Synthesis and characterization of fluorine‐containing aromatic polyethers from tetrafluoroisophthalonitrile and bisphenols

New aromatic polyethers having inherent viscosities of 0.43–0.91 dL/g were synthesized by the phase‐transfer catalyzed polycondensation of tetrafluoroisophthalonitrile with various hisphenols in a nitrobenzene‐water system. All the polyethers were amorphous and soluble in N‐methyl‐2‐pyrrolidone and nitrobenzene. They were cast into transparent and flexible films from the solutions. These polymers had glass transition temperatures around 130°C and dia not lose weight below 400°C in either air or nitrogen.