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A 4,4'-( hexafluoroisopropylidene ) diphthalic anhydride- bis [ 4-( 4-aminophenoxy ) phenyl J sulfone ( 6FDA-BAPS) polyamic acid (PAA) was synthesized by using 6FDA and BAPS as reactive monomers and N-methyl-2-pyrrolidone(NMP) as a solvent. The PAA soluti