Developing a moisture-stable structural material with high toughness is essential for improving the stability of packaging and building materials. Wood is a pervasive structural material with naturally good mechanical properties. However, insufficient moisture stability and toughness compromises its safety and structural requirements. Herein, we constructed a moisture-stable wood veneer with high toughness by assembling the choline chloride-ethanolamine delignified wood with alkali lignin, followed by hot-pressing to densify the material. Lignin can be assembled into the microchannel of the delignified wood as a filler and binder for reducing molecular transportation and increasing internal bonding. The enhanced tensile strength (582.0 MPa) and strain (3.6%) are accompanied by a significant increase in the toughness to 11.1 MJ/m³, which is 37 times higher than that of natural wood. The excellent mechanical property can be preserved to a large extent after retaining in tropic moisture conditions (38 °C, 90% RH) with retention of 66.2% and 60.8% for tensile strength and toughness, respectively. A stable water contact angle on the surface and limited water adsorption of reconstructed wood indicate a lowered water infiltration velocity, suggesting highly improved moisture stability as needed for structural materials.

开发具有高韧性的防潮结构材料对于提高包装和建筑材料的稳定性至关重要。木材是一种普遍存在的结构材料，具有良好的天然机械性能。然而，水分稳定性和韧性不足会影响其安全性和结构要求。在此，我们通过将氯化胆碱-乙醇胺脱木素木材与碱木质素组装在一起，然后通过热压使材料致密化，构建了一种具有高韧性的防潮木单板。木质素可以作为填料和粘合剂组装到脱木质素木材的微通道中，以减少分子运输并增加内部结合。拉伸强度（582.0 MPa）和应变（3.6%）的提高伴随着韧性的显着提高，达到11.1 MJ/m ³，比天然木材高37倍。在热带潮湿条件（38℃，90％RH）中保留后，可以在很大程度上保留优异的机械性能，拉伸强度和韧性分别保留66.2％和60.8％。重建木材表面稳定的水接触角和有限的水吸附表明水渗透速度降低，这表明结构材料所需的湿度稳定性得到了极大改善。