The stability of the filtration performance of polyimide(PI)electrospinning membranes is studied through four solvent immersion experiments.The results show that the solvent soaking process has no significant effect on the fiber morphology,fiber web structure,pore size distribution and pressure drop of PI electrospinning membranes.The filtration efficiency of PI electrospinning membrane only slightly decreases after soaking in anhydrous ethanol,acetone and isopropanol,while deionized water has almost no effect.Among them,the filtration efficiency of PI electrospinning membrane decreases from the initial 97.16％to the lowest 94.61％after soaking in isopropanol solvent for 24 hours.Thus,the PI electrospinning membrane can provide continuous and effective protection with good stability in filtration performance and less susceptible to external conditions.
polyimidesolvent soakingfiltration efficiencyelectrospinningpressure drop
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