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Sodium tetrazodiphenyl naphthionate and pyromellitic dianhydride were polycondensed under microwave irradiation and oil-bath heating. The resultant poly-(amic acid) was imidized in the solid phase by microwave irradiation and oil-bath heating. The effects of the reaction temperature, the concentration of monomers, the monomer ratio, and the microwave irradiation time on the conversion, intrinsic viscosity, and third-order nonlinear optical (NLO) coefficient of the polymer were investigated. The results showed that the polycondensates had high third-order NLO coefficients ( (3) ϭ 1.476 ϫ 10 Ϫ12 esu) and very fast time responses (15.79 ps). The (3) values of the polycondensates under microwave irradiation were higher than those of conventional thermopolymerization.

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