Abstract
A cationic hydrophobically modified ethylene oxide polymer (HM-EO) was used to form aqueous two-phase system with only one phase-forming composition.It was found that the phase separation could be achieved under room temperature.The phase behavior and charge properties of HM-EO aqueous two-phase systems were studied systematically.The amphiphilic property of HM-EO molecule resulted in the micellization and aggregation of micelles in water.The micellar aggregates formed in the bottom phase could be charged,and the net-charge could be adjusted by the pH and conductivity of bulk solution and adding sodium dodecyl sulfate (SDS).The increase of pH would improve the phase separation of HM-EO aqueous two-phase system.The effect of salts on the phase behavior was observed.The influence of cations varied as K~+Na~+,and that of anions as SO~ 2- _4F~-Cl~-Br~-I~-.In addition,the interaction between HM-EO polymer and anion surfactant SDS was studied.The results indicated that the addition of SDS caused the formation of mixed micellar aggregates of SDS and HM-EO which changed significantly the charge property of HM-EO aqueous two-phase systems.
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