Development of nanocellulose-based high gas barrier composites for packaging
Résumé
Polylactide (PLA) presents the advantage of being a biodegradable and renewable polyester with overall good mechanical properties, which makes it an interesting substitute for classical non-renewable polymers. However, PLA has limited gas barrier characteristics, property of greatest importance for packaging applications. Cellulose Nanocrystals (CNC) is known for it’s high crystallinity, as well as the ability to form percolation networks in polymeric matrices, which was proven in previous studies, to be both beneficial for barrier and mechanical properties. In this work, nanocellulose-based composites were prepared via solvent casting. The effects of unmodified and modified nanocellulose particles on the relaxation and barrier properties of PLA were investigated. The adhesion between the matrix and the filler was enhanced after chemical modification, as well as the barrier properties to oxygen (for high contents).
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