Synthesis of polyimides from N,N′‐bis(phenylsulfonyl)pyromellitimide and aromatic diamines

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Abstract
A novel and successful synthesis of polyimide has been performed by the two‐step polymerization of N,N′‐bis(phenylsulfonyl)pyromellitimide (BPSP) and bis(4‐aminophenyl) ether (ODA). The ring‐opening polyaddition reaction proceeded in N‐methyl‐2‐pyrrolidone at room temperature through the formation of the open‐chain polyamide, which was subsequently converted by heating to the polyimide along with the elimination of benzenesulfonamide. The polymerization of BPSP with ODA took place fairly rapidly to give the polyamide having inherent viscosity in the range of 0.6–0.8. The polyamide solution was resistant to hydrolysis, but was somewhat susceptible to imidization reaction. The thermal imidization of the open‐chain polyamide occurred far more readily than that of the polyamic acid derived from pyromellitic dianhydride and ODA.

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