Preparation and Properties of Fluorinated Polyimide Thin Film
Hafluorodidiamine(HFBAPP),4,4'-diamino diphenyl ether(ODA)two diamines with 3,3',4,4'-biphentetracarboxylic anhydride(BPDA),hexafluorodihydride(6FDA)two dianhydride species for polycondensation reactions,three fluorinated polyide films(PI-1,PI-2,PI-3),charactercharacterization and dielectric properties,thermal stability and mechanical properties.The results show that at 1 MHz,the PI-1 containing more trifluoromethyl group in the backbone has the lowest dielectric constant of 2.71,which is better than the commercial polyimide(Kapton)film,and the PI-1 with the highest fluorine atomic content has the lowest water absorption,0.24％,which has the highest contact angle and the lowest water absorption among the three fluorine PI.The three fluorine PI Td5 and Td10 are in the range of 496℃ to 526℃ and 515℃ to 544℃,respectively,and the carbon yield at 800℃ is above 50％,with good thermal stability,and the tensile strength of the three PI films still meets the use requirements.
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