Particleboards Bonded by an Imidazole-Based Adhesive System
Allbwn ymchwil: Cyfraniad at gyfnodolyn › Erthygl › adolygiad gan gymheiriaid
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Yn: Materials, Cyfrol 16, Rhif 22, 7201, 17.11.2023.
Allbwn ymchwil: Cyfraniad at gyfnodolyn › Erthygl › adolygiad gan gymheiriaid
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TY - JOUR
T1 - Particleboards Bonded by an Imidazole-Based Adhesive System
AU - Scharf, Alexander
AU - Popescu, Carmen-Mihaela
AU - Dernegard, Henric
AU - Oja, Johan
AU - Ormondroyd, Graham
AU - Medved, Sergej
AU - Sandberg, Dick
AU - Jones, Dennis
PY - 2023/11/17
Y1 - 2023/11/17
N2 - 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 m3 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.
AB - 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 m3 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.
U2 - 10.3390/ma16227201
DO - 10.3390/ma16227201
M3 - Article
C2 - 38005130
VL - 16
JO - Materials
JF - Materials
SN - 1996-1944
IS - 22
M1 - 7201
ER -