Iyyaswami, I.Murugesan, S.Amaresh, S.P.Govindarajan, R.Murugesan, T.2026-02-052009Journal of Chemical and Engineering Data, 2009, 54, 3, pp. 1100-1106219568https://doi.org/10.1021/je800769chttps://idr.nitk.ac.in/handle/123456789/27651The densities and viscosities of binary and ternary solutions of the poly(ethylene glycol) 4000 (PEG4000) + diammonium hydrogen phosphate + water system were determined at different temperatures [(298.15, 303.15, 308.15, 313.15, and 318.15) K]. The measured density and viscosity data of all the binary and ternary systems were fitted to available empirical correlations, for the corresponding temperatures. The density data show a linear variation with mass fraction of the polymer for all temperatures. The viscosity data of all the solutions were correlated as a function of their mass fraction, using a nonlinear equation, for the five different temperatures covered in the present work. Densities and viscosities of PEG4000 - diammonium hydrogen phosphate two-phase systems have been measured at (298.15, 303.15, 308.15, 313.15, and 318.15) K. The tie line lengths (TLL) of the aqueous two-phase systems have also been estimated, and the effect of the physical properties on the TLL is also reported. © 2009 American Chemical Society.Aqueous two-phase systemsDensity datumDi-ammonium hydrogen phosphatesEmpirical correlationsLinear variationsMass fractionsPoly(ethylene glycol)Ternary solutionsTie linesTwo-phase systemsViscosity datumWater systemsEthyleneEthylene glycolHydrogenNonlinear equationsPolyethylene glycolsPolyethylene oxidesTernary systemsViscometersWater piping systemsWaterworksViscosity