Journal ArticleDOI
Preparation of pitch precursor with excellent spinnability for general-purpose carbon fibre using coal tar pitch as raw material
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In this paper , the feasibility and effectiveness of synthesizing an isotropic pitch precursor derived from THF-soluble (CTP-THFs) is demonstrated in this study. But the results show that CTP-THF contains more light components than CTP; CTP and CTP monomer proportions were 62.52% and 45.32%, respectively.Abstract:
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–dehydrobromination 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 °C. The peri-condensed 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. read more
Citations
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Controllable Synthesis of a Carbonaceous Pitch from Molecular Dimension by a Novel Method of Chlorination-Dechlorination
Journal ArticleDOI
Differences of the pyrolytic behaviors and pyrolysis products of coal pitch from different sources
Chunyang Zhang,Yilin Fang,Yaming Zhu,Hongyu Chu,Chaoshuai Hu,Yunliang Xu,Xuefei Zhao,Yong Hui Bai +7 more
TL;DR: In this paper , the microstructure of pyrolysis products from different coal pitches has been analyzed by optical microscope, X-ray diffraction (XRD), Raman spectrum, scanning electron microscope (SEM), and N2-adsorption and desorption (BET) method, respectively.
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Chlorination–dechlorination of coal liquefaction residue using benzyl chloride for general-purpose carbon fiber synthesis
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Mechanism and application of halogenation–dehalogenation in the development of pitch-based carbon fiber: A review
TL;DR: In this paper , the authors reviewed the mechanism and application, as well as the advantages and disadvantages of each halogenation-dehalogenation method for the controllable synthesis of a pitch precursor.
References
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Journal ArticleDOI
Recent Progress in Fabrication, Structure, and Properties of Carbon Fibers
Yaodong Liu,Satish Kumar +1 more
TL;DR: In this article, a review of recent developments in carbon fibers is presented, focusing on relationships among processing conditions, chemical/physical structures and tensile properties of polyacrylonitrile and meso-phase pitch-based carbon fibers.
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Preparation of carbon fibers with excellent mechanical properties from isotropic pitches
Byung Jun Kim,Youngho Eom,Osamu Kato,Jin Miyawaki,Byoung Chul Kim,Isao Mochida,Seong Ho Yoon +6 more
TL;DR: In this paper, a novel isotropic pitch composed of linear methylene chains of polycondensed aromatic molecules was synthesized from naphtha-cracked oil through bromination and subsequent dehydrobromination (NB).
Journal ArticleDOI
Preparation of pitch based carbon fibers using Hyper-coal as a raw material
TL;DR: In this paper, a cost-effective method for producing an isotropic pitch-based carbon fiber using the 1-methylnaphthalene (MN) soluble fraction of Hyper-coal (HPC) was newly developed.
Journal ArticleDOI
Mesophase development in petroleum and coal-tar pitches and their blends
TL;DR: In this paper, the behavior of mixtures of an impregnating coal-tar pitch and a petroleum pitch during the early stages of carbonisation was studied, focusing on the formation and development of mesophase and the role played by primary quinoline insolubles.
Journal ArticleDOI
Molecular structures for the oligomeric constituents of petroleum pitch
Ward A. Burgess,Mark C. Thies +1 more
TL;DR: In this paper, a mesophase-forming fraction of M-50 petroleum pitch was characterized in terms of polycyclic aromatic hydrocarbon (PAH) backbone structure, the extent of alkylation, and the nature of the bonds connecting the monomeric "building blocks" comprising the oligomeric species.