Manufacturing spinnable mesophase pitch using direct coal extracted fraction and its derived mesophase pitch based carbon fiber

Hiroki Shimanoe, Takashi Mashio, Koji Nakabayashi, Toshinori Inoue, Maki Hamaguchi, Jin Miyawaki, Isao Mochida, Seong Ho Yoon

Research output: Contribution to journalArticle

Abstract

Spinnable mesophase pitch with high pitch yield of more than 50 wt% was successfully prepared using direct bitumen coal extracted fraction through the three-step process of hydrogenation, N2 blowing heat treatment, and thin-layer evaporation. The prepared mesophase pitch was smoothly spun to the fibrous form and could be converted into mesophase pitch-based carbonized and graphitized fibers through the usual oxidative stabilization, carbonization, and graphitization. The prepared mesophase pitch based carbon fibers showed typical random transversal structures with mechanical performances, tensile strengths of 1.83 GPa and 3.00 GPa, Young's moduli of 133 GPa and 450 GPa, and elongation properties of 1.37% and 0.68% after heat treatments at 1000 °C for 30 min and 2800 °C for 10 min, respectively. The relatively high-molecular-weight and well-developed polynuclear aromatic molecular structure of hypercoal is the likely reason for the high mesophase pitch yield. The meaning of each preparation processes, hydrogenation, N2 blowing heat treatment and thin layered evaporation, was discussed in detail. We anticipate that the success of high-yield mesophase pitch manufacturing using hypercoal as raw material will be an important key to innovatively reduce the production cost of mesophase pitch-based carbon fiber.

Original languageEnglish
JournalCarbon
DOIs
Publication statusAccepted/In press - Jan 1 2019

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Coal
Carbon fibers
asphalt
Heat treatment
Blow molding
Hydrogenation
Evaporation
Graphitization
Carbonization
Molecular structure
Elongation
Raw materials
Tensile strength
Stabilization
Elastic moduli
Molecular weight
Fibers
carbon fiber
Costs

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Materials Science(all)

Cite this

Manufacturing spinnable mesophase pitch using direct coal extracted fraction and its derived mesophase pitch based carbon fiber. / Shimanoe, Hiroki; Mashio, Takashi; Nakabayashi, Koji; Inoue, Toshinori; Hamaguchi, Maki; Miyawaki, Jin; Mochida, Isao; Yoon, Seong Ho.

In: Carbon, 01.01.2019.

Research output: Contribution to journalArticle

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AU - Shimanoe, Hiroki

AU - Mashio, Takashi

AU - Nakabayashi, Koji

AU - Inoue, Toshinori

AU - Hamaguchi, Maki

AU - Miyawaki, Jin

AU - Mochida, Isao

AU - Yoon, Seong Ho

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N2 - Spinnable mesophase pitch with high pitch yield of more than 50 wt% was successfully prepared using direct bitumen coal extracted fraction through the three-step process of hydrogenation, N2 blowing heat treatment, and thin-layer evaporation. The prepared mesophase pitch was smoothly spun to the fibrous form and could be converted into mesophase pitch-based carbonized and graphitized fibers through the usual oxidative stabilization, carbonization, and graphitization. The prepared mesophase pitch based carbon fibers showed typical random transversal structures with mechanical performances, tensile strengths of 1.83 GPa and 3.00 GPa, Young's moduli of 133 GPa and 450 GPa, and elongation properties of 1.37% and 0.68% after heat treatments at 1000 °C for 30 min and 2800 °C for 10 min, respectively. The relatively high-molecular-weight and well-developed polynuclear aromatic molecular structure of hypercoal is the likely reason for the high mesophase pitch yield. The meaning of each preparation processes, hydrogenation, N2 blowing heat treatment and thin layered evaporation, was discussed in detail. We anticipate that the success of high-yield mesophase pitch manufacturing using hypercoal as raw material will be an important key to innovatively reduce the production cost of mesophase pitch-based carbon fiber.

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