4Carothers W H. Polymerization [J]. Chem Rev, 1931, 8 (3) : 353 -426.
5Nikolic M S, ojonlagic J. Synthesis and characterization of bi- odegradable poly (butylene suecinate-CO - butylenefumar- ate) s [J]. PolynlerDegradation and Stability, 2001, 74 (2) : 263 -270.
6Giorgio Montaudo, Paola Rizzarelli. synthesis and enzymatic degradation of aliphatic copolyesters [ J ]. Polymer Degrada- tion and Stability, 2006. 70:305-314.