Surface resistivity (r s ) of polyurethane (PU) films is reduced from 2.1 Â 10 12 to 9.4 Â 10 10 ohm sq À1 by addition of 1-butyl-3-methylimidazolium bis(trifluoromethanesulfonyl)imide ([C 4 mim][Tf 2 N]) for only 10 ppm. Addition of [Tf 2 N]-type ionic liquids (ILs) for 1 000 ppm leads to the reduction of not only r s from 10 12 to 10 9 ohm sq À1 but also volume resistivity (r v ) from 10 9 to 10 7 ohm cm, suggesting that the ILs are uniformly incorporated into the PU films. These PU films have r s in the order of 10 9 ohm sq À1 even after methanol washing. The antistatic effects are attributed to ionic conductivity of the PU films, which is achieved by low glass transition temperatures of both PU films and [Tf 2 N]-type ILs. These results suggest that [Tf 2 N]-type ILs are excellent antistatic agents for PUs.
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