Author/Authors :
Li، نويسنده , , Hongtao and Wu، نويسنده , , Jing and Zhao، نويسنده , , Chengji and Zhang، نويسنده , , Gang and Zhang، نويسنده , , Xiao-Yang and Shao، نويسنده , , Ke and Xu، نويسنده , , Dan and Lin، نويسنده , , Haidan and Han، نويسنده , , Miaomiao and Na، نويسنده , , Hui، نويسنده ,
Abstract :
A series of sulfonated poly(ether ether ketone) containing pendant carboxyl (C-SPEEKs) have been synthesized using a nucleophilic polycondesation reaction. A condensation reaction between 1,2-diaminobenzene and carboxyl resulted in a new series of copolymers containing benzimidazole groups (SPEEK-BIms). The expected structures of the sulfonated copolymers are confirmed by 1H NMR. The dependence of ion exchange capacity, water uptake, proton conductivity and methanol diffusion coefficient of SPEEK-BIm membranes has been studied and compared with their carboxyl acid form. The results suggest that the introduction of benzimidazole groups may be responsible for many excellent properties of the membranes for fuel cell. It is noticeable that the markedly improved oxidative stability is benefit for the application of membrane.
