Synthesis and characterization of novel polyesters derived from 4-aryl-2,6-bis(4-chlorocarbonyl phenyl) pyridines and various aromatic diols

A new class of aromatic polyesters containing pyridine heterocyclic rings (PE_1-15) was prepared via reactions of 4-aryl-2,6-bis(4-chlorocarbonyl phenyl) pyridines (DAC_1-3) and commercial diols by high temperature solution polymerization method in o-dichlorobenzene and catalytic amount of triethylamine hydrochloride. The optimum condition of polymerization was obtained via study of a model compound prepared from reaction of 4-phenyl-2,6-bis(4-chlorocarbonylphenyl) pyridine (DAC₁) and phenol. All polymers were characterized by FTIR and ¹H-NMR spectroscopies, and their physical properties including solution viscosity, solubility properties, thermal stability and thermal behavior were studied. The prepared polyesters showed excellent thermal stability and good solubility in polar aprotic solvents.