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Effect of the Pyro-Gasification Temperature of Wood on the Physical and Mechanical Properties of Biochar-Polymer Biocomposites

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Ayadi, Ramzi, Koubaa, Ahmed, Braghiroli, Flavia, Migneault, Sébastien, Wang, He et Bradai, Chedly (2020). Effect of the Pyro-Gasification Temperature of Wood on the Physical and Mechanical Properties of Biochar-Polymer Biocomposites. Materials , 13 (6). p. 1327. doi:10.3390/ma13061327 Repéré dans Depositum à https://depositum.uqat.ca/id/eprint/1107

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Résumé

The physical and mechanical properties of wood (WPC) and biochar polymer composites (BPC) obtained at different pyro-gasification temperatures and different fiber proportions were investigated. Composite pellets made from wood chips or biochar and thermoplastic polymers (polypropylene or high-density polyethylene) were obtained by twin-screw extrusion, and test specimens were prepared by injection molding. Results showed that BPCs were more dimensionally stable compared to WPCs, but their mechanical properties decreased with increasing pyro-gasification temperatures due to the poor adhesion between the polymer and biochar. Indeed, FTIR investigations revealed the decrease or absence of hydroxyl groups on biochar, which prevents the coupling agent from reacting with the biochar surface. The change in the biochar chemical structure led to an improvement in the dimensional stability and hydrophobicity of the biocomposites. Despite the increased dimensional stability of BPCs compared to WPCs, BPCs still adsorb water. This was explained by the surface roughness and by the biochar agglomerations present in the composite. In conclusion, the thermochemical conversion of black spruce wood chips into biochar makes it brittle but more hydrophobic, thereby reducing the wettability of the BPCs.

Type de document: Article
Informations complémentaires: Licence d'utilisation : CC-BY 4.0
Mots-clés libres: Biochar; Biocomposites; Hydrophobicity; Physical and mechanical properties; Pyro-gasification
Divisions: Forêts
Génie
Date de dépôt: 08 mai 2020 17:31
Dernière modification: 08 mai 2020 17:31
URI: https://depositum.uqat.ca/id/eprint/1107

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