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Synthesis and Properties of Sulfonated Polyimides from Sulfophenoxy Benzidines

2006; The Society of Photopolymer Science and Technology (SPST); Volume: 19; Issue: 2 Linguagem: Inglês

10.2494/photopolymer.19.273

1349-6336

Yoshiki Suto, Yan Yin, Hidetoshi Kita, Ken‐ichi Okamoto,

Membrane-based Ion Separation Techniques

Novel sulfonated diamine isomers, 2,2'-bis(4-sulfophenoxy)benzidine (2,2'-BSPOB) and 3,3'-bis(4-sulfophenoxy)benzidine (3,3'-BSPOB), were prepared by direct sulfonation with fuming sulfuric acid from corresponding diamines of 2,2'(or 3,3')-bisphenoxybenzidine. Sulfonated polyimides (SPIs) were synthesized from these sulfonated diamines of BSPOB and 1,4,5,8-naphthlene tetracarboxylic dianhydride (NTDA) via polycondensation. Tough and ductile membranes were obtained by solution casting method. The SPI membranes with reasonable ion exchange capacities (IECs) displayed high proton conductivity and excellent water stability.