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A novel sulfonated diamine monomer attached by sulfobenzoyl side groups has been synthesized and characterized by 1H NMR spectra. The synthetic procedures of diamine monomer and its derivatives from naphthalenic dianhydride are described. As one of the proton conductive polymer materials, the corresponding sulfonated polyimides show good solubility property, high thermal stability and high proton...
A series of sulfonated polyimides (SPIs) were synthesized from a new side group sulfonated diamine, 2,2′-bis(4-sulfobutoxy) benzidine monomer (2,2′-BSBB), 1,4,5,8-naphthalenetetracarboxylic dianhydride (NTDA), and common nonsulfonated diamine monomers by polycondensation reaction. Membranes were prepared by casting their m-cresol solutions. The SPI membranes displayed proton conductivity σ values...
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