Ionic liquids containing 2,3-dimethyl-1-octylimidazolium (DMOIm(+)) cation and BF4-, PF6-, CF3SO3-, N(CF3SO2)(2)(-) anions have been synthesized and incorporated in different polymers to obtain polymer electrolytes which show conductivity over a wide range (10(-3)-10(-6) S/cm). Polymer electrolytes containing polyvinylideneflouride-hexafluoropropylene (PVdF-HFP)in DMOImCF(3)SO(3) show maximum conductivity in the 20-120 degrees C temperature range which is only an order of magnitude lower than for the neat ionic liquid (10(-2) S/cm). (c) 2005 Elsevier B.V. All rights reserved.