Abstract The aim of this investigation was mainly to evaluate the multi-scale distribution of furfuryl alcohol (FA) resin in modified Chinese fir and poplar wood. 13C CP/MAS NMR, Scanning Electron Microscopy (SEM), Confocal Laser Scanning Microscopy (CLSM), Nanoindentation and Imaging Fourier transform infrared microscopy (Imaging FT-IR) were applied to describe the FA resin distribution in wood from bulk to cell wall scale. The results showed that FA resin were mainly located in the cell cavity of Chinese fir tracheids. For poplar, FA resin was mostly deposited in the cavity of fibers and ray cells, while little was found in the adjacent vessels. Lots of pits of wood cells were covered with FA resin which implied a higher risk of drying after wood furfurlation in practical production. Nanoindentation demonstrated that FA resin could easily infiltrate into the wood cell wall because both reduced modulus and hardness of the modified wood cell walls were significantly improved. This conclusion was further supported by the results of imaging FT-IR.

中文翻译：

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制造高度稳定和耐用的糠醛木材料。第二部分：糠醇（FA）树脂在木材中的多尺度分布

摘要 本研究的主要目的是评估糠醇（FA）树脂在改性杉木和杨木中的多尺度分布。应用 13C CP/MAS NMR、扫描电子显微镜 (SEM)、共聚焦激光扫描显微镜 (CLSM)、纳米压痕和成像傅里叶变换红外显微镜 (Imaging FT-IR) 来描述木材中从块体到细胞壁尺度的 FA 树脂分布. 结果表明，FA树脂主要位于杉木管胞的细胞腔内。对于杨树，FA树脂主要沉积在纤维和射线细胞的腔内，而在相邻血管中几乎没有发现。大量的木细胞凹坑被FA树脂覆盖，这意味着在实际生产中木材碎裂后干燥的风险更高。纳米压痕表明 FA 树脂很容易渗透到木材细胞壁中，因为改性木材细胞壁的模量和硬度都得到了显着改善。这一结论得到了 FT-IR 成像结果的进一步支持。