In our opinion, the ENR50 molecules with higher epoxidation content generate more hydroxyl function with the carbonyl groups of PLA via hydrogen bonding during the melt blending, which trigger greater crosslinking of the macromolecular chains between rubber and PLA. For the ENR20/PLA blends, the torque values are lower than that of pure PLA. This may be that ENR20 with a small amount of epoxy groups performs plasticization to PLA and leads to the blends with elastic and flexible feature