本文以PEG-柠檬酸钠双水相体系为研究对象，研究了外加电场对聚合物-有机盐双水相体系分相速率的影响。结果显示增加电场可使聚合物-有机盐双水相体系分相速率提高1～3倍。进而考察了外加电场方向、双水相体系的系线长度（TLL）、相比（VR ）、PEG分子量对双水相体系分相速率和电促分相效率的影响。结果表明，电场方向对电促分相效率影响不大；系线长度对分相速率无明显规律性影响，而对电促分相效率影响较大，TLL＝40时电促分相效率最高；随着双水相体系相比或成相组分PEG分子量的增加，双水相体系分相速率增大，而电促分相效率降低。%Electrokineticdemixing of PEG-organic salt aqueous two-phase system was studied in this paper. PEG-sodium citrate was selected as the model system. It was shown that added electric field could effectively accelerate the demixing rate of two-phase sys-tems 1-3 times. Then the effect of field polarity of added field,volume ratio(VR )of top and bottom phase,tie line length(TLL)of a-queous two-phase system and PEG molecular weight on demixing rate and on electrokineticdemixing efficiency were taken into stud-y. It turned out that the field polarity had little effect on electrokineticdemixing efficiency;TLL made no obvious regular effect on demixing rate,but had great influence on electrokineticdemixing efficiency. When TLL=40,theaqueous two-phase system had the highest electrokineticdemixing efficiency;the demixing rate went up and the electrokineticdemixing efficiency went down as the a-queous two-phase system phase ratio increasing or the phase composition PEG molecular weight growing.
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