A new flame-retardant polyamide containing phosphine oxide and azobenzene moieties in the main chain was synthesized by the solution polycondensation reaction of 4,4`-azodibenzoic acid with bis(3-aminophenyl) phenyl phosphine oxide using thionyl chloride, N-methyl-2-pyrrolidone and pyridine. This new polymer was obtained in high yield (96%) and showed high inherent viscosity (0.55 dL/g) and was characterized by elemental analysis, FT-IR spectroscopy, thermal gravimetric analysis (TGA and DTG) and solubility test. Furthermore, another polyamide was prepared by solution polycondensation reaction of 4,4`-azodibenzoic acid with 1,4-phenylene diamine and its flame-retardant behavior was compared by the use of the LOI with the previous one.
FAGHIHI, KHALIL and HAGIBEYGI, MOHSEN (2007) "New Aromatic Polyamide with Azo and Phosphine Oxide Groups in the Main Chain," Turkish Journal of Chemistry: Vol. 31: No. 1, Article 8. Available at: https://journals.tubitak.gov.tr/chem/vol31/iss1/8