电场对聚苯并咪唑（PBI）的化学氧化降解的影响作用

When proton exchange membrane fuel cells run, the chemical oxidative degradation of proton exchange membrane takes great effect on the life time of fuel cells. Recently, it is found that the low electric current density and high potencial have effects on the rate and reaction method of oxidative degradation in the membrane during fuel cells' running . In this paper, the effect of electric field on the chemical oxidative degradation of polybenzimidazole is discussed, by means of FTIR and NMR analysis. Results show that imidazole ring is apt to be attacked by oxidative free radicals in the electric field, and possible mechanism of oxidative degradation in electric filed is proposed simutaneously.