In this research, polylactic acid /SiO2/AlO composite films were elaborated using a casting method. The morphology, microstructure, and optical properties of the PLA and composite films were investigated. The optical microscopy images show that SiO2 and AlO were homogeneously dispersed in the PLA matrix. AFM images show in the case of pure PLA, the surface appeared smoother in comparison to the composite films, which have rough surfaces. The results of the ATR spectroscopy show, that the PLA/SiO2 /AlO composite films contain the functional groups of Si-O-Si, Si-OH, and Al-OH due to the nucleating effect of SiO2 and AlO particles with the PLA matrix. The XRD result shows that PLA has a semi-crystalline structure. The presence of AlO particles in the PLA matrix did not affect its semi-crystalline structure, while the addition of the SiO2 and SiO2/AlO particles increases the formation of the crystal phase. As a result, the crystallinity of the PLA is improved.
