Synthesis and characterization of highly-fluorinated colorless polyimides derived from 4,4′-((perfluoro-[1,1′-biphenyl]-4,4′-diyl)bis(oxy))bis(2,6-dimethylaniline) and aromatic dianhydrides

The authors describe the synthesis and characterization of a highly fluorinated polyimide (PI) series. The new diamine monomer based on perfluorobiphenyl derivative was synthesized and imidized with several aromatic dianhydrides. The resulting PIs exhibit high optical transparency and good thermal properties. In addition, the PIs have low refractive indices because of their high fluorine contents.195