Extruded PLA Nanocomposites Modified by Graphene Oxide and Ionic Liquid

Polylactic acid (PLA)-based nanocomposites were prepared by twin-screw extrusion. Graphene oxide (GO) and an ionic liquid (IL) were used as additives separately and simultaneously. The characterization of the samples was carried out by means of Fourier transform infrared (FT-IR) and Raman spectroscopies, thermogravimetric analysis (TGA), and differential scanning calorimetry (DSC). The viscoelastic behavior was determined using dynamic mechanical analysis (DMA) and rheological measurements. IL acted as internal lubricant increasing the mobility of PLA chains in the solid and rubbery states; however, the effect was less dominant when the composites were melted. When GO and IL were included, the viscosity of the nanocomposites at high temperatures presented a quasi-Newtonian behavior and, therefore, the processability of PLA was highly improved.

Automated summary

PLA-based nanocomposites were prepared using twin-screw extrusion with GO and IL as additives. Characterization through various tests showed that IL acted as an internal lubricant increasing PLA chain mobility, while the combination of GO and IL greatly improved the processability of PLA, especially at high temperatures.