Poly(lactic acid) nanocomposites with improved impact and thermal properties

PLA nanocomposites containing 2wt% of OMMT clay were prepared using twin screw extruder followed by injection moulding. EPR-g-MAH (5-20phr) was used to improve the impact properties of PLA/OMMT nanocomposites. The mechanical properties of PLA nanocomposites were studied through tensile, flexural and impact tests. The morphology and dispersion of OMMT were examined using TEM and XRD. The thermal properties were characterised using differential scanning calorimetry and thermogravimetric analysis. The impact strength and thermal stability of the PLA/OMMT nanocomposites were improved significantly in the presence of EPR-g-MAH. The degree of crystallinity of PLA/OMMT was influenced by the loading of EPR-g-MAH. TEM and XRD results revealed the formation of PLA nanocomposites as the OMMT was exfoliated in the presence of EPR-g-MAH.