(396ac) Novel Cross-Linked Multi- Ammonium Poly (aryl ether oxadiazole) s Using Thermal Crosslink for Anion Exchange Membranes

Novel cross-linked multi- ammonium poly (aryl ether oxadiazole) s using thermal crosslink for anion exchange membranes

Cunpu LI, Xiaofeng XIE *, Changsheng DENG

Institute of Nuclear and New Energy Technology, Tsinghua University, Beijing 100084, China

For a long time, the membrane which has been applied in the battery field, is basically Proton Exchange Membrane (PEM) that it also largely driven the development of the battery industry, but its limitations are increasingly exposed. Compared to PEM, anion exchange membrane technology is not mature. In this work, a novel cross-linked multi-ammonium poly (aryl ether oxadiazole) s ionomer (CMAPAEO) was synthesized. The 3-diethylaminophenol was used to get 4 tertiary amine groups to the backbone. Treated by bromomethane, the anion exchange groups were obtained. The anion exchange membranes were obtained by solution casting method. After thermal-crosslinking a more stable structure was obtained. The chemical structures and properties of the membranes were studied. The highest ionic conductivity of the membrane was achieved at 2.72×10^-2 S cm^-1 at 80 °C. The swelling ratio and TGA properties of the membranes revealed their good mechanical and thermal stability. Moreover, these membranes showed excellent solubility in low boiling point water-soluble solvents such as methanol, which would be helpful for membrane electrode assembly preparation. Also these membranes showed great potential for alkaline electrolyte membrane fuel cells (AEMFCs) applications.