Phase Behavior And Physicochemical Properties Of A Green Microemulsion System Constructed By Nonionic Surfactants/long-chain Fatty Acid Esters

The thesis contains four parts.Chapter I.Introduction.Chapter II.The phase behavior,solubilization and influencing factors of microemulsion systems containing Tween/propan-1-ol/long-chain fatty acid ester.Chapter III.The phase behavior and solubilization of the microemulsion system containing Brij35 and long chain fatty acid ester.Chapter IV.Green microemulsion systems containing APG,1-octen-3-ol and IPP.Chapter I.IntroductionThe basic knowledge of microemulsion,the phase behavior and application of microemulsions were introduced.The research progresses on microemulsions systems containing nonionic surfactants and polar lipophilic oils were reviewed.Chapter II.The phase behavior,solubilization and influencing factors of microemulsion systems containing Tween/propan-1-ol/long-chain fatty acid esterThe phase behavior and solubilization ability of long chain fatty acid ester IPM,IPP and EM in microemulsions containing Tween surfactants,were studied using theε-βfishlike phase diagram method.The phase behavior and solubilization ability were compared with those containing alkane.The effects of different types of Tween surfactants,oil/water mass ratios(α),NaCl contents(w)and temperatures(T)on the phase behavior and physicochemical parameters of the microemulsions were also investigated.(1)In the microemulsions containing octane,decane,dodecane,IPM,IPP or EM,respectively,the order of magnitude of A~S is:dodecane>IPP>IPM>decane>EM>octane.However,the magnitude order of SP*is:octane>EM>IPM>decane>IPP>dodecane.(2)With the increase in oil-to-water ratios(α),the solubility of alcohol in oil(S_A)and the solubilization capacity(SP*)decrease,the mass fraction of alcohol in the interfacial film(A~S)increase.(3)In the microemulsions containing Tween20,Tween60 or Tween80,respectively,the magnitude order of SP*is:Tween60>Tween80>Tween20.(4)As the salinity of the system increases,the solubilization ability of the microemulsion system increases.With the increase in temperature,the solubilization ability of the microemulsion system decreases.Chapter III.The phase behavior and solubilization of the microemulsion system containing Brij35 and long chain fatty acid esterThe solubilization ability and phase behavior of microemulsions systems containing long chain fatty acid ester and Brij35 were studied.The effects of different types of oil/water mass ratios(α),NaCl contents(w)and temperatures(T)on the phase behavior and physicochemical parameters of the microemulsions were also investigated.(1)In the microemulsions containing long chain fatty acid ester or long chain alkanes,the order of the magnitude of A~S is:dodecane>IPP>IPM>decane>EM>octane.However,the order of the magnitude of SP*is:octane>EM>IPM>decane>IPP>dodecane.(2)In the microemulsions containing Brij35 and IPP,with the increase of oil-to-water ratios(α),the solubility of alcohol in oil(S_A)and the solubilization capacity(SP*)decrease,the mass fraction of alcohol in the interfacial film(A~S)increase.(3)As the salinity of the system increases,the solubilization ability of the microemulsion system increases.(4)With the increase of temperature,the solubilization ability of the microemulsion system decreases.Chapter IV.Green microemulsion systems containing APG,1-octen-3-ol and IPPThe phase behavior and optimum solubilization ability of APG/IPP/1-octen-3-ol/brine microemulsion were studied.The effects of oil,salinity and temperature on the phase behavior of the microemulsion systems were investigated.(1)The effects of the volume ratio of 1-octen-3-ol to ethanol on the phase behavior of the microemulsion systems were investigated.It is found that when the volume ratio is 7:1,the solubilization ability of the microemulsion system reached the maximum.(2)With the increase in temperature,the solubilization ability of APG/IPP/1-octen-3-ol/brine microemulsion system decreases slightly.(3)With the increase in salinity,the solubilization ability of APG/IPP/1-octen-3-ol/brine microemulsion system increased.(4)In the microemulsions containing EM,IPM or IPP,respectively,the order of solubilization ability is EM>IPM>IPP.