Abstract
In this work, the intrinsic viscosities of poly(ethylene glycol)/poly(vinyl pyrrolidone) (PEG/PVP) blends were measured in water–ethanol solutions from (283.1 to 313.1) K. The expansion factors of the polymer chains were calculated from the intrinsic viscosity data. The thermodynamic parameters (entropy of dilution parameter, the heat of dilution parameter, theta temperature, polymer–solvent interaction parameter, and second osmotic virial coefficient) were derived by the temperature dependence of the polymer chain expansion factor. The thermodynamic parameters indicate that mixed water–ethanol are changed to the weak solvents for PEG/PVP blends by increasing temperature. The compatibility of PEG/PVP blends was explained in terms of the difference between experimental and ideal values of the Huggins parameter, solvent–polymer interaction parameter, and second osmotic virial coefficient. The results indicate that the PEG/PVP blends are compatible in mixed water–ethanol.
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