Schorr Diane, Blanchet Pierre
FPInnovations, 1055 rue du Peps, Quebec City, QC G1V 4C7, Canada.
NSERC Industrial Research Chair on Ecoresponsible Wood Construction (CIRCERB), Forest and Wood Sciences Department, Université Laval, 2425 rue de la Terrasse, Quebec City, QC G1V 0A6, Canada.
Materials (Basel). 2020 Feb 21;13(4):973. doi: 10.3390/ma13040973.
Wood is a living material with a dimensional stability problem. White spruce wood is a Canadian non-permeable wood that is used for siding applications. To improve this property, white spruce wood was treated with organosilanes sol-gel treatment with different moisture content (oven dried, air dried, and green wood). No major morphological changes were observed after treatment. However, organosilanes were impregnated into the cell wall without densifying the wood and without modifying the wood structure. Si-O-C chemical bonds between organosilanes and wood and Si-O-Si bonds were confirmed by FTIR and NMR, showing the condensation of organosilanes. The green wood (41% moisture content) showed only 26% dimensional stability due to the presence of too much water for organosilanes treatment. With a moisture content of 14%-18% (oven dried or air dried wood), the treatment was adapted to obtain the best improvement in dimensional stability of 35% and a 25% reduction of water vapor sorption. Finally, impregnation with organosilanes combined with the appropriate heat treatment improved the dimensional stability of white spruce wood by up to 35%. This treated Canadian wood could be an interesting option to validate for siding application in Canada.
木材是一种存在尺寸稳定性问题的天然材料。白云杉木是一种加拿大产的非渗透性木材，用于壁板应用。为改善这一特性，对白云杉木进行了有机硅烷溶胶 - 凝胶处理，处理时木材具有不同的含水率（烘干、气干和生材）。处理后未观察到明显的形态变化。然而，有机硅烷被浸渍到细胞壁中，并未使木材致密化，也未改变木材结构。通过傅里叶变换红外光谱（FTIR）和核磁共振（NMR）证实了有机硅烷与木材之间的Si - O - C化学键以及Si - O - Si键，表明有机硅烷发生了缩合反应。由于生材（含水率41%）中水分过多，不利于有机硅烷处理，其尺寸稳定性仅提高了26%。当含水率为14% - 18%（烘干或气干木材）时，该处理方式能使尺寸稳定性得到最佳改善，提高了35%，水蒸气吸附量降低了25%。最后，有机硅烷浸渍结合适当的热处理使白云杉木的尺寸稳定性提高了35%。这种经过处理的加拿大木材可能是加拿大壁板应用验证的一个有趣选择。
