A diamine monomer o-phenylenedioxybis（5-amino-2-pyridine） was synthesized via reduction of a dinitro compound o-phenylenedioxybis（5-nitro-2-pyridine）, producing a series of new polyimides from this diamine and var...A diamine monomer o-phenylenedioxybis（5-amino-2-pyridine） was synthesized via reduction of a dinitro compound o-phenylenedioxybis（5-nitro-2-pyridine）, producing a series of new polyimides from this diamine and various commercially available aromatic dianhydrides via conventional two-stage processes. The resulting polyimides are able to form tough and transparent films, with decomposition temperatures in the range of 529-551 ℃, and can be dissolved in organic polar solvents. Meanwhile, these polyimides can be degraded in a hydrazine hydrate medium, a degradation mechanism proposed by analyzing the degradation products suggests that the degradable properties could be attributed to the phenyl-2-pyridyl ether structure in the polymer. In addition, the transformation of the compound structure from dinitro compound to damine monomer in the synthetic process is discussed in respect to X-ray structure.展开更多
基金financially supported by the National Natural Science Foundation of China(Nos.21301137 and 21405120)the New Teachers’Fund for Doctor Stations,Ministry of Education(No.20126101120012)+1 种基金the Scientific Research Program by Shaanxi Provincial Education Department(Nos.12JK0578 and 12JK0617)the Scientific Research Foundation of Shaanxi Provincial Key Laboratory(11JS080 and 12JS087 and by NFFTBS(Nos.J1103311 and J1210057)
文摘A diamine monomer o-phenylenedioxybis（5-amino-2-pyridine） was synthesized via reduction of a dinitro compound o-phenylenedioxybis（5-nitro-2-pyridine）, producing a series of new polyimides from this diamine and various commercially available aromatic dianhydrides via conventional two-stage processes. The resulting polyimides are able to form tough and transparent films, with decomposition temperatures in the range of 529-551 ℃, and can be dissolved in organic polar solvents. Meanwhile, these polyimides can be degraded in a hydrazine hydrate medium, a degradation mechanism proposed by analyzing the degradation products suggests that the degradable properties could be attributed to the phenyl-2-pyridyl ether structure in the polymer. In addition, the transformation of the compound structure from dinitro compound to damine monomer in the synthetic process is discussed in respect to X-ray structure.
