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

Under atmospheric pressure of the laboratory (88.94 KPa), the density (rho), viscosity (eta) and surface tension (gamma) 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 similar to 318.15 K. According to the basic data of rho, eta and gamma, excess molar volumes values (V-m(E)), viscosity deviation (Delta eta), surface tension deviation (Delta y), partial molar volume (V-phi,V-1 and V-phi,V-2), apparent molar volume and and thermal expansion coeficiente (alpha(p)) 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 center dot center dot center dot NH2CH2CHNH2CH3. (C) 2021 Elsevier B.V. All rights reserved.