Analyses of oxidation process for isotropic pitch-based carbon fibers using model compounds

Senda, Takahiro; Yamada, Yoshio; Morimoto, Masakazu; Nono, Noriko; Sogabe, T.; Kubo, Shingo; Sato, Satoshi

doi:10.1016/j.carbon.2018.10.026

Cited by 68 publications

(24 citation statements)

References 69 publications

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“…A relatively low H 2 concentration was observed for MSF-330-4, which may explain more alkyl groups were oxidized to oxygen-containing groups and the hydrogen content was decreased. 17,20,28 The result was agreed with the produced quantity of H 2 O increasing with oxidative stabilization temperature during multistep oxidative stabilization in Figure 3(a) and decreasing during carbonization in Figure 4(a). Above 400 C, the producing rate of H 2 was significantly increased and was usually deemed to be a consequence of aromatic ring molecular thermal condensation reactions resulting in larger aromatic ring structure formation.…”

Section: Ms Analysis Of the Oxidative Stabilization And Stabilized supporting

confidence: 84%

“…For example, Takahiro Senda et al employed four model compounds to simulate the oxidative stabilization process and tried to estimate the detailed structures of isotropic pitch-based carbon fiber. 28 Guanming Yuan et al used several characterization techniques to illustrate the effect of oxidative stabilization step on the tensile strength and Young's modulus of tape-shaped naphthalene-based carbon fiber. 29,30 Yanbo Yao et al investigated the oxidation performance of heterogeneous pitch fiber to improve the oxidation efficiency and suppress deep stabilization for large diameter pitch fibers.…”

Section: Introductionmentioning

confidence: 99%

“…However, the oxidative stabilization process is complex and cannot be generalized due to hundreds of different polycyclic aromatic hydrocarbons and unclarity of structures in pitch fiber. 28 The oxidative stabilization of as-spun pitch fiber contains a series of successive reactions, in which the active groups (methyl, ethyl, etc.) of pitch molecule react with oxygen to form oxygen-containing functional groups, simultaneous releasing small molecular products (H 2 O, CO 2 , CO, etc.).…”

Section: Introductionmentioning

confidence: 99%

“…So far, many studies have been done to illuminate the chemical and physical changes of pitch‐based carbon fiber during oxidative stabilization. For example, Takahiro Senda et al employed four model compounds to simulate the oxidative stabilization process and tried to estimate the detailed structures of isotropic pitch‐based carbon fiber 28 . Guanming Yuan et al used several characterization techniques to illustrate the effect of oxidative stabilization step on the tensile strength and Young's modulus of tape‐shaped naphthalene‐based carbon fiber 29,30 .…”

Section: Introductionmentioning

confidence: 99%

“…These results provided some approaches to improve the oxidative stabilization performance of pitch fiber to a certain degree. However, the oxidative stabilization process is complex and cannot be generalized due to hundreds of different polycyclic aromatic hydrocarbons and unclarity of structures in pitch fiber 28 …”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

Evaluating multi‐step oxidative stabilization behavior of coal tar pitch‐based fiber

Niu

Zuo

Shen

et al. 2020

J of Applied Polymer Sci

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Oxidative stabilization is an important step for isotropic pitch-based carbon fiber preparation; coal tar pitch-based fiber is treated by multi-step oxidative stabilization under various conditions to investigate the oxidative stabilization mechanism. The chemical structure changes of isotropic pitch-based fiber during the oxidative stabilization and carbonization stage are systematically characterized by In-situ diffuse reflectance infrared Fourier transform, elemental analysis, mass spectroscopy, X-ray photoelectron spectroscopy, nuclear magnetic resonance, scanning electron microscope with an energy dispersive X-ray spectrometer. These results show that the oxygen distribution gradient in oxidative stabilized fiber radial direction become homogeneously with the increasing of oxidation temperature and time under multi-step oxidative stabilization. The resultant carbon fiber shows tensile strength of 942 ± 42 MPa and Young's modulus of 42.8 ± 3.1 GPa due to appropriate oxygen content, homogeneous oxygen distribution, more cross-link bond (C-O-C) content, higher aromaticity and lower weight loss introduced in multi-step oxidative stabilized pitch fiber. The multi-step oxidative stabilization provides synergy effect between reaction rate and the oxygen diffusion rate as well as eliminates the oxygen concentration gradient, it provides an time-saving and energyeffective method for the oxidative stabilization of isotropic pitch-based carbon material (pitch fiber, pitch microsphere, etc.) and improve the resultant carbon material performance.

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Section: Ms Analysis Of the Oxidative Stabilization And Stabilized supporting

confidence: 84%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Evaluating multi‐step oxidative stabilization behavior of coal tar pitch‐based fiber

Niu

Zuo

Shen

et al. 2020

J of Applied Polymer Sci

View full text Add to dashboard Cite

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Investigation on promotion effect of oxidative stabilization for pitch‐based fiber by co‐carbonization of coal tar pitch and atmospheric residual

Niu,

Miao,

Shen

et al. 2024

J of Applied Polymer Sci

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As a pivotal step in the preparation of carbon fiber, oxidative stabilization not only plays a crucial role in maintaining fibrous morphology but also contributes significantly to enhance mechanical properties of resultant carbon fiber. Due to high activation energy of pitch molecules reaction with oxygen and the sluggish diffusion of oxygen within the fiber, the improvement of oxidative stabilization efficiency faces significant challenges. Atmospheric residual (AR) has a high and easily oxidized aliphatic structure. Spinnable pitch is synthesized by co‐carbonization of coal tar pitch (CTP) and AR at a ratio of 3:1 in this work. Its methylene bridge bond ratio is 4.45% and have an appropriate amount aliphatic structure, which makes pitch molecular more linear and naphthenic. Excessive addition of AR is detrimental to spinning performance. The most optimal oxidative stabilization temperature of as‐spun fiber was 280°C, which is lower than that of fiber produced by CTP alone (300°C), displaying a higher oxidative stabilization efficiency. The obtained pitch‐based carbon fiber shows excellent mechanical properties with tensile strength of 999.0 ± 80.1 MPa and Young's modulus of 57.7 ± 3.5 GPa. The co‐carbonization by two different substances has been applied in manufacturing carbon fiber, providing a facile approach to accelerate the oxidative stabilization of pitch fiber.

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Effect of Methyl Groups on Formation of Ordered or Layered Graphitic Materials from Aromatic Molecules

Jana

Kearney

Naskar

et al. 2023

Small

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Developing functionally complex carbon materials from small aromatic molecules requires an understanding of how the chemistry and structure of its constituent molecules evolve and crosslink, to achieve a tailorable set of functional properties. Here, molecular dynamics (MD) simulations are used to isolate the effect of methyl groups on condensation reactions during the oxidative process and evaluate the impact on elastic modulus by considering three monodisperse pyrene‐based systems with increasing methyl group fraction. A parameter to quantify the reaction progression is designed by computing the number of new covalent bonds formed. Utilizing the previously developed MD framework, it is found that increasing methylation leads to an almost doubling of bond formation, a larger fraction of the new bonds oriented in the direction of tensile stress, and a higher basal plane alignment of the precursor molecules along the direction of tensile stress, resulting in enhanced tensile modulus. Additionally, via experiments, it is demonstrated that precursors with a higher fraction of methyl groups result in a higher alignment of molecules. Moreover, increased methylation results in the lower spread of single molecule alignment which may lead to smaller variations in tensile modulus and more consistent properties in carbon materials derived from methyl‐rich precursors.

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Analyses of oxidation process for isotropic pitch-based carbon fibers using model compounds

Cited by 68 publications

References 69 publications

Evaluating multi‐step oxidative stabilization behavior of coal tar pitch‐based fiber

Evaluating multi‐step oxidative stabilization behavior of coal tar pitch‐based fiber

Investigation on promotion effect of oxidative stabilization for pitch‐based fiber by co‐carbonization of coal tar pitch and atmospheric residual

Effect of Methyl Groups on Formation of Ordered or Layered Graphitic Materials from Aromatic Molecules

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