Another strategy already considered in order to reduce the drop in conductivity after polymerisation is the addition of non-polymerisable additives to the ionic liquid monomer. This technique providesfluidity to the polymer improving the proton transport. The main drawback of polymerised ionic liquids is the mechanical stability that could be improved through the addition of an appropriate crosslinker.However, the proton conductivity would be reduced. As in the case of polymer/ionic liquid blends, most publications deal with the characterisation of these materials and only few of them test the membrane in a fuel cell system. It is still necessary to continue working on the development of polymerised ionic liquid membranes with high proton conductivity and enoughmechanical stability for a real fuel cell application.
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