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Effect of low processing rate on homogeneous microstructural evolution of polyacrylonitrile-based carbon fibers

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Abstract

This study demonstrates that low processing rate for producing polyacrylonitrile (PAN)-based carbon fiber is a critical to obtain a homogeneous radial microstructure with high resistance to oxidation, thereby resulting in their improved mechanical strength. The dry-jet wet spun PAN organic fibers were processed (e.g., stabilized and then carbonized) utilizing two different rates; one is 1.6 times longer than the other. The effect of processing rate on the microstructural evolutions of carbon fibers was analyzed by scanning electron microscopy after slow etching in air, as well as Raman mapping after graphitization. The rapidly processed fiber exhibited the multilayered radial structure, which is caused by the radial direction stretching of the extrusion in the spinning. In case of the slowly processed fiber, the layered radial structure formed in the spinning process was changed into a more homogeneous radial microstructure. The slowly processed fibers showed higher oxidation resistance, higher mechanical properties, and higher crystallinity than the rapidly processed one. Raman mapping confirmed that the microstructure developed during spinning was sustained even though fiber was thermally treated up to 2800 °C.

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Acknowledgements

This research was supported by the Hyosung Corporation, Basic Science Research Program, through the National Research Foundation of Korea (NRF) funded by the Ministry of Education (NRF-2018R1D1A1A02046116) and Nano Material Technology Development Program through the National Research Foundation of Korea (NRF) funded by Ministry of Science and ICT (NRF-2016M3A7B4905618). Y.A.K. acknowledged the financial support from the Technology Innovation Program (20000207) funded by the Ministry of Trade, Industry & Energy (MOTIE, Korea).

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Authors and Affiliations

  1. Institute of Advanced Composite Materials, Korea Institute of Science and Technology, 92 Chudong-ro, Bongdong-eup, Wanju-Gun, Jeonbuk, 55324, Republic of Korea

    Doo-Won Kim

  2. Hyosung Corporation, Jeonju Plant, 886 Girin-daero, Deokjin-gu, Jeonju-Si, Jeonbuk, 54849, Republic of Korea

    Dae Ho Kim & Sung Ryong Kim

  3. Division of Science Education, Chemistry Education Major, Daegu University, 201 Daegudae-ro, Gyeongsan-Si, Gyeongsangbuk-do, 38453, Republic of Korea

    Bo-Hye Kim

  4. Korea Institute of Carbon Convergence Technology, 110-11 Banlyong-ro, Deokjin-gu, Jeonju-si, Jeollabuk-do, 54853, Republic of Korea

    Yun Hyuk Bang

  5. Department of Chemistry, University of Texas at Dallas, 800 West Campbell Rd, Richardson, TX, 75080, USA

    Duck Joo Yang

  6. Department of Polymer Engineering, Graduate School, School of Polymer Science and Engineering and Alan G. MacDiarmid Energy Research Institute, Chonnam National University, 77 Yongbong-ro, Buk-gu, Gwangju, 61186, Republic of Korea

    Go Bong Choi, Yoong Ahm Kim & Kap Seung Yang

  7. Carbon Composite Materials R&D Center HPK Inc, 308 Venture Support Building, Banlyong-ro, Deckjin-gu, Jeonju-Si, Jeollabuk-do, 54853, Republic of Korea

    Kap Seung Yang

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  1. Doo-Won Kim
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  2. Dae Ho Kim
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  8. Yoong Ahm Kim
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Correspondence to Yoong Ahm Kim or Kap Seung Yang.

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Kim, DW., Kim, D.H., Kim, S.R. et al. Effect of low processing rate on homogeneous microstructural evolution of polyacrylonitrile-based carbon fibers. Carbon Lett. 29, 479–485 (2019). https://doi.org/10.1007/s42823-019-00047-7

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  • DOI: https://doi.org/10.1007/s42823-019-00047-7

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