Studies of the behavior of reverse nonionic surfactant Pluronic 31R1 in aqueous and Propylammonium acetate (PAAc) ionic liquid solutions

ATR FTIR spectroscopy was used to investigate the behaviour of reverse nonionic surfactant Pluronic 31R1 in aqueous and the Propylammonium acetate (PAAc) ionic liquid (IL) solutions at room temperature. The O-H stretching band of Pluronic 31R1/water is deconvoluted into five sub-bands to describe the frequency components related to each coordination type. The hydrated state, due to bound water molecules, and the dehydrated state components were extracted from the curve-fitting between 1400 and 1320 cm−1. The absorbance spectrum of PAAc IL was used for the goal of study in the behavior of Pluronic 31R1 in the Pluronic 31R1/IL and Pluronic 31R1/water/IL solutions. We showed that the Pluronic 31R1 was totally dissolved in a pure PAAc solution confirming the good solvent character of IL. We have also showed, from the ternary Pluronic 31R1/water/PAAc spectra, that the peaks area and the intensity are inversely proportional to the PAAc volume added in solution.