Thermal imidization restricts the application of fluorinated polyimide, but the low temperature imidization could cause a certain impact on its performance. PAA was synthesized with fluorinated monomer 4, 4'-(six fluoro isopropenyl) phthalic anhydride(6 FDA) and 4 4'-, two amino-2, 2'-three fluorine biphenyl(TFMB), and then through gradient heating by 80 ℃/1 h, 110 ℃/2 h, 150℃/2 h, 200 ℃/1 h, 250 ℃/30 min, 300 ℃/30 min and adding acetic anhydride/pyridine mixture into PAA, two kinds of PI films were prepare...
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