Density measurements of binary aqueous solutions of poly(ethylene glycol), with a nominal average molecular weight of 6000, were used to determine the specific volumes of the solutions with solute-to-solvent mass ratios (mass of the solute/mass of the solvent) of 0.0483–0.5493 and at seven different temperatures (283.15, 285.15, 293.15, 298.15, 303.15, 308.15, and 313.15 K). The difference between the specific volume of a solution and the specific volume of a pure solvent, at a given temperature, was expanded by a virial-type equation, in terms of the solute concentration. The first-order coefficient was the partial specific volume of a solute at infinite dilution. The higher order coefficients corresponded to the contribution of pairs, triplets, and higher order solute aggregates according to the constant-pressure theory of solutions. The functional dependence of the virial coefficients on the temperature was examined in terms of solute–solute and solute–solvent interactions. © 2003 Wiley Periodicals, Inc. J Appl Polym Sci 91: 2685–2689, 2004
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