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The structure and microstructure of PBCGA copolymers after degradation.AbstractBio?based copolymers with excellent mechanical properties and biodegradability are highly desired for packaging and agricultural applications. In this work, a series of high molecular weight bio?based poly(ester?carbonate)s are synthesized using glycolic acid (GA), dimethyl carbonate (DMC), and 1,4?butanediol (BDO). The intrinsic viscosity ([?]) of these copolymers ranges from 0.70 to 1.11 dL/g. The tensile strength, elastic modulus, and elongation at break of PBCGA10 are 19.69?±?2.40?MPa, 151.20?±?37.17?MPa, and 1173?±?142%, respectively, which are superior to the mechanical properties of PBAT. The degradation weight loss of PBCGA10 and PBCGA20 after 30?days can reach 8% and 40%, respectively, indicating excellent degradation performance of the copolymers. Moreover, copolymers undergo degradation through a surface degradation mechanism. The main products of copolymer degradation are BDO, CO2, and H2O, which do not cause harm to organisms and the environment.