Density, viscosity, surface tension, excess properties and molecular interaction of diethylene glycol (1) + 1,2-propanediamine (2) at atmospheric pressure and T = 293.15 K ∼ 318.15 K

Abstract

Under atmospheric pressure of the laboratory (88.94 KPa), the density (ρ), viscosity (η) and surface tension (γ) for binary mixture system of the diethylene glycol (DEG) (1) + 1,2-propanediamine (1,2-PDA) (2) were measured in different concentration ranges at T = 293.15 K ∼ 318.15 K. According to the basic data of ρ, η and γ, excess molar volumes values (VmE), viscosity deviation (Δη), surface tension deviation (Δγ), partial molar volume (V1¯ and V2¯), apparent molar volume (Vφ,1 and Vφ,2) and thermal expansion coeficiente (αρ) were calculated and fitted by Redlich-Kister (R-K) equation, the least square method and other formulas. At the same time, the interaction between DEG (1) + 1,2-PDA (2) was also discussed by Gaussian 09, Fourier Transform infrared spectroscopy (FTIR), UV–visible spectroscopy (UV–vis), and Fluorescence spectroscopy (FLS) etc. The results were displayed that a hydrogen bond was formed between the nitrogen atom (N) on the amino group (–NH2) of 1,2-PDA and the hydrogen atom (H) on the hydroxyl group (–OH) of DEG, which took the form of HOCH2CH2OCH2CH2OH⋯NH2CH2CHNH2CH3.