Figure 4.

Schematic of GO promoting the degradation of PLLA. GO accelerated the degradation of PLLA could be divided into three parts. a₁: Hydrophilic GO attracted water molecules. a₂: The interface channels between GO and PLLA facilitated the intrusion of water molecules and discharged of degraded low molecular products. a₃: The hydrogen bonding between PLLA and GO induced the ester bond to deflect toward the interfaces, making the water molecules easily to attack the ester bond.