wherein the degree of sulfonation of {HEAD ~ the sulfonated poly} provides {TAIL ~ an ion exchange capacity} of 1.5 1.9 meq/g and a resistivity less than 1.2 Ω/cm2 
wherein the degree of sulfonation of { HEAD ~ the sulfonated poly } provides { TAIL ~ an ion exchange capacity } of 1.5 1.9 meq / g and a resistivity less than 1.2 Ω / cm2
OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH