Article ID Journal Published Year Pages File Type
5408714 Journal of Molecular Liquids 2017 27 Pages PDF
Abstract
This work reports density (ρ) and viscosity (η) data for binary system of polyethylene glycol 200 (PEG) and N-methyl-2-pyrrolidone (NMP) over the whole concentration range, at 288.15, 293.15, 298.15, 303.15, and 308.15 K as a function of composition at atmospheric pressure. From the experimental density and viscosity data, excess molar volume (VmE), viscosity deviation (Δη) and the excess Gibbs free energies of activation for viscous flow (ΔG*E) were calculated, and the results were fitted to a Redlich- Kister equation to obtain the coefficients and estimate the standard deviations between the experimental and calculated quantities. Based on kinematic viscosity (ϑ) data, enthalpy of activation for viscous flow (ΔH*), entropy of activation for viscous flow (ΔS*), and Gibbs energies of activation for viscous flow (ΔG*) were also calculated. In addition, the interactions between the unlike molecules of the PEG and NMP which were supported by FTIR spectra for the binary system of PEG and NMP were studied.
Related Topics
Physical Sciences and Engineering Chemistry Physical and Theoretical Chemistry
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