New aromatic-aliphatic co-polyesters: Effect of the structural characteristic on the thermal properties

Despite progress in the development of biodegradable polyesters,little attention has been given to aliphatic/aromatic copolyesters. therefore,a series of such co-polyesters has been synthesized by polycondensation of hydroxytelechelic poly(e-caprolactone) and bis(2-hydroxyethyl) terephthalate,using a two-step method and a one-step method providing regular and random distributions of starting co-monomers in the co-polyester chains,respectively. the co-polyesters have been characterized by 1h and 13c nmr,uv-visible absorption spectroscopy and sec measurements. the chemical composition of the aliphatic/aromatic co-polyesters strongly influences the material characteristics. even with an identical molar co-monomer composition,the properties of the obtained co-polyesters depended on the synthesis method and therefore on the co-monomer distribution along the polymer chain. the thermal properties of synthesized co-polyesters were studied using dsc and tga,demonstrating the influence of aromatic rings spread along the macromolecular polyester chain.