A fluorinated aromatic pyridine—bridged dianhydride 2

6-bis(3’

4'-dicarboxyphenyl)-4-(3”

5”- bistrifluorophenyl)pyridine dianhydride(6FDAPA)has been synthesized by the Chiehibabin’s reaction of 3

4-dimethyl acetophenone and 3

5-bis(trifluorometbyl)benzaldehyde

followed by oxidization and dehydration reactions．Two polyimide films were prepared by the dianhydride 6FDAPA and the unfluorinated dianhydride 2

6-bis (3’

4’-dicarboxyphenyl)-4-phenyl pyridine dianhydride(DAPA)with 1

4-bis(4-amino-2-trifluoromethylphenoxy) benzene(6FAPB)

respectively via the two-step polycondensation procedure．The PI-2

derived from 6FDAPA and 6FAPB showed thermal properties similar to those of PI-1

derived from DAPA and 6FAPB．The PI-2 had glass transition temperature of 280℃ and initial thermal decomposition temperature of 580℃．Furthermore

the PI-2 film exhibited higher transparcncy than that of PI-1 and showed cutoff wavelength of 345 nm and more than 80％ of transmittance at 450 nm．