煤炭转化2025，Vol.48Issue(4)：48-58,11.DOI:10.19726/j.cnki.ebcc.202504005
两种煤基沥青的分子结构及其各向同性沥青基碳纤维力学性能研究
Molecular structures difference of two kinds of coal-based pitch on mechanical properties of their derived isotropic pitch-based carbon fibers
摘要
Abstract
This study focused on the influence of the molecular structure of coal-based pitches on the mechanical properties of isotropic pitch-based carbon fibers(IPCFs).Coal tar pitch(CTP)and coal liquefaction pitch(CLP)were used as raw materials to prepare spinning pitches with 100％isotropic optical texture(IP)and their corresponding carbon fibers through a solvent extraction-air oxidation process.The molecular structures of the toluene-soluble(TS)components of the two feedstocks,and the evolution of oxygen content and structural features during the preparation of IPCFs were characterized using infrared spectroscopy(IR),time-of-flight mass spectrometry(TOF-MS),thermogravimetric-differential scanning calorimetry(TG-DSC),and X-ray photoelectron spectroscopy(XPS).Results indicate that CLP-TS contains more abundant aliphatic side chains than CTP-TS,providing more oxidative reactive sites during air oxidation for preparing IP and thus significantly improving the thermal stability of CLP-IP.CTP-IP mainly undergoes oxidation cross-linking reactions at aliphatic C-H,whereas CLP-IP also experiences significant oxidation cross-linking reactions at aromatic C-H during stabilization of the as-spun fibers,resulting in higher contents of cross-linked oxygen-containing functional groups in the stabilized fibers.This reduces carbon loss and microstructural defects during carbonization,and promotes the formation of more stable network-like carbon layer arrangements,thereby improving the mechanical properties of the IPCFs.Consequently,the average tensile strength of CTP-CF and CLP-CF are(835±87)MPa and(1 135±60)MPa,and average tensile modulus of(49±7)GPa and(65±6)GPa,respectively.关键词
碳纤维/各向同性沥青/煤焦油沥青/煤液化沥青/氧交联结构Key words
carbon fiber/isotropic pitch/coal tar pitch/coal liquefaction pitch/oxygen cross-linked structure分类
化学化工引用本文复制引用
李重,吴聪,张舸,王卓,李轩科,郭建光..两种煤基沥青的分子结构及其各向同性沥青基碳纤维力学性能研究[J].煤炭转化,2025,48(4):48-58,11.基金项目
国家自然科学基金资助项目(U23B2076). （U23B2076）
