Enhancing the oxidative stabilization of isotropic pitch precursors prepared through the co-carbonization of ethylene bottom oil and polyvinyl chloride

Liu, Jinchang; Shimanoe, Hiroki; Nakabayashi, Koji; Miyawaki, Jin; Choi, Jong Eun; Jeon, Young Pyo; Yoon, Seong Ho

doi:10.1016/j.jiec.2018.07.008

Cited by 20 publications

(8 citation statements)

References 22 publications

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“…44 Therefore, stabilization is necessary before carbonization, which allows oxygen to enter the molecular structure of pitch fiber and form abundant oxygen-containing functional groups. 45 The oxygen will escape from the fiber slowly in the subsequent carbonization reaction, thus keeping the pitch fiber in the melt-free state. The purpose of stabilization is to change the pitch fiber from the thermoplastic state to the thermosetting state through the oxidation reaction.…”

Section: Pitch-based Carbon Fiber Production Processmentioning

confidence: 99%

“…Liu et al 45 used polyvinyl chloride as the chlorine source, and ethylene bottom oil was applied as the raw material to synthesize the pitch precursor by chlorination–dechlorination method. The obtained pitch precursor has a higher pitch yield and better spinnability in comparison to the pitch pretreated by simple atmospheric distillation.…”

Section: Halogenation–dehalogenationmentioning

confidence: 99%

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Mechanism and application of halogenation–dehalogenation in the development of pitch-based carbon fiber: A review

Liu

et al. 2023

Journal of Engineered Fibers and Fabrics

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Pitch-based carbon fiber, as one of the important engineering materials, has been widely used in aerospace, defense, sports, and other fields. In the long production process of pitch-based carbon fiber, the property of pitch precursor is significant for the mechanical performance of obtained carbon fiber. Thus, it is crucial to improve the property of pitch precursor by efficient means. Halogenation–dehalogenation is a newly developed method for the controllable synthesis of a pitch precursor from the molecular dimension, including fluorination–defluorination, chlorination–dechlorination, and bromination–debromination. This work reviewed the mechanism and application, as well as the advantages and disadvantages of each halogenation–dehalogenation method.

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Section: Pitch-based Carbon Fiber Production Processmentioning

confidence: 99%

Section: Halogenation–dehalogenationmentioning

confidence: 99%

Mechanism and application of halogenation–dehalogenation in the development of pitch-based carbon fiber: A review

Liu

et al. 2023

Journal of Engineered Fibers and Fabrics

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“…The CPVC CFs that show similar mechanical performances with IPCFs are thus thought to be applicable to activated carbon fibre at this stage. Moreover, if its mechanical performance is further improved to 1.7 and 170 GPa in tensile strength and Young's modulus, respectively, it can also be applicable to car body and windmill structure [22], because the CPVC CF would have high advantages in terms of production costs, since its materials are low-cost and it has capability of skipping over the oxidative stabilisation process, which is the most costly step of carbon fibre production. This is going to be a very challenging task, but we consider it to be achievable and our group is currently conducting related studies like reducing fibre diameter to half the current size and modification of the molecular arrangement and molecular weight distribution of the CPVC.…”

Section: Samplementioning

confidence: 99%

Highly Chlorinated Polyvinyl Chloride as a Novel Precursor for Fibrous Carbon Material

Liu

Shimanoe

et al. 2020

Polymers

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Pure, highly chlorinated polyvinyl chloride (CPVC), with a 63 wt % of chlorine, showed a unique-thermal-pyrolytic-phenomenon that meant it could be converted to carbon material through solid-phase carbonisation rather than liquid-phase carbonisation. The CPVC began to decompose at 270 °C, with a rapid loss in mass due to dehydrochlorination and novel aromatisation and polycondensation up to 400 °C. In this study, we attempted to prepare carbon fibre (CF) without oxidative stabilisation, using the aforementioned CPVC as a novel precursor. Through the processes of solution spinning and solid-state carbonisation, the spun CPVC fibre was directly converted to CF, with a carbonisation yield of 26.2 wt %. The CPVC-derived CF exhibited a relatively smooth surface; however, it still demonstrated a low mechanical performance. This was because the spun fibre was not stretched during the heat treatment. Tensile strength, Young’s modulus and elongation values of 590 ± 84 MPa, 50 ± 8 GPa, and 1.2 ± 0.2%, respectively, were obtained from the CPVC spun fibre, with an average diameter of 19.4 μm, following carbonisation at 1600 °C for 5 min.

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“…With a high carbon content and low ash content, EO is a cheap material that can be used for the potential preparation of isotropic pitch and carbon fiber materials. Starting from EO, the preparation methods of isotropic pitch precursors and GPCFs include thermal condensation [ 12 , 13 ], co-carbonization with PVC [ 14 , 15 ], and bromination-debromination [ 16 ]. However, a higher temperature is required to synthesize pitch precursors by thermal condensation and co-carbonization with PVC.…”

Section: Introductionmentioning

confidence: 99%

“…The microstructure of pitch precursor plays a significant role in properties and mechanical performance of obtained carbon fibers. Molecular structure regulation in the process of synthesis of pitch precursor has attracted more attention, and the development and application of bromination-dehydrobromination and chlorination-dehydrochlorination methods prove it very well [ 14 , 15 , 16 ]. The molecular structure of isotropic pitch precursors is mainly composed of condensed aromatic hydrocarbons that are thought to be aggregate structures in the pitch microstructure, and the aggregate structure is surrounded by aliphatic groups [ 1 ].…”

Section: Introductionmentioning

confidence: 99%

Effects of Bromination-Dehydrobromination on the Microstructure of Isotropic Pitch Precursors for Carbon Fibers

et al. 2020

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In this work, isotropic pitch precursors are synthesized by the bromination-debromination method with ethylene bottom oil (EO) as the raw material and bromine as the initiator for pitch formation and condensation reactions. The aggregation structure, molecular weight distribution, and molecular structure of isotropic pitch precursors are characterized by thermal mechanical analyzer (TMA), MALDI TOF-MS, and 13C NMR, respectively, for revealing the mechanism of synthesis of isotropic pitch precursors. The results show that at low bromine concentrations, polycyclic aromatic hydrocarbons (PAHs) were mainly ordered in cross-linked structures by bromination-debromination through substitution reactions of side chains. The condensed reactivity can be improved by the effect of bromine, meaning that condensation reaction was aggravated by the method of bromination-dehydrobromination. In the presence of excess bromine, the cross-linked stereo structure of PAHs changed to the planar structure of condensed PAHs, which was not conducive to the subsequent spinning and preparation of carbon fibers.

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Enhancing the oxidative stabilization of isotropic pitch precursors prepared through the co-carbonization of ethylene bottom oil and polyvinyl chloride

Cited by 20 publications

References 22 publications

Mechanism and application of halogenation–dehalogenation in the development of pitch-based carbon fiber: A review

Mechanism and application of halogenation–dehalogenation in the development of pitch-based carbon fiber: A review

Highly Chlorinated Polyvinyl Chloride as a Novel Precursor for Fibrous Carbon Material

Effects of Bromination-Dehydrobromination on the Microstructure of Isotropic Pitch Precursors for Carbon Fibers

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