Sulfonated Polyimide Membranes Derived from a Novel Sulfonated Diamine with Pendant Benzenesulfonic Acid for Fuel Cells

For improving the hydrolytic stability of sulfonated polyimides consisting five membered anhydrides, novel (NSPIs) were prepared via polymerization 3,3?,4,4?-benzophenonetetracarboxylic dianhydride (BTDA), with a diamine monomer pendant sulfonic acid group and 4,4-oxydianiline. Water uptake this NSPI an excellent film-forming ability was almost equal to that Nafion® 117, while their ion exchange capacity (IEC) 22% higher than 117. The loss in weight decreased by 53% IEC 66% compared 117; both used quantitatively measure stability, radical oxidative also increased 75% when Mechanically, superior, its proton conductivity 117 at elevated temperatures. All these improvements due introduction group. Taken together, we herein report promising renewable energy source based on SPIs capable displaying enhanced hydrophilicity.