Behavior of Polylactide Montmorillonite Nanocomposites

Polylactide (PLA) is one of the most essential biopolymeric material thanks to its renewability, biodegradability and biocompatibility. PLA has significant commercial use in food packaging industry and biomedical applications. However, it has not taken place yet in engineering applications when compared with traditional petroleum-based polymers because of its insufficient mechanical and thermal properties. The purpose of this study was to overcome these problems by using nanocomposite approach. In this manner, the influences of montmorillonite (MMT) type nanoclay addition and maleic anhydride (MA) grafted polylactide copolymer compatibilization were investigated on the thermal and mechanical behaviors of PLA. Nanocomposites have been compounded by melt mixing method via twin-screw extruder. After compounding, injection molding method has been used for shaping of bulk nanocomposite specimens. Intercalation and exfoliation level of the PLA/clay nanocomposites were examined by XRD method and TEM analysis. FTIR spectrums have been used for possible chemical interactions. Tensile tests, bending tests and fracture toughness tests have been used to investigate mechanical properties of PLA nanocomposites. Besides, changes in the transition temperatures and thermal degradation temperatures of PLA were observed in DSC and TGA thermal analyses. It was basically concluded that use of MMT nanocomposite approach could lead to significant improvements in many properties of PLA.
Citation Formats
B. Sarı and C. Kaynak, “Behavior of Polylactide Montmorillonite Nanocomposites,” 2016, Accessed: 00, 2020. [Online]. Available: