Modes of Interaction in Binary Blends of Hydrophobic Polyethers and Imidazolium Bis(trifluoromethylsulfonyl)imide Ionic Liquids

Lower critical solution behavior in binary blends of hydrophobic polyethers with 1-hexyl-3-methylimidazolium bis­(trifluoromethylsulfonyl)­imide ([hmim]­[Tf₂N]) exhibited a difference in lower critical solution temperature (LCST) greater than 80 °C between structurally homologous poly­(isopropyl glycidyl ether) (PiPGE) and poly­(n-butyl glycidyl ether) (PnBGE). Replacement of the acidic hydrogen on the imidazolium ring with a methyl group (i.e., 2,3-dimethyl-1-hexyl-imidazolium bis­(trifluoromethylsulfonyl)­imide ([hmmim]­[Tf₂N])) significantly reduced the LCST of both the PnBGE/ionic liquid (IL) mixture and the PiPGE/IL mixture. Differing degrees of hydrogen bonding between the polymer and the cation cannot alone explain the observed behavior. Similar hydrogen bonding between the [hmim]⁺ cation and both polymers from molecular dynamics simulations was consistent with this conclusion. However, stronger [hmim]⁺ cation tail/polymer alkyl side-chain interactions for PnBGE, with consequently stronger cation/anion interactions, point to solvophobic interactions as the basis for the large LCST difference between the PnBGE/[hmim]­[Tf₂N] and PiPGE/[hmim]­[Tf₂N] blends.