可纺沥青化学结构差异对其流变、纺丝及衍生碳纤维性能的影响
The effect of the chemical structure of spinnable pitches on their rhe-ological properties and spinnability and the properties of carbon fibers produced from them
摘要
Abstract
The structure and composition of a spin-nable pitch determine the properties of the carbon fibers produced from it.Spinnable pitches with low and high softening points(L-SP and H-SP)were pre-pared by air-blowing thermal polymerization of coal tar pitch.The polymerization mechanism,structural composition,properties of the pitch,and the carbon fiber properties were investigated by fluorescence excitation-emission spectroscopy with parallel factor analysis,EPR,13C-NMR,dynamic shear rheometry,XRD,Raman,etc.L-SP had the lower degree of polymerization,longer alkyl side chains,and a high-er proportion of C―O―C groups.At its spinning temperature,the molten L-SP had viscous-dominant rheological characteristics.H-SP had larger polycyclic aromatic hydrocarbon rings,a higher degree of branching,and a higher polarity.The molten H-SP had a high storage and loss moduli,and a rheological behavior with nearly balanced viscous and elastic properties.Although carbon fibers prepared from H-SP had the better physical properties,their inferior rheological prop-erties could lead to melt die swelling,the formation of surface particles and an increased number of irregularities.The superior viscoelasticity of L-SP promoted uniform stretching,maximizing the properties of carbon fibers.This ultimately resulted in similar tensile strengths and moduli of the carbon fibers prepared from the two pitches.The high-quality spinnable pitch had a high aromatic carbon content,a small size of its PAHs,and a low C=O/O―C=O content,which ensured viscosity-dominated rheological behavior,thereby reducing die swelling and melt fracture,and the spinning stability and properties of the carbon fibers produced were improved.关键词
化学组成/分子结构/流变性能/纺丝性能/沥青基碳纤维Key words
Chemical composition/Molecular structure/Rheological property/Spinning performance/Pitch-based car-bon fibers分类
化学化工引用本文复制引用
李倩,张兵锋,杨妍,左萍萍,秦芳芳,曲世杰,申文忠..可纺沥青化学结构差异对其流变、纺丝及衍生碳纤维性能的影响[J].新型炭材料（中英文）,2026,41(3):721-736,16.基金项目
This research was funded by Chinese Academy of Sciences Pilot Strategic Project A(XDA29050400),National Natural Science Founda-tion of China(U24A20548),National Natural Sci-ence Foundation of China(22479155),Innovation Fund of Institute of Coal Chemistry,Chinese Academy of Sciences(SCJC-XCL-2023-08),Open-end Fund Projects of China Institute for Radiation Protection Scientific Research Platform(CIRP2023OF001),Key Research and Development Projects of Shanxi Province(202101040201004),Shanxi Province PhD Project(2023SHB006). 中国科学院先导 A类专项(XDA29050400) （XDA29050400）
国家自然科学基金联合基金项目(U24A20548) （U24A20548）
国家自然科学基金面上项目(22479155) （22479155）
中国科学院山西煤炭化学研究所自主创新项目基础研究项目(SCJC-XCL-2023-08) （SCJC-XCL-2023-08）
中国辐射防护研究院自主科研项目平台开放基金类(CIRP2023OF001) （CIRP2023OF001）
山西省科技重大专项计划"揭榜挂帅"项目(202101040201004) （202101040201004）
山西省优秀博士生来晋项目(2023SHB006). （2023SHB006）
