Unsaturated oligoimides of cardic diamines and polymers based on them

Abstract

The reaction between the dianhydride of 3,3′,4,4′-benzophenonetetracarboxylic or 3,3′,4,4′-diphenyloxidetetracarboxylic acid with an appropriate excess of a cardic diamine (9,9-bis-(4′-aminophenyl) fluorene, 9,9-bis-(4′-aminophenyl) anthrone-10, 3,3-bis-(4′-aminophenyl) phthalide or 3,3-bis-(4′-aminophenyl)phthalimide) has been used to synthesize oligoimides of cardic diamines with end acryl- or methacrylamide groups; the oligoimides are readily soluble in DMF, DMAA and tetrachlorethane and have various molecular masses and softening points of 210–310°C. It has been shown that the thermal stability of the unsaturated oligoimides increases as their degree of polymerization is increased. Crosslinked polyimides, characterized by high heat resistance and thermal stability, have been obtained by the thermal polymerization in bulk at 250–310°C of the oligoimides that have been synthesized.