polymers with pendent disulfonated aromatic groups bound via sulfonyl imide functions the polymers obtained in examples 10 and 11 are sulfonated by to obtain acidic polymers with pendent disulfonated aromatic groups bound via sulfonyl imide functions the polymers so obtained are further sulfonated to obtain acidic polymers with pendent polysulfonated aromatic groups bound via sulfonyl imide functions proton conductivity was measured using a standard in plane 4 point probe conductivity apparatus with platinum electrodes commercially available form bekktech inc loveland colo the cell was electrically connected to a potentiostat model 273 princeton applied research and an impedance gain phase analyzer si 1260 schlumberger ac impedance measurements was performed using zplot and zview software scribner associates temperature and relative humidity were controlled with a constant humidity oven testequity model 1000h conductivity was measured for the polymer of example 10 the polymer of example 11 and a polymer of about 800 ew essentially similar to the precursor polymer used to make the polymers of examples 10 and 11 thus all three polymers would be expected to have similar backbone crystallinity had the polymer backbone of a polymer with an ew of about 800 however the polymers of examples 10 and 11 expected to have an ew of about 550 by calculation conductivity was also measured for a similar polymer of about 650 ew the polymers of examples 10 and 11 showed improved conductivity at relative humidities of 50 or above at relative humidities of 65 or higher the polymers of examples 10 and 11 demonstrated conductivity comparable to the.