Particleboards bonded by an imidazole-based adhesive system

Scharf, Alexander (author), Popescu, Carmen-Mihaela (author), Dernegård, Henric (author), Oja, Johan (author), Ormondroyd, Graham Alan (author), Medved, Sergej (author), Sandberg, Dick (author), Jones, Dennis (author)

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.

• Language: English
• Keywords: adhesion, citric acid, esterification, ionic liquids, wood composite
• Typology: 1.01 - Original Scientific Article
• Organization: BF - Biotechnical Faculty
• Publication version: Version of Record
• Publication date: 01.01.2023
• Year: 2023
• Number of pages: 19 str.
• Numbering: Vol. 16, iss. 22
• PID: 20.500.12556/RUL-152884
• UDC: 630*8
• ISSN on article: 1996-1944
• DOI: 10.3390/ma16227201
• COBISS.SI-ID: 176783875
• Publication date in RUL: 11.12.2023

Record is a part of a journal

• Title: Materials
• Shortened title: Materials
• Publisher: MDPI
• ISSN: 1996-1944
• COBISS.SI-ID: 33588485

Licences

• License: CC BY 4.0, Creative Commons Attribution 4.0 International
• Link: http://creativecommons.org/licenses/by/4.0/
• Description: This is the standard Creative Commons license that gives others maximum freedom to do what they want with the work as long as they credit the author.

Secondary language

• Language: Slovenian
• Keywords: lepljenje, citronska kislina, esterifikacija, ionske tekočine, lesni kompoziti

Projects

• Funder: Other - Other funder or multiple funders
• Project number: 0
• Name: CT WOOD

• Funder: Other - Other funder or multiple funders
• Project number: 2022- 00998
• Name: Multifunktionella byggskivor av sågspån