Highly compatible acid-base blend membranes based on sulfonated poly(ether ether ketone) and poly(ether ether ketone-alt-benzimidazole) for fuel cells application
作者：Jianli Wang, Junbin Liao, Lan Yang, etc.
關(guān)鍵字：PEM
論文來源：期刊
具體來源：Journal of Membrane Science, http://dx.doi.org/10.1016/j.memsci.2012.05.045
發(fā)表時間：2012年
Abstract
Miscible acid-base blend membranes were developed by incorporating poly(ether ether ketone-alt-benzimidazole) (PEEK-alt-BI) into highly sulfonated poly(ether ether ketone) (SPEEK). The blend membranes with PEEK-alt-BI content up to 20 wt% via optical observation were transparent, indicating an excellent miscibility between the two components. This was further verified by a well-defined morphology and nanoscale domain size of the membranes according to TEM and SEM images. The compatibility between SPEEK and PEEK-alt-BI could be ascribed to the acid-base interactions between the sulfonic acid groups in SPEEK and the benzimidazole groups in PEEK-alt-BI as well as the similarity in the molecular structures of SPEEK and PEEK-alt-BI. It was found that, the addition of PEEK-alt-BI dramatically improved thermal stability and oxidative stabilities, dimensional stability, and mechanical properties of SPEEK membrane. The proton conductivity of SPEEK/PEEK-alt-BI-3 (85/15) membrane is up to 0.087 S/cm at 80 °C, which is higher than that of Nafion117 measured in the same condition. Meanwhile, its methanol permeability is near seven times lower than that of Nafion117 at 25 °C.
