Preparation and characterization of sulfonated poly(ether sulfone)s containing hexabenzocoronene graphene moiety for PEMF

The novel sulfonated poly(ether sulfone)s containing hexabenzocoronene moiety that is partial graphene structure (SPGHPs) for polymer electrolyte membrane were synthesized and characterized their properties. Graphene is an allotrope of carbon and one-atom-thick planar sheets of sp2-bonded carbon atoms that are densely packed in a honeycomb crystal lattice. Poly(ether sulfone) s containing hexaphenylbenzenes on polymer backbone were synthesized by polycondensation and followed intra-cyclization by friedel-craft reaction with lewis acid (FeCl3) to form partial graphene structure. The sulfonation was taken selectively on hexabenzocoronen units with concentrated sulfuric acid. The structure properties of the sulfonated polymers were investigated by H-1-NMR spectroscopy. The resulted ion exchange capacities (IEC) were 1.09 similar to 1.61 meq./g. The water uptakes were 8.84 similar to 15.27% at 30 square C and 18.27%similar to 42.38% at 80 square C with changing the ion exchange capacities. The SPGHP membranes exhibit proton conductivities (80 degrees C, RH 90) of 78.3 similar to 105.7 mS/cm compared with 106.2 mS/cm of Nafion 211 (R).