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Field emission scanning electron microscopy (FESEM) images of the fracture surfaces of the polylactide (PLA) films with different weight contents (wt%) of oligomer of lactic acid (OLA): (a) PLA; (b) PLA + 5 wt% OLA; (c) PLA + 10 wt% OLA; (d) PLA + 20 wt% OLA. Images were taken at 2000× showing scale markers of 2 µm.
