Physical properties and interaction studies for polyethylene glycol 200 and 1,2-propanediamine system at temperature from 293.15 to 318.15 K under atmospheric pressure

Abstract

In this work, density(ρ) and viscosity(η) of polyethylene glycol 200(PEG 200) and 1,2-propanediamine(1,2-PDA) system were measured at temperature from 293.15 to 318.15 K with temperature difference about 5 K under atmospheric pressure condition. In accordance with ρ and η, the excess molar volume (VmE), the thermal expansion coefficient(αp), viscosity deviation(Δη), and the viscosity activation free energy(ΔG*E) were computed and corrected with Redlich-Kister(R-K) equation. In addition, the viscosity values of PEG 200 and 1,2-PDA system were fitted with the three-body McAllister semi-empirical models. The intermolecular interactions between PEG 200 and 1,2-PDA were analyzed by FTIR, UV–vis, and Fluorescence spectral results, which were intermolecular hydrogen bond, and the interaction mode was expressed as follow: CH3CH(NH2) CH2(H2)N⋯H-OCH2CH2-.According to the data of VmE and ΔG*E, it is known that when the molar ratio of PEG to 1,2-PDA was about 1:1, the interaction is strongest. Theoretically, CO2 capture absorption with this system can effectively inhibit the volatilization of amines.