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https://hdl.handle.net/10316/105227
Title: | Improving the Barrier Properties of Paper to Moisture, Air, and Grease with Nanocellulose-Based Coating Suspensions | Authors: | Mazega, André Tarrés, Quim Aguado, Roberto Pèlach, Maria Àngels Mutjé, Pere Ferreira, Paulo J. T. Delgado-Aguilar, Marc |
Keywords: | Kit rating; air resistance; alginate; barrier properties; minerals; nanocellulose; packaging paper; poly(vinyl alcohol); pullulan; water vapor transmission rate | Issue Date: | 19-Oct-2022 | Serial title, monograph or event: | Nanomaterials | Volume: | 12 | Issue: | 20 | Abstract: | Food packaging manufacturers often resort to lamination, typically with materials which are neither non-biodegradable nor biobased polymers, to confer barrier properties to paper and cardboard. The present work considers a greener solution: enhancing paper's resistance to moisture, grease, and air by aqueous coating suspensions. For hydrophobization, a combined approach between nanocellulose and common esterifying agents was considered, but the water vapor transmission rate (WVTR) remained excessively high for the goal of wrapping moisture-sensitive products (>600 g m-2 d-1). Nonetheless, oil-repellant surfaces were effectively obtained with nanocellulose, illite, sodium alginate, and/or poly(vinyl alcohol) (PVA), reaching Kit ratings up to 11. Regarding air resistance, mineral-rich coatings attained values above 1000 Gurley s. In light of these results, nanocellulose, minerals, PVA, pullulan, alginate, and a non-ionic surfactant were combined for multi-purpose coating formulations. It is hypothesized that these materials decrease porosity while complementing each other's flaws, e.g., PVA succeeds at decreasing porosity but has low dimensional stability. As an example, a suspension mostly constituted by nanocellulose, sizing agents, minerals and PVA yielded a WVTR of roughly 100 g m-2 d-1, a Kit rating of 12, and an air resistance above 300 s/100 mL. This indicates that multi-purpose coatings can be satisfactorily incorporated into paper structures for food packaging applications, although not as the food contact layer. | URI: | https://hdl.handle.net/10316/105227 | ISSN: | 2079-4991 | DOI: | 10.3390/nano12203675 | Rights: | openAccess |
Appears in Collections: | I&D CERES - Artigos em Revistas Internacionais FCTUC Eng.Química - Artigos em Revistas Internacionais |
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