Abstract
In this research, the type of interactions between polyethylene oxide and 1-hexyl-3-methyl imidazolium bromide was studied by FT-IR and UV–Vis methods. The results of FT-IR and UV–Vis spectroscopy confirmed existence of hydrogen bonding between imidazolium cation and oxygen atom of polyethylene oxide. Also, the solution properties of polyethylene oxide in binary mixtures of water and ionic liquid, 1-hexyl-3-methyl imidazolium bromide, were studied at the temperature range of 288.15–313.15K. The effect of ionic liquid, 1-hexyl-3-methyl imidazolium bromide on the thermodynamic quality of water for polyethylene oxide was investigated by viscometric method. The results indicate that thermodynamic quality of water for polyethylene oxide is reduced by addition of 1-hexyl-3-methyl imidazolium bromide and increasing temperature. The flow activation energy was calculated and correlated in terms of polymer concentration. The sign of initial slope of the activation energy versus polymer concentration at zero concentration reveals that thermodynamic quality of ionic liquid aqueous solutions is reduced by increasing temperature.
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