Effect of different nucleating agent on crystallinity and properties of polylactic acid

Polylactide (PLA) is a promising biobased, compostable polymer suitable for replacing petro-derived polymer not just in single use applications but also for durable equipment requiring more demanding technical performances, in particular in terms of mechanical properties and stability. Consequently a better knowledge of the crystallization behavior of PLA and its effects on the mechanical properties is crucial in order to extend its industrial applications, and even for optimization of polymeric matrices to be further used for biocomposite or active packaging production. In the present study, different nucleating agents have been added to PLA during processing by extrusion and injection molding, to tune the percentage of crystallinity, and modulate the mechanical properties. Boron Nitride and nano fillers (Talc, Calcium Carbonate) have been tested as nucleating agents in variable amount. All the additives investigated evidenced a positive effect on increasing in the degree of crystallinity of PLA and, consequently an improvement of its mechanical properties and widening of potential performance.