Polyoxyethylene Surfactant Microemulsion Phase Behavior And Solubilization

This thesis contains four parts, Chapter I, Introduction; Chapter II, Studies on the phase behavior and the solubilization of microemulsion systems formed by p-octyl polyethylene glycol phenyl ether(OP-10); Chapter III, Studies on the phase behavior and solubilization of microemulsion systems formed by polyoxyethylene (23) lauryl ether (Brij-35); Chapter IV, Studies on the solubilization of tetrachloroethylene in microemulsion systems.ChapterⅠ. IntroductionThe way of the solubilization and the solubilization mechanism of microemulsions were introduced. The influencing factors of the solubilization ability of microemulsion systems, especially the nonionic surfactant-based microemulsion systems, were discussed. The research progress of the solubilization of the nonionic surfactant-based microemulsion systems was also reviewed.ChapterⅡ. Studies on the phase behavior and solubilization of microemulsion systems formed by p-octyl polyethylene glycol phenyl ether (OP-10)The phase behavior of p-octyl polyethylene glycol phenyl ether (OP-10) /1-pentanol/oil/brine microemulsion systems was studied. The effect of different oils, the contents of electrolyte and temperatures on the phase behavior and the solubilization of the microemulsion systems were investigated.1. In the microemulsion systems, surfactant is mainly solubilized in the interfacial layer, while the alkanol is solubilized both in the interfacial layer and in the aqueous or oil phase.2. The solubilization ability decreases with the increase in the length of the alkanes; The solubilization ability of the microemulsion formed by cyclohexane is higher than that of the the microemulsions formed by n-hexane and tetrachloroethylene. 3. For the microemulsion systems containing different inorganic salts with the same concentration, the solubilization ability remains relatively constant (the effect of CsCl is larger).4. As temperature increases, the solubility of the alkanol and the solubilization ability of the system notably decrease.5. The SP* values decrease with an increase in salinities and NaOH contents. The correlation was reversed for systems containing acid.6. The solubility of the alcohol and the solubilization ability of the system would decrease with an increase in the mass ratio of oil to water.ChapterⅢ. Studies on the phase behavior and the solubilization of microemulsion systems formed by polyoxyethylene (23) lauryl ether (Brij-35)The effect of oils, NaOH and NaCl contents on the phase behavior and solubilization of microemulsion systems formed by polyoxyethylene (23) lauryl ether (Brij-35). The phase behavior and solubilization of microemulsion systems formed by Brij-35 and OP-10 were compared.1. The solubility of the alcohol increases, and the solubilization ability of the system decrease with the increase in the length of the alkanes.2. The magnitude of the solubility of the alcohol was in the order NaI>NaBr> NaCl and CsCl > KCl >NaCl. The solubilization ability of the systems with different inorganic salts remains relatively constant.3. The solubility of alkanol and the solubilization ability of the system decrease with the increased salinities and NaOH contents.4. The solubility of alkanol, the mass fraction of alkanol in the interfacial layer and the solubilization ability for microemulsions formed by Brij-35 are higher than that formed by OP-10.ChapterⅣ. Studies on the solubilization ability of tetrachloroethylene in microemulsion systems The solubilization of tetrachloroethylene in different microemulsion systems was studied. The optimal solubilization conditions were investigated.1. The order of the solubilization ability for different surfactant based microemulsion systems: Brij-35﹥C16mimBr﹥C14mimBr﹥OP-10.2. The effect of alkanols on the solubilization ability remain relatively constant. The higher temperature is benefit for the solubilization.3. The effect of different inorganic salts on the solubilization ability of tetrachloroethylene in the microemulsion systems is small.4. The microemulsion systems with higher salinity, lower acid and lower alkali contents have higher solubilization ability of tetrachloroethylene.