화학공학소재연구정보센터
Journal of Applied Polymer Science, Vol.88, No.5, 1121-1128, 2003
Polycondensation of sodium tetrazodiphenyl naphthionate and pyromellitic dianhydride under microwave irradiation and the performance of the third-order nonlinear optics
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 (chi((3)) 1.476 x 10(-12)esu) and very fast time responses (15.79 ps). The chi((3)) values of the polyconclensates under microwave irradiation were higher than those of conventional thermopolymerization. (C) 2003 Wiley Periodicals, Inc. J Appl Polym Sci 88: 1121-1128, 2003.