It was reported in recent studies that crystallization of the PLA matrix plays a significant role in the mechanical properties. For example, the impact toughness of PLA/
EGMA (80/20) blends increased by a factor of 10 after annealing at 90 C for 2.5 h upon which the PLA matrix crystallized [20]. Afrifah and Matuana [22] found that the impact toughness of semi-crystalline PLA/EAC blends was higher than that of amorphous PLA/EAC blends.