Direct ink writing of lignin-based composites and their applications
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摘要: 作为自然界最丰富的可再生芳香族生物质资源,木质素近年来在能源、环境、医学等领域受到广泛关注。其中,采用3D打印技术构建具有特定结构和功能的木质素基复合材料是提升木质素附加值的重要途径之一,同时可有效避免木质素化学结构复杂多变、多分散性高、刚性大等在传统材料制备过程中带来的负面影响。本文围绕木质素基复合材料的直写式3D打印,重点综述了近年来木质素基复合材料在直写式3D打印方面的研究成果与进展。首先介绍了木质素的结构特性及直写式3D打印技术;然后系统总结了木质素流变学特性与其打印性能之间的构-效关系;最后讨论了3D打印的木质素基复合材料在能源、环境等领域的应用现状及其面临的挑战,并展望了木质素基复合材料在直写式3D打印方面的发展方向。Abstract: As the most abundant renewable aromatic biopolymer in nature, lignin recently has received extensive attention in the fields of energy, environment, and medicine. In particular, the use of 3D printing technology to construct lignin-based composites with tunable and desired structures and functions is one of the important ways to pro-mote the high-value utilization of lignin, which can also avoid the negative effects during traditional material preparation that caused by the diverse chemical structure, high polydispersity in molecular weight, and rigid structure of lignin. This paper focuses on the direct ink writing of lignin-based composites, mainly with the achievements and recent progress critically reviewed. Firstly, the structural features of lignin and the technology of direct ink writing are briefly summarized. Subsequently, the structure-rheology behavior relationship during 3D printing of lignin-based composites is discussed. Finally, the functional applications of 3D printed lignin-based composites in engineering, energy, and environment, as well as the potential problems and challenges, are summarized. Further, the main points towards future directions on lignin composites based on direct in writing are also highlighted.
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Key words:
- lignin composites /
- direct ink writing /
- rheological behavior /
- printability /
- applications
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图 1 木质素的分子结构模型:(a) 针叶材木质素;(b) 阔叶材木质素;(c) 草类木质素;(d) 阔叶材和草类木质素中阿魏酸酯连接形式;(e) 草类木质素中阿魏酸酯与阿拉伯木聚糖的连接形式;(f) 草类木质素中麦黄酮结构[9]
Figure 1. Molecular structure model of lignin: (a) Softwood lignin; (b) Hardwood lignin; (c) Grass lignin; (d) Ferulate in hardwoods and grasses lignin; (e) Ferulate on araxyl in grasses; (f) Tricin in grasses[9]
A—β-ether (β-O-4); B—Phenylcoumaran (β-5); C—Resinol (β-β); C′— Tetrahydrofuran (β-β); D—Dibenzodioxocin (5-5/4-O-β); E—Biphenyl ether (5-O-4); F—Spirodienone (β-1); X—Cinnamyl alcohol endgroup; pC—p-coumarate; pB—p-hydroxybenzoate; FA—Ferulate; Ac—Acetate; T—Tricin; H—p-hydroxyphenyl unit; G—Guaiacyl unit; S—Syringyl unit
图 4 木质素/g-C3N4/碳纳米管(CNT)“墨水”的流变学特性和可打印性
Figure 4. Rheological behavior and printability of lignin/g-C3N4/carbon nanotube (CNT) ink[38]
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