Preparation And Properties Of Anionexchange Membrane Based On Cyclicolefin Copolymer

The anion exchange membrane fuel cell operates under alkaline conditions and can use non-precious metals as a catalyst.It also has the advantages of fast oxygen reduction rate of the cathode and simple water management,and has recently become a research hotspot in the field of fuel cells.AEM is a key material for alkaline fuel cells,but the commercial AEM is only A201 film from Tokuyama,Japan,and has problems such as low conductivity and poor chemical stability.A series of anion exchange membranes(AEM)s have been prepared through the ring-opening metathesis polymerization(ROMP)of exo-1,4,4a,9,9a,10-hexahydro-9,10(1’,2’)-benzeno-1,4-methanoanthracene(HBMN)and5-hexyl-2-norbornene(HN),followed by hydrogenation and chloromethylation.The structures of the polymers were characterized by proton nuclear magnetic resonance(1H NMR),the degree of chloromethylation and ion exchange capacity were calculated via the integral ratios of characteristic peaks.The correlation between ion exchange capacity and water uptake,bicarbonate conductivity,and mechanical properties with ion exchange capacity were studied systematically explored.AEM Cl-H-HMHN-b-3 with an IEC value of 2.16 mmol g-1 showed the best overall properties.Its bicarbonate conductivity,water uptake rate and swelling rate at 20 oC are 20.6 mS cm-1,34.1% and 3.2%,respectively.In this paper,an anion exchange membrane was prepared by reacting HBMN with dicyclopentadiene(DCPD).When the ratio of HBMN to DCPD was 80:20 and the reaction time was 40 hours,the membrane performance was the best,and the ion exchange capacity was 2.16 mmol.At g-1,20 oC,the conductivity,water absorption and swelling ratio were16.67 mS cm-1,46.8% and 6.91%,respectively.At 80 oC,the conductivity and water absorption were 39.03 mS cm-1 and 59%,respectively.