Study of thermodynamic and transport properties of aqueous system containing poly(ethylene glycol) dimethyl ether 2000 and poly(propylene glycol) 400

Mixture of {poly(ethylene glycol) dimethyl ether 2000 (PEGDME2000) + poly(propylene glycol) 400 (PPG400) + water} forms an aqueous two phase system. For this system the binodal curves were measured at two temperatures from which the single phase region was obtained. The density, speed of sound and viscosity measurements were performed in the single phase region for {poly(ethylene glycol) dimethyl ether 2000 (PEGDME2000) + poly(propylene glycol) 400 (PPG400) + water} system and the corresponding binary ((PPG400) + water) solutions at T = (293.15, 298.15, 303.15, 308.15, and 313.15) K. From these measurements, values of the excess molar volume (VmE) and isentropic compressibility deviation (ΔKS) were calculated and correlated to the modified Wilson and polymer NRTL models. The viscosity values of binary and ternary solutions were correlated by the Eyring-modified Wilson and Eyring-NRTL models. From the density data for the binary and ternary solutions at dilute range, the apparent specific volumes at infinite dilution values were also determined. Some information regarding the segment-solvent and segment-segment interactions is obtained from these values.