Hybrid membranes based on block co-polymer ionomers and silica gel. Synthesis and characterization

The results indicate the existence of a complex microstructure formed by different phases corresponding to both ionic and non-ionic blocks of the co-polymer as well as the aggregates or clusters owed to the electrostatic interaction among ion pairs. Conductivity values are similar to Nafion and they improve with hydration time for hybrid membranes due to the absorbent nature of the inorganic filler. Likewise, methanol crossover is lower than in Nafion, probably due to the barrier effect exerted by the non-sulfonated blocks of the co-polymer.