Bradai Hamza, Koubaa Ahmed, Zhang Jingfa, Demarquette Nicole R
Forest Research Institute, University of Quebec in Abitibi-Témiscamingue, Rouyn-Noranda, QC J9X 5E4, Canada.
State Key Laboratory of Biobased Material and Green Papermaking, Qilu University of Technology Shandong Academy of Sciences, Jinan 250300, China.
Polymers (Basel). 2024 Aug 31;16(17):2493. doi: 10.3390/polym16172493.
This study explores lignin-retaining transparent wood biocomposite production through a lignin-modification process coupled with epoxy resin. The wood's biopolymer structure, which includes cellulose, hemicellulose, and lignin, is reinforced with the resin through impregnation. This impregnation process involves filling the voids and pores within the wood structure with resin. Once the resin cures, it forms a strong bond with the wood fibers, effectively reinforcing the biopolymer matrix and enhancing the mechanical properties of the resulting biocomposite material. This synergy between the natural biopolymer structure of wood and the synthetic resin impregnation is crucial for achieving the desired optical transparency and mechanical performance in transparent wood. Investigating three distinct wood species allows a comprehensive understanding of the relationship between natural and transparent wood biocomposite properties. The findings unveil promising results, such as remarkable light transmittance (up to 95%) for Aspen transparent wood. Moreover, transparent wood sourced from White Spruce demonstrates excellent stiffness (E = 2450 MPa), surpassing the resin's Young's modulus. Also, the resin impregnation enhanced the thermal stability of natural wood. Conversely, transparent wood originating from Larch showcases superior impact resistance. These results reveal a clear correlation between wood characteristics such as density, anatomy, and mechanical properties, and the resulting properties of the transparent wood.
本研究通过木质素改性工艺与环氧树脂相结合来探索保留木质素的透明木材生物复合材料的生产。木材的生物聚合物结构，包括纤维素、半纤维素和木质素，通过浸渍用树脂增强。这种浸渍过程包括用树脂填充木材结构中的空隙和孔隙。一旦树脂固化，它就与木纤维形成牢固的结合，有效地增强生物聚合物基体并提高所得生物复合材料的机械性能。木材的天然生物聚合物结构与合成树脂浸渍之间的这种协同作用对于在透明木材中实现所需的光学透明度和机械性能至关重要。研究三种不同的木材种类有助于全面了解天然木材与透明木材生物复合材料性能之间的关系。研究结果揭示了一些有前景的结果，例如白杨透明木材具有显著的透光率（高达95%）。此外，白云杉来源的透明木材表现出优异的刚度（E = 2450 MPa），超过了树脂的杨氏模量。而且，树脂浸渍提高了天然木材的热稳定性。相反，落叶松来源的透明木材具有卓越的抗冲击性。这些结果揭示了木材特性（如密度、解剖结构和机械性能）与透明木材所得性能之间的明显相关性。
