Micellization and aggregation approach in aqueous amphiphilic ionic liquid and anionic polymer system

Abstract

In this study, we investigate the aggregation of an ionic liquid (IL), 1-allyl-3-methylimidazolium bromide ([AMIM][Br]) in aqueous solution containing variable amounts of poly(diallyldimethylammonium) chloride (PDADMAc), using conductivity, density, and viscosity techniques in combination with the molecular dynamics simulation approach. The critical micelle concentration (cmc) after micellization for IL in solutions was derived from the conductivity measurements. The effect of PDADMAc on the physicochemical properties of IL in aqueous solution was investigated using comprehensive biophysical techniques such as UV-visible absorption spectroscopy, viscosity (η) and density (ρ) measurements. With the addition of PDADMAc concentration (0, 0.25, 0.05, and 0.1 g.l-1), cmc values increased due to the interaction between IL and PDADMAc. Our UV spectroscopy results showed that the interaction between PDADMAc and [AMIM][Br] was due to the significant differences in the interactions between the amide group of the polymer, the ionic liquid ions, and the water molecules. The apparent molar volumes (V) were calculated from the experimental densities for the (AMIM)(Br)-PDADMAc systems studied. Viscosity data decreased with increasing IL concentration and increased with [PDADMAc]. A computer simulation was used to investigate the aggregate structure between (AMIM)(Br]) and PDADMAc.