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Complex permittivity of aqueous solutions of poly(ethy1ene glycol) (PEG), polyvinylpyrrolidone (PVP), Ficoll, dextran and of the phases of aqueous dextran-PEG, dextran-PVP, and dextran-Ficoll biphasic systems of varied polymer concentrations have been measured at four frequencies in the range 1&24 GHz at 25 "C by an interferometric transmission method. It is found that the static dielectric constant of water is enhanced in all the polymer solutions directly with the polymer concentration. The polymers examined slow down the reorientational motion of water molecules and the polymer

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