Anti-/pro-oxidant concentration-dependent activity of natural phenolic compounds in bio-polyesters

Polylactic acid (PLA) is a biodegradable bio-based polyester of increasing industrial interest because of its unique properties, such as low toxicity, bio- and eco-compatibility. Indeed, PLA is a suitable material for several “green” applications in different fields, among other food packaging, textile fibres and biomedical devices [1]. PLA performances, in terms of durability, are limited by several chemical aging mechanisms, such as thermal decomposition, hydrolysis, photo-oxidation, natural weathering and thermo-oxidation at high temperature [2]. Therefore, to avoid the decay of its physical and mechanical properties, the addition of anti-oxidants and/or light stabilizers is imperative. …