Liaoning Key Laboratory of Pulp and Papermaking Engineering, Dalian Polytechnic University, Dalian, Liaoning 116034, China.
Light Industry and Food Engineering College, Guangxi University, Nanning, Guangxi 530004, China.
Int J Biol Macromol. 2020 Aug 1;156:669-680. doi: 10.1016/j.ijbiomac.2020.04.105. Epub 2020 Apr 19.
We reported a new approach for development of lignin-based carbon nanofibers (LCNFs) from two lignin-derived bio-oil (LB) obtained from catalytic depolymerization reaction combined with the organic solvent gradient separation process (including ethanol-soluble LB (EL) and tetrahydrofuran-soluble LB (TL)). This approach was particularly unique and translatable as it uses small molecule TL with high reactivity and low heterogeneity obtained via stalk lignin depolymerization to produce good morphologies and mechanical performances of LCNFs mixed with polyacrylonitrile under 85% high replacement rates. We first detailed characterization studies such as 2D-HSQC NMR, P NMR, FT-IR, GPC, TGA and DSC were conducted to understand the properties of EL and TL. Then, the goal of the influence of EL and TL on the LCNFs morphologies and mechanical properties were accomplished by using SEM, XRD, Raman and material testing machine. As compared with EL, the TL had excellent linear structure with relatively less total phenolic-OH groups and heterogeneity, which could improve lignin structure with better alignment along PAN, and thus increased the lignin replacement rates and mechanical performances of LCNFs.
我们报道了一种从两种木质素衍生生物油（LB）中开发木质素基碳纤维（LCNFs）的新方法，这两种生物油是通过催化解聚反应与有机溶剂梯度分离过程（包括乙醇可溶 LB（EL）和四氢呋喃可溶 LB（TL））获得的。这种方法非常独特且具有可转移性，因为它使用了小分子 TL，这种小分子 TL 具有高反应性和低异质性，是通过秸秆木质素解聚获得的，可在 85%的高取代率下与聚丙烯腈混合，产生良好形态和力学性能的 LCNFs。我们首先进行了详细的特性研究，如 2D-HSQC NMR、P NMR、FT-IR、GPC、TGA 和 DSC，以了解 EL 和 TL 的性质。然后，通过 SEM、XRD、拉曼和材料试验机研究了 EL 和 TL 对 LCNFs 形态和力学性能的影响。与 EL 相比，TL 具有优异的线性结构，总酚-OH 基团和异质性相对较少，这可以改善木质素结构，使其更好地沿 PAN 排列，从而提高 LCNFs 的木质素取代率和力学性能。
