Interfacial tension of dextran—polyethylene glycol—water two—phase systems

The interfacial tension between the two aqueous phases of dextran—polyethylene glycol—water systems has been determined by the rotating drop method. Values in the range 5 × 10−4−10−1 dyn/cm have been obtained depending on the polymer concentration. A linear relationship between the logarithm of the interfacial tension and the length of the tie line of the phase diagram was found.