We report herein the density, viscosity, and excess properties of poly(ethylene glycol) 400 (PEG 400) + dimethyl sulfoxide (DMSO) and 600 (PEG 600) + water binary mixtures at temperatures from (298.15 to 323.15) K and (298.15 to 308.15) K, respectively, covering the whole composition range at atmospheric pressure. The excess molar volumes (V m E) and viscosity deviation (Δη) were calculated using the measured density and viscosity of the binary systems. They were correlated as a function of temperature and composition and fitted by the Redlich–Kister polynomial equation. The results of pure PEG 400 and 600 were also obtained and were compared with the data reported in previous literature.

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