Kinematic viscosities of aqueous mixtures containing poly(ethylene glycol)s (PEGs) with nominal molecular masses ranging from (200 to 10 000) g·mol-1 have been determined at various concentrations and temperatures. The binary experimental data were used to adjust the parameters of a Kumar-like equation. Relative errors around 5.5% were observed between calculated and experimental results. The adjusted parameters also allowed the viscosity prediction for multicomponent mixtures, with an overall deviation of 9.9%.

Kinematic viscosities of binary and multicomponent mixtures containing poly(ethylene glycols) were measured as a function of temperature. Viscosities of the binary mixtures were used to calculate the excess molar Gibbs energy of activation for viscous flow G* E . The G* E values are positive over the entire composition range and they increase as the difference in the molecular masses of the two polymers increases. The group-contribution viscosity model GC-UNIMOD was employed to correlate the viscosity of the binary systems and then to predict the viscosities of the multicomponent mixtures. Average absolute deviation around 3.5% was obtained for the viscosity calculations using the GC-UNIMOD model.