A novel sulfonated poly(arylene ether) containing triphenylmethane moieties was synthesized by the sulfonation of a designed parent polymer using chlorosulfonic acid as sulfonation agent. The sulfonation took place at the para position of the pendant phenyl rings because of the specially designed parent polymer. The position and degree of sulfonation were characterized by 1H-NMR and elemental analysis. The sulfonated polymers are highly soluble in common organic solvents, such as dimethylsulfoxide, N,N'-dimethylacetamide, dimethylformamide, ethylene glycol monomethyl ether, and can be readily cast into tough and smooth films from solutions. The films showed good thermal and hydrolysis stabilities. Moreover, Fenton's reagent test revealed that the films exhibited superior stability to oxidation. The proton conductivities of the films were comparable with Nafion 117 under same conditions. The membrane electrode assembly (MEA) prepared with the asmade film (706 EW, 100μm dry thickness) shows better cell performance than Nafion 115-MEA in the whole current density range.
Two catalyst precursors—DPB ( N,N′ diphenyl 2,3 butadiimine) and PDP ( N phenyl 2,5 dimethyl pyrrole) were synthesized by reactions of diketones and aniline in alcohol. N,N′ diphenyl 2,3 butadiimine and N phenyl 2,5 dimethyl pyrrole were characterized by IR, 1H NMR and MS, and were found to have diimine and substituted pyrrole ring structure, respectively. The condensates N,N′ diphenyl 2,3 butadiimine and N phenyl 2,5 dimethyl pyrrole both were treated with ZnEt\-2 and then with methnol, resulting in Zn complexes with the diketone\|aniline condensates (DPBZn and PDPZn). The two complexes were applied as catalysts for the copolymerization of CO 2 and cyclohexene oxide. One mole of DPBZn and DPDZn may generate 3000 and 16800 g of polymers, respectively. The obtained copolymers were also determined to have CO 2 fractions of 0 424～0 476 (by 1H NMR) and instrinsic viscosity [ η] of 0 115～0 368?dL/g in chloroform at 30℃.
