De Ligne Liselotte, Van Acker Joris, Baetens Jan M, Omar Salah, De Baets Bernard, Thygesen Lisbeth G, Van den Bulcke Jan, Thybring Emil E
Laboratory of Wood Technology (UGent-Woodlab), Department of Environment, Ghent University (UGent), Ghent, Belgium.
Research Unit Knowledge-Based Systems (KERMIT), Department of Data Analysis and Mathematical Modelling, Ghent University (UGent), Ghent, Belgium.
Front Plant Sci. 2022 Jul 14;13:951175. doi: 10.3389/fpls.2022.951175. eCollection 2022.
Moisture performance is an important factor determining the resistance of wood-based building materials against fungal decay. Understanding how material porosity and chemistry affect moisture performance is necessary for their efficient use, as well as for product optimisation. In this study, three complementary techniques (X-ray computed tomography, infrared and low-field NMR spectroscopy) are applied to elucidate the influence of additives, manufacturing process and material structure on the liquid water absorption and desorption behaviour of a selection of wood-based panels, thermally modified wood and wood fibre insulation materials. Hydrophobic properties achieved by thermal treatment or hydrophobic additives such as paraffin and bitumen, had a major influence on water absorption and desorption rates. When hydrophobic additives did not play a role, pore distributions and manufacturing process had a decisive influence on the amount and rate of absorption and desorption. In that case, a higher porosity resulted in a higher water absorption rate. Our results show that there is a clear potential for tailoring materials towards specific moisture performance by better understanding the influence of different material characteristics. This is useful both for achieving desired moisture buffering as well as to increase service life of wood-based materials. From a sustainability perspective, fit-for-purpose moisture performance is often easier to achieve and preferred than wood protection by biocide preservative treatments.
防潮性能是决定木质建筑材料抗真菌腐朽能力的一个重要因素。了解材料孔隙率和化学成分如何影响防潮性能对于其有效利用以及产品优化而言是必要的。在本研究中，应用了三种互补技术（X射线计算机断层扫描、红外光谱和低场核磁共振光谱）来阐明添加剂、制造工艺和材料结构对所选木质板材、热改性木材和木纤维绝缘材料的液态水吸收和解吸行为的影响。通过热处理或石蜡和沥青等疏水添加剂实现的疏水性能对吸水和解吸速率有重大影响。当疏水添加剂不起作用时，孔隙分布和制造工艺对吸收和解吸的量及速率具有决定性影响。在这种情况下，较高的孔隙率会导致较高的吸水率。我们的结果表明，通过更好地理解不同材料特性的影响，有明显的潜力针对特定的防潮性能来定制材料。这对于实现所需的湿度缓冲以及延长木质材料的使用寿命都很有用。从可持续性角度来看，针对特定用途的防潮性能通常比通过杀生剂防腐处理来保护木材更容易实现且更可取。
