Hierarchical materials based on nanocellulose and poly(lactic acid)
Résumé
Nanocelluloses, i.e. cellulose nanocrystals (CNC) and cellulose nanofibrils (CNF), have shown excellent gas barrier properties which makes them of the highest interest for food packaging applications1. However, the nanocelluloses swelling, in presence of water vapor, thwarts their good gas barrier properties2. Consequently, the use of nanocelluloses in food packaging, while extremely promising, is still a challenge. A multilayer architecture starting with an hydrophobic layer of poly(lactic acid) (PLA) could be a solution to protect nanocelluloses. Different studies have been devoted to the use of nanocelluloses as fillers in a PLA matrix3, but here, a new architecture was developed by depositing layers of nanocelluloses on PLA. The effect of nanocelluloses coating on O2 barrier properties and water vapor barrier properties was studied, as well as the organization of the nanocellulose layers (Fig.1). Very promising results were obtained, with O2 permeation several orders of magnitude lower than PLA, thus validating this innovative process.
Origine : Fichiers produits par l'(les) auteur(s)