Thermally stable sulfone‐containing poly(amide‐imides)

Abstract Novel sulfone containing poly(amide‐imides) have been prepared by reacting 3,4‐dicarboxy‐4′‐(chloroformyl)‐diphenylsulfone dianhydride with various aromatic diamines. Relatively high molecular weight polymers were obtained by using a two‐step procedure. Transparent poly(amide‐imide) films, varying in color from dark yellow to colorless, were formed by thermally treating polyamic acid solutions. All films showed good thermal stability.