聚丙烯腈
碳化
材料科学
介孔材料
热解
纤维
化学工程
热稳定性
木质素
复合材料
聚合物
有机化学
催化作用
化学
扫描电子显微镜
工程类
作者
Bing Zhang,Chunxiang Lü,Yaodong Liu,Shuxia Yuan
标识
DOI:10.1016/j.polymdegradstab.2019.109021
摘要
Due to its unique structure, hollow-mesoporous carbon fibers would enlarge the applications of hollow fiber in the areas operating in the harsh environment. In this paper, polyacrylonitrile (PAN) -based hollow-mesoporous carbon fibers (HMCFs) with various carbonization temperatures were firstly fabricated by heat treatments including stabilization and carbonization with the hollow-mesoporous precursor fibers preparing with blending alkali lignin (AL). Unlike previously, a small amount of residue of AL (less than 1%) in the hollow-mesoporous fiber (HMF) would reduce the degree of cyclization although the activation energy of cyclization reaction reduces, and thus accelerate the thermal decomposition of HMF which shows a lower carbon yield eventually compared with PAN. The oxidative stability of fibers improves a lot when HMF is transformed into HMCF which is beneficial to use it in the poor conditions. This work explains the effects of residue of AL existing in the precursor fiber on the processes of stabilization and carbonization of HPCMs, and the relationships between basic properties of HMCFs including physical structure, chemical composition and relevant properties and carbonization temperature. It provides a new insight to fabricate HMF into HMCF by the heating treatments of stabilization and carbonization with the existence of AL.
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