Eight types of modified PHB/PET terpolyeaters containing eight types of third monomers are synthesized by melted state copolycondensation. The results show that PHB/PET/VA ter-polyester with vanillic acid has faster copolycondensation rate
lower melting temperature
typical thermotropic liquid crystallinity and better spinnability. Vanillic acid is the third monomer suitable for modifying PHB/PET binary copolyester.