Synthesis and characterization of polyimides containing pyridine ring

Abstract Monomer 2,2’-bis [4-(5-amino-3-methyl-2-pyridoxy) phenyl] propane was successfully synthesized by 2-chloro-3-methyl-5-nitropyridine and bisphenol A, and the structure of pyridine diamine monomer was confirmed by 1 HNMR. A series of polyimides were prepared by two-step polymerization of the pyridine diamine monomer with five aromatic dianhydride monomers. The results show that the polyimide films had good thermal stability and mechanical properties. Tg was 236-300°C in DSC test and 240-299°C from DMA test, T5% and T10% weight loss at N 2 were 470-492 and 499-515°C, respectively. Moreover, the polyimide films showed outstanding mechanical properties with tensile strength of 72-90MPa, tensile modulus of 1.8-2.4Pa, and breaking elongation of 5-12%. The cut-off wavelength was 338-399nm.