Cogrinding Wood Fibers and Tannins: Surfactant Effects on the Interactions and Properties of Functional Films for Sustainable Packaging Materials

André L. Missio, Bruno D. Mattos, Caio G. Otoni, Marina Gentil, Rodrigo Coldebella, Alexey Khakalo, Darci A. Gatto, Orlando J. Rojas

Research output: Contribution to journalArticleScientificpeer-review

25 Citations (Scopus)

Abstract

We report on the combination of cellulose nanofibrils (CNFs) and condensed tannins from Acacia mearnsii for the development of hybrid, functional films. The tannins are fractionated and concentrated in polyphenolics that are used for functional components in the hybrid materials. Cogrinding of wood fibers with the tannins in aqueous media allows simultaneous fiber deconstruction and in situ binding of tannins on the freshly exposed cellulosic surfaces. Hence, a tightly bound bicomponent system is produced, which is otherwise not possible if typical adsorption protocols are followed, mainly due to the extensive hydration typical of CNFs. A nonionic surfactant is used to tailor the cellulose-tannin interactions. The proposed strategy not only enables the incorporation of tannins with CNFs but also endows a high and prolonged antioxidant effect of films formed by filtration. Compared to tannin-free films, those carrying tannins are considerably more hydrophobic. In addition, they show selective absorption of ultraviolet light while maintaining optical transparency in the visible range. The proposed simple protocol for incorporating tannins and surfactants with CNFs is suitable to produce functional materials. This is possible by understanding associated interfacial phenomena in the context of sustainable materials within the concept of the circular bioeconomy.
Original languageEnglish
Pages (from-to)1865-1874
JournalBiomacromolecules
Volume21
Issue number5
DOIs
Publication statusPublished - 11 May 2020
MoE publication typeA1 Journal article-refereed

Funding

This research was undertaken, in part, thanks to funding from the European Research Council (ERC) under the European Union’s Horizon 2020 Research and Innovation Programme (ERC Advanced Grant agreement 788489, “BioElCell”) and the Canada Excellence Research Chairs Program (Canada). We are also grateful to the Brazilian National Council for Scientific and Technological Development (CNPQ; Grant 167388/2017-7), the Brazilian Coordination for the Improvement of Higher Education Personnel (CAPES) under the Science Without Borders Program (Grant 88881.068144/2014-01) and Canada Foundation for Innovation.

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