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- Title
Particleboards Bonded by an Imidazole-Based Adhesive System.
- Authors
Scharf, Alexander; Popescu, Carmen-Mihaela; Dernegård, Henric; Oja, Johan; Ormondroyd, Graham; Medved, Sergej; Sandberg, Dick; Jones, Dennis
- Abstract
Particleboards with different combinations of the adhesive material imidazole, citric acid, and sorbitol were produced. Softwood sawdust from a Swedish sawmill was mixed with an aqueous solution of the chemicals and then dried to 0% moisture content prior to pressing. The boards were pressed to a target density of 700 kg m−3 at either 200 °C or 220 °C for 10 min. The hygroscopic and mechanical properties of the boards were clearly better at 220 °C than 200 °C for all used chemical combinations. A combination of imidazole (14.4 wt%) and citric acid (11.3 wt%) led to the best results, where the thickness swelling after 24 h of water immersion was 6.3% and the internal bonding strength was 0.57 MPa. The modulus of rupture and modulus of elasticity were 3.3 MPa and 1.1 GPa, respectively. Cyclic accelerated weathering showed exceptional stability with a thickness change after boiling and drying of only 2.1% compared to the initial dry thickness. This study indicates that the presence of imidazole leads to greatly improved hygroscopic properties and good internal bonding strength when used in particleboards.
- Subjects
PARTICLE board; IMIDAZOLES; ADHESIVES; FLEXURAL strength; WATER immersion; CITRIC acid; WOOD waste
- Publication
Materials (1996-1944), 2023, Vol 16, Issue 22, p7201
- ISSN
1996-1944
- Publication type
Article
- DOI
10.3390/ma16227201