Electrochemical performance of membranes based on hydrogenated polynorbornenes functionalized with imide side groups containing sulfonated fluorinated moieties

► New sulfonated fluorinated polynorbornene dicarboximide as ion-exchange membrane. ► Proton conductivity of the ionic polynorbornene of the same order of magnitude as that reported for Nafion membranes at the same temperature. ► Electrochemical characteristics of the membrane involving osmotic flow, electromotive forces of concentration cells and proton conductivity are reported.