Multiscale Engineered Waste Wood Particles toward a Sustainable, Scalable, and High-Performance Structural Material
Multiscale Engineered Waste Wood Particles toward a Sustainable, Scalable, and High-Performance Structural Material
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DOI：
10.1002/adfm.202308361
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发表时间：
2023-11-17
影响因子：
19
通讯作者：
Gan，Wentao
中科院分区：
文献类型：
--
作者：
Dong，Xiaofei;Song，Rui;Gan，Wentao
开发可持续的轻质结构材料是减少交通和建筑碳排放的一项有前途的战略。然而，从可持续的生物质材料生产高性能的散装结构材料，同时保持优异的机械强度仍然是一个重大挑战，特别是对于进一步扩大规模。本文报道了一种可扩展且稳健的自下而上的策略，通过适度脱木质素和原位LiCl/DMAc处理，然后热压，由工程木材颗粒制造具有典型“砖和砂浆”结构的散装木板（W板）。由脱木质素木材颗粒和再生纤维素纳米纤维构建的W‐板可以通过有序的层状结构和多尺度纤维素微/微交联相互作用实现机械增强和增韧的融合，导致高的弯曲强度（225.17 ± 12.18 MPa）和高断裂韧性（4.01 ± 0.53 MPa m0.5），同时保持低密度（1.34 g cm−3），上级典型的金属和陶瓷。此外，W板具有优越的热性能，包括与石油基聚合物相比的低热膨胀系数（<19 × 10− 6 K −1）和高储能模量（>7.5 GPa）。再加上丰富的可再生原材料、全纤维素成分以及可扩展和可回收的制造，W板有可能成为工程应用中高性能、高性价比和环保的替代品。
Developing sustainable and lightweight structural materials is a promising strategy for reducing carbon emissions in transportation and buildings. However, producing high‐performance bulk structural materials from sustainable biomass materials while maintaining excellent mechanical strength remains a major challenge, especially for further scale‐up. Herein, a scalable and robust bottom‐up strategy is reported to fabricate bulk wooden plate (W‐plate) with a typical “brick‐and‐mortar” structure from engineered wood particles via moderate delignification and in situ LiCl/DMAc treatment followed by hot‐pressing. The W‐plate constructed by delignified wood particles and regenerated cellulose nanofibers can achieve a confluence of mechanical strengthening and toughening by the ordered lamination structure and multiscale cellulose micro/nanofiber crosslinking interactions, resulting in high flexural strength (225.17 ± 12.18 MPa) and high fracture toughness (4.01 ± 0.53 MPa m0.5) while maintaining a low density (1.34 g cm−3), superior to typical metals and ceramics. Moreover, the W‐plate exhibits advantageous thermal properties, including a low thermal expansion coefficient (<19 × 10−6K−1) and a high storage modulus (>7.5 GPa) compared to those of petroleum‐based polymers. Coupled with abundant and renewable raw materials, all‐cellulose components, and scalable and recyclable fabrication, the W‐plate can potentially be used as a high‐performance, cost‐effective, and environmentally friendly alternative for engineering applications.