Sensors and Composites Group, School of Metallurgy and Materials, University of Birmingham, Edgbaston, Birmingham B15 2TT, United Kingdom.
ACS Appl Bio Mater. 2023 Aug 21;6(8):3153-3165. doi: 10.1021/acsabm.3c00278. Epub 2023 Jul 31.
This paper reports on the production of electro-spun nanofibers from softwood Kraft lignin without the need for polymer blending and/or chemical modification. Commercially available softwood Kraft lignin was fractionated using acetone. The acetone-soluble lignin (AcSL) had an ash content of 0.06 wt %, a weight average molecular weight of 4250 g·mol along with the polydispersity index of 1.73. The corresponding values for as-received lignin (ARL) were 1.20 wt %, 6000 g·mol, and 2.22, respectively. The AcS was dissolved in a binary solvent consisting of acetone, and dimethyl sulfoxide (2:1, v/v) was selected for dissolving the AcSL. Conventional and custom-designed grounded electrode configurations were used to produce electro-spun neat lignin fibers that were randomly oriented or highly aligned, respectively. The diameter of the electro-spun fibers ranged from 1.12 to 1.46 μm. After vacuum drying at 140 °C for 6 h to remove the solvents and oxidation at 250 °C, the fibers were carbonized at 1000, 1200, and 1500 °C for 1 h. The carbonized fibers were unfused and void-free with an average diameter of 500 nm. Raman spectroscopy, scanning electron microscopy, and image analysis were used to characterize the carbonized fibers.
本文报道了一种无需聚合物共混和/或化学改性即可从软木硫酸盐木质素制备电纺纳米纤维的方法。商业上可获得的软木硫酸盐木质素用丙酮进行分级。丙酮可溶木质素（AcSL）的灰分含量为 0.06wt%，重均分子量为 4250g·mol，多分散指数为 1.73。相应的原始木质素（ARL）的值分别为 1.20wt%、6000g·mol 和 2.22。AcS 溶解在由丙酮和二甲基亚砜（2:1，v/v）组成的二元溶剂中，用于溶解 AcSL。使用常规和定制设计的接地电极配置来生产电纺纯木质素纤维，分别为无规取向或高度取向。电纺纤维的直径范围为 1.12 至 1.46μm。在 140°C 下真空干燥 6 小时以去除溶剂并在 250°C 下氧化后，纤维在 1000、1200 和 1500°C 下碳化 1 小时。碳化纤维未熔合且无空隙，平均直径为 500nm。使用拉曼光谱、扫描电子显微镜和图像分析对碳化纤维进行了表征。
