The polyethylene glycol 200 (PEG200) and polyethylene glycol 400 (PEG400) as the fourth monomers were introduced into succinic acid (SA)

1

4-butanediol (BDO)

ethylene glycol (EG).PEG200-PBES and PEG400-PBES copolyesters with different lengths of ether chains were synthesized by melt copolymerization

then solid composite materials were prepared by solution blending copolyesters with modified thermoplastic starch (TPS).The effects of different ether chain lengths on mechanical properties and thermal stability of composite materials were studied

the interactions between PBS

PEG-PBES and TPS in composite systems of different ether chain length were analyzed by adopting molecular dynamics.The results showed that the compatibility of composite systems increased significantly with the increase of ether chain length

the parameter and Emix values of (PEG400-PBES)/TPS composite systems were more close to 0

its cohesive energy density and solubility parameter were greater than those of PBS/TPS and (PEG200-PBES)/TPS composite systems.Therefore

(PEG400-PBES)/TPS composite system has better compatibility.Meanwhile

with the growth of ether chain length

the tensile strength of composite materials was increased from 1.86 MPa to 8.84 MPa and elongation at break was improved from 25.54% to 74.75%.In addition

the temperature of thermo-gravimetric 50% weight loss was increasedfrom 281.68℃ to 310.53℃.