Crystalline and dynamic mechanical behaviors of synthesized poly(sebacic anhydride-co-ethylene glycol)

A novel biomaterial: poly(sebacic anhydride-co-ethylene glycol) was synthesized by introducing poly(ethylene glycol) (PEG) into a polyanhydride system. This copolymer was synthesized using sebacic acid and PEG via melt-condensation polymerization. The crystalline behavior of these synthesized products was studied, and compared to that of polymer blends of poly(sebacic anhydride) (PSA) and PEG. The crystallinity of PSA chain segments can be significantly enhanced by increasing chain mobility via the introduction of PEG. The crystallinity of the PSA component in copolymers was substantially greater than that of blends. However, the crystalline growth of the PEG segments was totally hindered by the presence of PSA chain segments, such that no crystal for PEG component was found in these copolymers. Besides, a dynamic mechanical analysis of these materials was also performed to provide additional information concerning visco-elastic behavior for other biomedical applications, where it was found that the viscous behavior in copolymers was more significant than in neat PSA and PEG.