A new series of segmented copolymers were synthesized from poly(ethylene terephthalate) (PET) oligomers and poly(ethylene glycol) (PEG) by a two-step solution polymerization reaction. PET oligomers were obtained by glycolysis depolymerization. Structural features were defined by infrared and nuclear magnetic resonance (NMR) spectroscopy. The copolymer composition was calculated via H-1 NMR spectroscopy. The content of soft PEG segments was higher than that of hard PET segments. A single glass-transition temperature was detected for all the synthesized segmented copolymers. This observation was found to be independent of the initial PET-to-PEG molar ratio. The molar masses of the copolymers were determined by gel permeation chromatography (GPC). (C) 2004 Wiley Periodicals, Inc.