Fixation of ionic liquids into polyether-based polyurethane films to maintain long-term antistatic properties

Abstract Ionic liquids (ILs) were fixed into polyether-based polyurethane (PU) films for sustainable antistatic properties. Preliminarily, ILs were screened in terms of efficiency of antistatic effect. Surface resistivity ( ρ s ) for IL-doped PU films changed depending the anion species, and the smallest ρ s was found for the PU films containing bis(trifluoromethanesulfonyl)imide ([Tf 2 N])-type ILs. Then, [Tf 2 N]-type ILs composed of ammonium cations having hydroxyl groups were fixed into the PUs through urethane bonds. The fixation of 1000 ppm of the ILs reduced the ρ s of the PU films from 2.1 × 10 12 to 2.1 × 10 9  Ω sq −1 . These IL-fixed PU films were revealed to possess high washing durability confirmed by negligible change of ρ s before and after ultra-sonication treatment in methanol.