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Abstract
The dimensional stabilisation of wood using thermosetting resins relies on the resin uptake into the cell walls. This study tested if a conditioning step after the impregnation and before the final heat-curing enhances the cell wall uptake to improve dimensional stabilisation without increasing the chemical consumption. Small blocks of Scots pine sapwood were vacuum-impregnated with an aqueous melamine formaldehyde solution and conditioned at 33, 70, or 95 % RH for up to 1 week before drying and curing the blocks at 103 °C. However, the conditioning step decreased the cell wall bulking and the moisture exclusion effect compared to the immediate heat curing of the impregnated samples. Analyses of the resin-treated samples by scanning electron microscopy, IR spectroscopy and confocal Raman microspectroscopy provided evidence of wood hydrolysis and polycondensation of the resin within the cell lumen during the conditioning step. Hydrolysis and removal of wood constituents may have counterbalanced the cell wall bulking of the resin. Polycondensation of the resin in the lumen increased its molecule size, which could have hindered the cell wall diffusion of the resin.
Original language | English |
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Pages (from-to) | 37-46 |
Number of pages | 10 |
Journal | Holzforschung |
Volume | 78 |
Issue number | 1 |
Early online date | 24 Nov 2023 |
DOIs | |
Publication status | Published - 1 Jan 2024 |
MoE publication type | A1 Journal article-refereed |
Keywords
- thermosetting resin
- vibrational spectroscopy
- water vapour sorption
- wood modification
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Dive into the research topics of 'Impact of a conditioning step during the treatment of wood with melamine-formaldehyde resin on dimensional stabilisation'. Together they form a unique fingerprint.Projects
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WATERWOOD: Water vapour sorption behaviour of wood under load
Rautkari, L. (Principal investigator), Altgen, M. (Project Member), Awais, M. (Project Member), Arabzadeh, V. (Project Member), Vergara Lourencon, T. (Project Member), Valkonen, M. (Project Member) & Collins, S. (Project Member)
01/09/2021 → 31/08/2025
Project: Academy of Finland: Other research funding
Equipment
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OtaNano - Nanomicroscopy Center
Seitsonen, J. (Manager) & Rissanen, A. (Other)
OtaNanoFacility/equipment: Facility
Press/Media
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Data from Aalto University Broaden Understanding of Aldehydes (Impact of a conditioning step during the treatment of wood with melamine-formaldehyde resin on dimensional stabilisation)
Rautkari, L. & Awais, M.
12/12/2023
1 item of Media coverage
Press/Media: Media appearance