Density, viscosity, surface tension and excess properties of 1, 3-propanediamine and tetraethylene glycol at T = 293.15 K–318.15 K

The density (ρ), viscosity (η) and surface tension (γ) of 1, 3-propanediamine (1, 3-PDA) and tetraethylene glycol (T4EG) binary mixtures at different temperatures (T = 293.15–318.15 K) were measured. Based on the density data, the excess molar volume (VmE), partial molar volume (V¯m,i), the excess Gibbs free energy (∆G⁎E) and thermal expansion coefficient (αp) of binary mixtures were calculated. Viscosity values (η) can be used to analyze the friction between fluids, and can be used in the design and application of chemical process equipment. Surface tension (γ) can be used to analyze intermolecular forces. The results were fitted to the Redli-Kister (RK) equation. The excess properties were analyzed from interaction at T4EG (1) + 1, 3-PDA (2) binary mixtures. According to the Gaussian calculation, the hydrogen bonding with 1.2 Å −3.0 Å bond length occurred in binary mixtures attributed to the positive dissociation energy of the binary mixtures. The results were further confirmed by FTIR and UV–vis and fluorescence spectra, the hydrogen bonds interaction mode was described as following: ⋯HOC2H4OC2H4OC2H4OC2H4OH⋯N(H2)C3H6(H2)N⋯. •Densities and excess volumes for the T4EG (1) + 1, 3-PDA (2) binary system.•Viscosities and viscosity deviation for the T4EG (1) + 1, 3-PDA (2) binary system.•surface tension and surface tension deviation for the T4EG (1) + 1, 3-PDA (2) binary system.•Intermolecular interaction analyzed as·HOC2H4OC2H4OC2H4OC2H4OH···N(H2)C3H6(H2)N···.•This work enriches the thermodynamic database, but also provides the reference for its application in chemical industry.