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首页> 外文期刊>Holzforschung >Dynamic moisture sorption and dimensional stability of furfurylated wood with low lignin content
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Dynamic moisture sorption and dimensional stability of furfurylated wood with low lignin content

机译：低木质素含量糠醛木料的动态水分吸附和尺寸稳定性

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摘要

Degradation of lignin occurs naturally in wood due to the influence of microorganisms or photic radiation. To improve the properties of wood with low lignin content, furfuryl alcohol (FA) at the concentration of 25% was used to modify poplar wood (Populus euramericana Cv.) after partial delignification. Moisture sorption and dimensional stability of the samples were investigated under dynamic conditions where the relative humidity (RH) was changed sinusoidally between 45% and 75% at 25 degrees C. Both the moisture content (MC) and the tangential dimensional change varied with a sinusoidal shape similar to the RH. Hygroscopicity and hygroexpansion increased after delignification, while furfurylation led to an inverse impact by reducing MC, dimensional changes, amplitudes of MC and dimensional changes, moisture sorption coefficient (MSC), and humidity expansion coefficient (HEC). After delignification and further furfurylation, the MC and the dimensional changes were reduced by about 20%, and the maximum drop in amplitudes of MC and dimensional changes was about 30%, while the MSC and the HEC decreased by over 15%. In addition, the furfurylated wood with low lignin content exhibited lower sorption hysteresis and swelling hysteresis.
机译：由于微生物或光辐射的影响，木质素在木材中自然发生降解。为了改善木质素含量低的木材的性能，部分去木质素后，使用浓度为25％的糠醇（FA）改性杨木（Populus euramericana Cv。）。在动态条件下研究样品的水分吸附和尺寸稳定性，动态条件是在25摄氏度下相对湿度（RH）在45％至75％之间呈正弦变化。水分含量（MC）和切向尺寸变化均随正弦变化形状类似于RH。脱木素后，吸湿性和湿膨胀性增加，而糠醛化则通过降低MC，尺寸变化，MC的振幅和尺寸变化，吸湿系数（MSC）和湿度膨胀系数（HEC）产生相反的影响。经过脱木素化和进一步糠醛化后，MC和尺寸变化降低了约20％，MC和尺寸变化幅度的最大下降约30％，而MSC和HEC降低了15％以上。另外，木质素含量低的糠醛化木材表现出较低的吸附滞后和溶胀滞后。

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