Seven new polyamides 6a-g were synthesized through the direct polycondensation reaction of 2,5-bis [(4-carboxyanilino) carbonyl] pyridine 4 with seven derivatives of aromatic diamines 5a-g in a medium consisting of Nmethyl-2-pyrrolidone, triphenyl phosphite, calcium chloride, and pyridine. The polycondensation reaction produced a series of novel polyamides containing pyridyl moiety in the main chain in high yield with inherent viscosities between 0.32-0.72 dL/g. The resulted polymers were fully characterized by means of FTIR spectroscopy, elemental analyses, inherent viscosity, and solubility tests. Thermal properties of these polymers were investigated by using thermal gravimetric analysis and differential thermal gravimetric. All the polymers were soluble at room temperature in polar solvents, such as N,N-dimethyl acetamide, N,N-dimethyl formamide, dimethyl sulfoxide, and N-methyl-2-pyrrolidone. 2,5-Bis[(4-carboxyanilino) carbonyl] pyridine 4 as a new monomer containing pyridyl moiety was synthesized by using a two-step reaction. At first 2,5-pyridine dicarboxylic acid 1 was converted to 2,5-pyridine dicarbonyl dichloride 2. Then diacid 4 was prepared by condensation reaction of diacid chloride 2 with p-aminobenzoic acid 3.
Six new poly(amid-imide)s containing chalchone and hydantoin moieties in the main chain were synthesized through the polycondensation reaction of 1,3-bis[4,4 0 -bis(trimellityimido)phenyl]-2-propenone 6 with six hydantoin derivatives 7a-f in a medium consisting of triphenyl phosphite, calcium chloride, pyridine, and N-methyl-2-pyrrolidone. The polycondensation reaction produced a series of novel poly(amid-imide)s 8a-f in high yields with inherent viscosities between 0.26 and 0.42 dL/g. The resulting polymers were characterized by elemental analysis, viscosity measurements, solubility test, thermo gravimetric analysis (TGA and DTG), FTIR, and UV-Vis spectroscopy. 1,3-bis[4,4 0 -bis(trimellityimido)phenyl]-2-propenone 6 was prepared from a three-step reaction by using 4-nitro benzaldehyde 1 and 4-nitro acetophenone 2 as precursors.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.