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PLA/flax fiber bio-composites: effect of polyphenol-based surface treatment on interfacial adhesion and durability.

Bayart, Marie; Adjalle, Kokou D. ORCID logoORCID: https://orcid.org/0000-0002-0836-6395; Diop, Amadou; Ovlaque, Pierre; Barnabé, Simon; Robert, Mathieu et Elkoun, Saïd (2021). PLA/flax fiber bio-composites: effect of polyphenol-based surface treatment on interfacial adhesion and durability. Composite Interfaces , vol. 28 , nº 3. pp. 287-308. DOI: 10.1080/09276440.2020.1773179.

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Résumé

Fiber treatments to enhance interfacial adhesion in natural fiber-reinforced composites generally induce the use of many chemicals. To address this issue, the present work aimed to develop innovative and ecological fiber treatments to produce 100%-green composites, by investigating interfacial adhesion between modified flax fibers and polylactic acid (PLA) using lignin and tannin, two types of eco-friendly polyphenolic compounds derived from waste or paper industry byproducts. The surface modification of flax fibers was performed using a dip-coating method and solutions of condensed tannin or Kraft lignin at different concentrations ranging from 1% to 7% (wt/V). The results showed that the use of coating solutions composed of 1% (wt/V) tannin or lignin significantly improved the interfacial adhesion of composites. Tannin showed better compatibility with PLA and flax fibers with a 17% and 29% increase in the ultimate flexural strength and interlaminar shear strength of the composites, respectively. These results were explained by tannin higher concentration of hydroxyl functions as compared to lignin and thus, good reactivity with cellulose and PLA. Coating solutions rich in lignin or tannin have reduced the mechanical properties of composites due to the thicker coating layers and the migration of lignin or tannin molecules into the PLA bulk.

Type de document: Article
Mots-clés libres: Kraft lignin; condensed tannin; polylactic acid; flax fibers; interfacial adhesion
Centre: Centre Eau Terre Environnement
Date de dépôt: 09 juin 2021 15:28
Dernière modification: 14 févr. 2022 19:23
URI: https://espace.inrs.ca/id/eprint/11466

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