木质素
聚丙烯腈
分散性
分馏
化学工程
化学成分
结晶
热稳定性
化学
降水
材料科学
碳纤维
有机化学
聚合物
复合材料
复合数
物理
工程类
气象学
作者
Huan Liu,Zhong Dai,Qiping Cao,Xin Shi,Xing Wang,Haiming Li,Ying Han,Yao Li,Jinghui Zhou
出处
期刊:ACS Sustainable Chemistry & Engineering
[American Chemical Society]
日期:2018-05-31
卷期号:6 (7): 8554-8562
被引量:60
标识
DOI:10.1021/acssuschemeng.8b00868
摘要
The effects of lignin chemical structures on the quality of lignin-based carbon fibers are still not clear. For this reason, we address the challenge by using a simple acid precipitation method to separate and purify lignin and study the effects of physicochemical characteristics of fractionated lignin on the properties of lignin-based CFs. The precipitation carried out by sequential acidification at different pH levels (10, 8, 6, 4, and 2) is indeed effective in obtaining fractionated lignin samples with different chemical structures, including molecular weights, units' composition ratios, and polydispersity indexes (PDIs). All the fractionated lignin samples are respectively blended with polyacrylonitrile at the ratio of 1:1 (w/w) and electro-spun into fibers. Results suggest that a fractionated lignin sample with a large molecular weight, low PDI, and strong thermal stability can produce carbon fibers with excellent performance, such as good spinnability, high crystallization, and mechanical strength.
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