Transformation of iron oxides on PI electrospun membranes

Iron oxides/PI fiber membranes, especially magnetic PI membranes, are important flexible porous materials available application in the field of wave absorption, magnetic recording, membrane separation and catalysts. Therefore, α-Fe 2 O 3 loaded PI composite fibers were prepared by electrospinning of poly(amic acid) PAA solution followed by loading Fe 3+ on the PAA membrane by ion-exchange and then imidization. Then the α-Fe 2 O 3 on PI membrane were reduced by H 2 to give magnetic PI membranes. The content of α-Fe 2 O 3 and Fe 3 O 4 on PI can be controlled by adjustment the ion-exchange time. The saturation magnetization of the composite membranes can reach up to 4   emu/g and the final composite membranes have magnetic response ability.