ⅲ(Ⅳ)→Ⅱ was also discovered from pseudo-ternary phase diagram in AEG08,AEG30 with increasing the mass fraction of surfactant and alcohol(S+A).As in the case of APG,the transformation of Winsor Ⅱ,Ⅳ was also discovered.The oil-water ratio has a great influence on the phase behaviors of AEG30/n-pentanol,n-hexanol/cyclohexane/water.