Preparation and performance analysis of polyimide nanofiber filter membranes
In order to explore the effect of amination temperature on the performance of polyimide(PI)nanofibers,diamine monomer 4,4-diamino diphenyl ether(ODA)and dianhydride monomer phenylanhydride(PMDA)are dissolved in N,N-dimethyl acetamide(DMAc),and it is prepared with different concentrations of polyamide acid(PAA)solution,and made into PAA nanofiber membrane by electrostatic spinning,then form PI nanofiber filter membrane by thermal amination treatment of different temperatures.We study the microscopic morphology,filtration performance,air permeability and moisture performance of the filter membrane.The results show that when the PAA concentration is 30％,the nanofiber form is best,when the amination temperature is 200 ℃,the filtration efficiency of the filter membrane is 95.86％,the resistance pressure drop is 610.56 Pa,the best filtration performance balance;the maximum strength is 3.24 MPa;the permeability rate is 98.19 mm/s;when the amination temperature is 190 ℃,the water contact angle is 95.26,the best wetting performance is approached;the moisture transmission performance decreases with the rising amination temperature.
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