Lignin-Based Direct Ink Printed Structural Scaffolds.,Small

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Lignin-Based Direct Ink Printed Structural Scaffolds.
Small ( IF 13.0 ) Pub Date : 2020-06-28 , DOI: 10.1002/smll.201907212
Bo Jiang ₁ , Yonggang Yao ₁ , Zhiqiang Liang ₁ , Jinlong Gao ₁ , Gegu Chen ₁ , Qinqin Xia ₁ , Ruiyu Mi ₁ , Miaolun Jiao ₁ , Xizheng Wang ₁ , Liangbing Hu ₁

Affiliation

3D printing of lignocellulosic biomass (cellulose, hemicellulose, and lignin) has attracted increasing attention by using this abundant, sustainable, and ecofriendly material. While cellulose can be easily tailored into a highly viscous ink for 3D printing, after solvent evaporation, the final printed structures become highly porous, fragile, and easily fall apart in water due to its hydrophilic nature. Lignin, another crucial component of natural lignocellulose, has not yet been reported for ink printing due to its unfavorable rheological behavior. Herein, a low‐cost direct ink printing strategy is developed to fabricate lignin‐based 3D structures with lignin no further refined and a more compact microstructure as well as different functionalities compared with printed cellulose. By using a soft triblock copolymer as the crosslinking agent, the rheology of lignin‐based inks can be adjusted from soft to rigid, and even enables vertical printing which requires stiff and self‐supporting features. The lignin‐based inks contain less water (≈40 wt%) and exhibit a much denser, stiffer structure, resulting in a wet tensile strength of ≈30 MPa, compared to only ≈0.6 MPa for printed cellulose. In addition, the unique macromolecular structure of lignin also demonstrates significantly improved stability in water and under heat, as well as UV‐blocking performance.

中文翻译：

基于木质素的直接油墨印刷结构支架。

通过使用这种丰富，可持续且环保的材料，木质纤维素生物质（纤维素，半纤维素和木质素）的3D打印引起了越来越多的关注。尽管可以轻松地将纤维素定制为用于3D打印的高粘度墨水，但在溶剂蒸发后，最终的打印结构由于具有亲水性，因此变得高度多孔，易碎，并且在水中容易崩解。木质素是天然木质纤维素的另一个重要组成部分，由于其不良的流变行为，尚未报道用于油墨印刷。本文中，开发了一种低成本的直接墨水打印策略，以制造基于木质素的3D结构，其中木质素无需进一步精制，并且与印刷纤维素相比具有更紧凑的微观结构以及不同的功能。通过使用柔软的三嵌段共聚物作为交联剂，木质素油墨的流变性可以从软性调整到刚性，甚至可以进行需要刚性和自支撑特性的垂直印刷。木质素基油墨所含的水量较少（约40 wt％），并具有更致密，更硬的结构，与印刷纤维素相比，其湿抗张强度仅为约0.6 MPa，约为30 MPa。此外，木质素的独特大分子结构还证明了其在水中和高温下的稳定性以及防紫外线性能的显着改善。印刷纤维素为6 MPa。此外，木质素的独特大分子结构还证明了其在水中和高温下的稳定性以及防紫外线性能的显着改善。印刷纤维素为6 MPa。此外，木质素的独特大分子结构还证明了其在水中和高温下的稳定性以及防紫外线性能的显着改善。

更新日期：2020-08-06

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