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Field emission scanning electron microscopy (FESEM) images of the fracture surfaces of the polylactide (PLA) films containing 20 wt% of oligomer of lactic acid (OLA) and different parts per hundred resin (phr) of halloysite nanotubes (HNTs): (a) PLA; (b) PLA + 20 wt% OLA + 3 phr HNTs; (c) PLA + 20 wt% OLA + 6 phr HNTs; (d) PLA + 20 wt% OLA + 9 phr HNTs. Images were taken at 5000× with scale markers of 2 µm.
