SEM micrographs of A,B) PLA, C,D) E0000, E,F) E1001 (1k), G,H) E2502 (2k), I,J) E5005 (2k) films before sterilization (upper panel) and after EO sterilization under severe condition (lower panel). Surface cracks were observed only on TyrPC films. [Scale bar = 10 µm].