| abstract |
The invention provides a filter material, which comprises a support layer, a first selective layer positioned on the support layer, and a second selective layer positioned on the first selective layer, wherein the first selective layer is formed by mutually interlacing polyimide and ionic macromolecules, the polyimide has at least one repeating unit with a structure shown in a formula (I), wherein A 1 is , A 2 is R 1 , R 2 is-H, -CF 3 , -OH, -Br, -Cl, -F, C 1-6 alkyl or C 1-6 alkoxy, and X and Y are independently a single bond, -O-, -CH 2 -, -C (CH 3 ) 2 -or-NH-. |