Robust Wood Sawdust/Microfibrous Cellulose Composite Board Cross-Linked by Phosphoric Acid-Activated Glutaraldehyde
- 1 April 2023
- journal article
- research article
- Published by American Scientific Publishers in Journal of Biobased Materials and Bioenergy
- Vol. 17 (2), 225-231
- https://doi.org/10.1166/jbmb.2023.2261
Abstract
The recycling use of wood sawdust to process composite boards has received much attention in recent years. To avoid the use of chemical adhesives, natural cellulose-based materials were often used as adhesives to combine wood sawdust. Rather than utilizing nanocellulose, the report herein describes a method to prepare a robust composite board that is based on microfibrous cellulose, which is a low-cost commercial product. To effectively cross-link wood sawdust and microfibrous cellulose, phosphoric acid-activated glutaraldehyde was used as catalyst. Compared to its uncross-linked counterpart, the modulus of elasticity and modulus of rupture of the composite board that had been cross-linked by glutaraldehyde and phosphoric acid were significantly strengthened to 3.45±0.06 GPa and 36.5±3.5 MPa, respectively. Moreover, the moisture resistance of the cross-linked composite board was also enhanced. After soaking in water for 24 h, the mass swelling ratio and thickness swelling ratio of cross-linked composite board had only changed 49% and 21%, respectively. These performances even exceeded that of composite board prepared from nanocellulose. The method described in this work may have applications in commercial processing and the recycling of wood sawdust.Keywords
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