Synthesis and study of new fluorinated poly(imide-amide)s

New fluorinated poly(imide-amide)s have been synthesized by solution polyco ndensation of various aromatic diamines containing a naphthalene unit with diacid chlorides having both imide and hexafluoroisopropylidene (6F) groups . These polymers are soluble in polar aprotic solvents, such as N-methylpyr rolidone (NMP) or N,N-dimethylformamide (DMF), and can be cast into flexibl e thin films from solutions. They show high thermooxidative stability with decomposition temperatures being above 425 degreesC and glass transition te mperatures being in the range of 235-305 degreesC. The polymer films exhibi t a low dielectric constant and tough mechanical properties.