Bio-based composite of stereocomplex polylactide and cellulose nanowhiskers

The advanced bio-based composite of stereocomplex polylactide containing cellulose nanowhiskers was successfully prepared by supercritical fluid technology. This bio-stereocomplex-nanocomposite material was produced by stereocomplexation of polylactide-graftcellulose nanowhishkers through supercritical carbon dioxide-dichloromethane at 65 °C and 350 bar. The bio-stereocomplex-nanocomposite polylactide was obtained in high stereocomplex degree (100%). The bio-stereocomplex-nanocomposite polylactide exhibits excellent stereocomplex memory which is the main limitation of linear stereocomplex polylactide. It also shows improvement in mechanical properties up to 2.70 GPa (Young's modulus) and thermal degradation temperature. The combination of stereocomplex and nanocomposite approaches offers simultaneous improvement on physical properties. The bio-stereocomplex-nanocomposite polylactide is promising material in the future to replace petroleum-based polymer as eco-friendly materials.