摘要

To overcome the drawback of poly(beta-hydroxybutyrate) (PHB) and obtain some useful new materials based on PHB, a new ABA type triblock copolymer of PS-PHB-PS has been successfully synthesized by ATRP (atom transfer radical polymerization) method with Br-PHB-Br as macroinitiator, styrene as monomer and CuBr/PMDETA (NNN',N",N"-pentamethyldiethylenetriamine) as the catalyst system. The chain architectures of the triblock copolymers were confirmed by the H-1 NMR and C-13 NMR spectra. SEC (size exclusion chromatography) analysis was used to estimate the molecular weight characteristics and the lengths of the PHB and PS blocks of the copolymers. The molecular weight M-p was increased linearly with conversion and these triblock copolymers showed relatively narrow polydispersities, indicating that the system displayed characteristics of a living radical polymerization. The obtained triblock copolymers had good biocompatibility and better thermal properties than those of PHB homopolymer.