Effect of the Recycling and Annealing on the Mechanical and Fracture Properties of Poly(Lactic Acid)

Abstract

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Effects of Aging and Different Mechanical Recycling Processes on the Structure and Properties of Poly(lactic acid)-clay Nanocomposites

“…The first heating scans presented in Fig. 3 reveal that all the samples present a glass transition around 60 °C, followed by an endothermic peak related to the densification of the amorphous regions of PLA, that is, the physical aging of the polymer [20]. The samples also show a cold crystallization peak (T cc ) at approximately 110 °C and finally, a double peak melting endotherm (T m1 and T m2 ) near 150 °C.…”

“…For instance, Scaffaro et al [17], Badía et al [18] and Żenkiewicz et al [19] reported that PLA presented reduced mechanical properties after 1, 5 and 10 reprocessing cycles. However, Nascimento et al [20] pointed out that a single reprocessing step does not significantly affect the structure, thermal and mechanical properties of PLA.…”

Perspective on Polylactic Acid (PLA) based Sustainable Materials for Durable Applications: Focus on Toughness and Heat Resistance

“…The crystallinity of PLA has been found to increase consistently through annealing in most of the studies and the increase lead to an improvement in its heat resistance and overall mechanical performance. Park et al 90 and Nascimento et al 91 performed annealing of PLA under various conditions to obtain microstructures with different spherulite sizes and densities. The heat resistance of PLA was markedly improved when its crystallinity was increased by annealing.…”

Structure-properties relationships in melt reprocessed PLA/hydrotalcites nanocomposites

“…PLA is susceptible to thermo-degradation during melt processing operations [20,21]. For this purpose, the study of thermo-mechanical degradative phenomena associated to its re-processing [20,22,23] is of great concern in order to assess the possibility of recycling PLA-based nanocomposites. To enhance some properties of PLA, such as mechanical and gas barrier properties and to extend its use in food packaging applications, small amounts of nanoparticles can be loaded in the matrix [24].…”