Preparation of pitch precursor with excellent spinnability for general-purpose carbon fibre using coal tar pitch as raw material

作     者：Jinchang Liu Chenyang Shen Lujie Huang Tinghao Fang Yaping Li Dingcheng Liang Qiang Xie Jinchang Liu;Chenyang Shen;Lujie Huang;Tinghao Fang;Yaping Li;Dingcheng Liang;Qiang Xie

作者机构：School of Chemical and Environmental EngineeringChina University of Mining and Technology(Beijing)Beijing 100083China 

出 版 物：《Chinese Journal of Chemical Engineering》 (中国化学工程学报（英文版）)

年 卷 期：2023年第54卷第2期

页      面：22-28页

核心收录：

学科分类：08[工学] 0805[工学-材料科学与工程（可授工学、理学学位）] 0703[理学-化学] 0702[理学-物理学] 

基　　金：the financial support provided by the National Natural Science Foundation of China (22008254) the Fundamental Research Funds for the Central Universities (2020XJHH01) the National Training Program of Innovation and Entrepreneurship for Undergraduates (C202003309) China University of Mining and Technology (Beijing) Yueqi Outstanding Scholar Project (2020JCB02)。 

主　　题：Carbon fibre Isotropic pitch Coal tar pitch(CTP) High spinnability Bromination–dehydrobromination 

摘      要：Tetrahydrofuran(THF) extract of coal tar pitch(CTP) was used instead of blending CTP with pretreated pyrolysis fuel oil to prepare an isotropic pitch precursor with excellent spinnability for general-purpose carbon fibre through bromination-dehydrobromination. The feasibility and effectiveness of synthesising an isotropic pitch precursor derived from THF-soluble(CTP-THFs) is demonstrated in this study.The results show that CTP-THFs contains more light components than CTP;CTP-THFs and CTP monomer proportions were 62.52% and 45.32%, respectively. However, based on comparisons of CTP-THFsBr0 and CTPBr0 characterisations, CTP-THFs exhibits better polycondensation than CTP. Bromination-dehydrobro mination promotes polycondensation of pitch precursors, leading to greater carbon aromaticity in CTP-THFsBr5, CTP-THFsBr10, and CTP-THFsBr15 than that in CTP-THFsBr0 and CTPBr0. CTP-THFsBr5 and CTP-THFsBr10 have excellent spinnability even with softening points as high as 230 ℃. The pericondensed carbon and carbon aromaticity of CTP-THFsBr5 and CTP-THFsBr10 are high owing to the higher degree of polycondensation;however, they still possess a more linear molecular structure. The as-prepared carbon fibre exhibits homogeneity and uniformity, and the mechanical performance is comparable with that of commercial general-purpose carbon fibre products.