Density, viscosity, surface tension, and spectral analysis of polyethylene glycol 300 + 1,2-Propylenediaminebinary liquid mixture

Abstract

At T = 293.15 ∼ 318.15 K, the density (ρ), viscosity (η), and surface tension (γ) data of polyethylene glycol 300 (PEG300) and 1,2-propane diamine (1,2-PDA) binary liquid mixture in the entire composition range were systemically measured. Meanwhile, the influence of different temperatures on the physical properties of the binary liquid mixture was deeply discussed. The values of ρ and η of PEG300 were compared with the reported values of ρ and η of different linear alcohols under the same experimental conditions. It was found that the values of ρ and η of linear alcohols were related to the number of carbon chains. Under isothermal conditions, the values of ρ and η increased with the number of carbon chains. After that, excess molar volume (VmE), excess viscosity (ηE), surface tension deviation (Δγ), excess Gibbs energy of activation of viscous flow (ΔG∗E), and molar isobaric thermal expansion (Ep,m) of PEG (1) + 1,2-PDA (2) binary mixture were calculated. The η values were fitted with four semi-empirical formulas, and the VmE, ηE, and Δγ values were fitted with Redlich-Kister (R-K) equation. IR, UV, FLS, and Raman spectral technologies were used to further prove the interaction among different molecules of the liquid mixture.