LAUSR

Abstract Dynamic viscosity (v), density (ρ), and surface tension (γ) of the 1,3-propanediol (1,3-PDO) (1) + 1,2-propanediamine (1,2-PDA) (2) binary system with different ratios were studied at the temperature range of 293.15 to 318.15 K and atmospheric pressure. After that, the corresponding viscosity (η) values were calculated from the experimental v and ρ values. From these basic data, viscosity deviation (∆η), surface tension deviation (∆γ), excess molar volume (VmE), apparent molar volume (Vφ,1 and Vφ,2), partial molar volume ( V 1 ¯ and V 2 ¯ ), and isostatic thermal expansion coefficient (αp) were calculated. The VmE, ∆η, and ∆γ values were used to assess the standard deviations (σ) by using the Redlich-Kister (R-K) equation. In addition, combined with FTIR, UV–Vis, FLS, and 1H NMR technologies, the interaction analysis between 1,3-PDO and 1,2-PDA concluded that the intermolecular hydrogen bonding in the system existed as the possible form of -O-H···N-.