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Organo-soluble fluorinated polyimides were synthesized by the polycondensation of a new aromatic diamine α,α-bis(4-amino-3,5-dimethylphenyl)-4’-fluorophenyl methane with several aromatic dianhydrides.The one-step polymerizationprocedure was conducted at 180℃in m-cresol,producing the polyimides with inherent viscosities of 0.68-0.76 dL.g~(-1).Thepolyimides could be soluble not only in polar aprotic solvents,such as N-methyl-2-pyrrolidinone,and N,N-dimethylacetamide,but also in common organic solvents,such as chloroform,cyclopentanone,m-cresol and so on.Thepolyimide films show excellent transparency with the UV-Vis cut-off lengths of 310-360 nm and light transmittances ofhigher than 80% in the visible region.In addition,the polyimides exhibit good thermal stability with an initial decompositiontemperature(T_d)higher than 530℃and have more than 60% of residual weight retentions at 700℃.
Organo-soluble fluorinated polyimides were synthesized by the polycondensation of a new aromatic diamine α, α-bis (4-amino-3,5-dimethylphenyl) -4’-fluorophenyl methane with several aromatic dianhydrides. 180 ° C in m-cresol, producing the polyimides with inherent viscosities of 0.68-0.76 dL.g -1. The polyimides could be soluble not only in polar aprotic solvents, such as N-methyl-2-pyrrolidinone, and N, N-dimethylacetamide, but also in common organic solvents, such as chloroform, cyclopentanone, m-cresol and so on. Polyimide films show excellent transparency with the UV-Vis cut-off lengths of 310-360 nm and light transmittances of higher than 80% in the visible region. In addition, the polyimides exhibit good thermal stability with an initial decomposition temperature (T_d) higher than 530 ° C and with more than 60% of residual weight retentions at 700 ° C.