Measurement and Modeling of Density, Kinematic Viscosity, and Refractive Index for Poly(ethylene Glycol) Aqueous Solution at Different Temperatures

The density, kinematic viscosity, and refractive index of aqueous solutions of poly(ethylene glycol) (PEG) have been measured at (298.15, 303.15, 308.15, 313.15, 318.15, 323.15, and 328.15) K. The PEG samples had an average molecular mass (1000 and 10000). The density and refractive index results were correlated to a first-order polynomial with respect to PEG mass fraction at each temperature. It was shown that from the refractive index results the density of the aqueous PEG mixtures can be predicted accurately. The kinematic viscosity results were correlated by a newly modified Eyring's viscosity model. The parameters of the model were determined and presented.