Carbon dioxide is the primary contamination in the atnlosphere．In order to reduce the pollution caused by CO2

some methods have been developed to use CO2 as the raw material to produce degradable polymeric materials A new aliphatic polycarbonate (PPCG) was successfully synthesized with terpolymerization of carbon dioxide

propylene oxide(PO)and γ-butyrolaetone (GBL)．The copolymer was characterized bymeans of FTIR

1H-NMR and 13C-NMR．The results showed that the ring of GBL was opened and inserted into the chain of PO-CO2． GBL offered an ester structural unit making the copolymer easier to be hydmlyzed．The intrinsic viscosity

viscosity-average molecular weight (Mv)

and glass-transition temperature(Tg) of eopolymers were determined．PPCG exhibited a Tg of around 40％

whichis higher than that of PPC The influence of reaction time and ratio of PO：GBL (mol／mol) on Mv and Tg of copolymer were tested The increase of reaction time may result in higher Mv and Tg.The total weight loss was used to characterize the degradation ability in hydmlysis tests．It was concluded that eopolymers of high GBL content exhibited good degradabilidy．