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

被引:25
作者
Ayadi, Ramzi [1 ]
Koubaa, Ahmed [1 ]
Braghiroli, Flavia [2 ]
Migneault, Sebastien [1 ]
Wang, He [1 ]
Bradai, Chedly [3 ]
机构
[1] Univ Quebec Abitibi Temiscaming UQAT, Forest Res Inst, 445 Boul Univ, Rouyn Noranda, PQ J9X 5E4, Canada
[2] Technol Ctr Ind Residues CTRI, Rouyn Noranda, PQ J9X 0E1, Canada
[3] Univ Sfax, Natl Engn Sch Sfax ENIS, Sfax 3038, Tunisia
基金
加拿大自然科学与工程研究理事会;
关键词
biocomposites; pyro-gasification; biochar; physical and mechanical properties; hydrophobicity; FILLER; COMPOSITES; WASTE;
D O I
10.3390/ma13061327
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
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.
引用
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页数:17
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