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Open AccessArticle

Development of Bilayer Biodegradable Composites Containing Cellulose Nanocrystals with Antioxidant Properties

1
Center of Innovation in Packaging (LABEN), University of Santiago de Chile (USACH), Technology Faculty, Santiago 9170201, Chile
2
CEDENNA (Center for the Development of Nanoscience and Nanotechnology), Santiago 9170124, Chile
*
Author to whom correspondence should be addressed.
Polymers 2019, 11(12), 1945; https://doi.org/10.3390/polym11121945
Received: 3 October 2019 / Revised: 13 November 2019 / Accepted: 22 November 2019 / Published: 26 November 2019
(This article belongs to the Special Issue Cellulose and Renewable Materials)
The interest in the development of novel biodegradable composites has increased over last years, and multilayer composites allow the design of materials with functionality and improved properties. In this work, bilayer structures based on a coated zein layer containing quercetin and cellulose nanocrystals (CNC) over an extruded poly(lactic acid) (PLA) layer were developed and characterized. Bilayer composites were successfully obtained and presented a total thickness of approx. 90 µm. The coated zein layer and quercetin gave a yellowish tone to the composites. The incorporation of the zein layer containing CNC decreased the volatile release rate during thermal degradation. Regarding to mechanical properties, bilayer composites presented lower brittleness and greater ductility evidenced by a lower Young’s modulus and higher elongation values. Water permeability values of bilayer composites greatly increased with humidity and the zein coated layer containing quercetin increased this effect. Experimental data of quercetin release kinetics from bilayer structures indicated a higher release for an alcoholic food system, and the incorporation of cellulose nanocrystals did not influence the quercetin diffusion process.
Keywords: poly(acid lactic), bilayer; zein; active packaging; quercetin; cellulose nanocrystals poly(acid lactic), bilayer; zein; active packaging; quercetin; cellulose nanocrystals
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MDPI and ACS Style

Velásquez, E.; Rojas, A.; Piña, C.; Galotto, M.J.; López de Dicastillo, C. Development of Bilayer Biodegradable Composites Containing Cellulose Nanocrystals with Antioxidant Properties. Polymers 2019, 11, 1945.

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