2-Hydroxyethyl methacrylate (HEMA) and β-cyclodextrin are bridged using toluene-2,4-diisocyanate (TDI) by reacting the OH group of HEMA and one of the primary OH groups of β-cyclodextrin. The modified HEMA is grafted to polyurethane by γ-irradiation. The preliminary study showed that the membrane potential of conventional polymers like polyurethane could be enhanced considerably by this type of modification.
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K. Sreenivasan (1996) studied this question.