2-Hydroxyethyl methacrylate (HEMA) and beta-cyclodextrin are bridged using toluene-2,4-diisocyanate (TDI) by reacting the - OH group of HEMA and one of the primary - OH groups of beta-cyclodextrin. The modified HEMA is grafted to polyurethane by gamma-irradiation. The preliminary study showed that the membrane potential of conventional polymers like polyurethane could be enhanced considerably by this type of modification.