Plant cell wall reconstruction towards enhancing moisture stability and toughness by assembling delignified wood with alkali lignin

IF 3.1 2区农林科学 Q1 FORESTRY

Wood Science and Technology Pub Date : 2024-04-21 DOI:10.1007/s00226-024-01552-3

Feng Gu, Xiuxue Niu, Daquan Zhang, Zhaosheng Cai, Wangxia Wang, Junlong Song, Yongcan Jin, Huining Xiao

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Abstract

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.

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通过用碱木质素组装脱木质素木材，重建植物细胞壁以提高水分稳定性和韧性

要提高包装材料和建筑材料的稳定性，就必须开发一种具有高韧性的湿稳定结构材料。木材是一种普遍存在的结构材料，具有天然的良好机械性能。然而，水分稳定性和韧性不足会影响其安全性和结构要求。在这里，我们通过将氯化胆碱-乙醇胺脱木素木材与碱木素组装在一起，然后通过热压使材料致密化，从而制造出具有高韧性的湿度稳定性木皮。木质素可作为填料和粘合剂加入到脱木素木材的微通道中，以减少分子迁移并增加内部粘合力。在提高抗拉强度（582.0 兆帕）和应变（3.6%）的同时，韧性也显著提高，达到 11.1 兆焦耳/立方米，是天然木材的 37 倍。在热带湿度条件（38 °C，90% RH）下保留后，卓越的机械性能仍能在很大程度上得以保留，抗拉强度和韧性的保留率分别为 66.2% 和 60.8%。再造木材表面稳定的水接触角和有限的水吸附性表明其水渗透速度降低，这表明结构材料所需的湿稳定性得到了极大改善。

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来源期刊

Wood Science and Technology 工程技术-材料科学：纸与木材

CiteScore

5.90

自引率

5.90%

发文量

审稿时长

3 months

期刊介绍： Wood Science and Technology publishes original scientific research results and review papers covering the entire field of wood material science, wood components and wood based products. Subjects are wood biology and wood quality, wood physics and physical technologies, wood chemistry and chemical technologies. Latest advances in areas such as cell wall and wood formation; structural and chemical composition of wood and wood composites and their property relations; physical, mechanical and chemical characterization and relevant methodological developments, and microbiological degradation of wood and wood based products are reported. Topics related to wood technology include machining, gluing, and finishing, composite technology, wood modification, wood mechanics, creep and rheology, and the conversion of wood into pulp and biorefinery products.