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Investigation into the Gelation of Polyacrylonitrile Solution Induced by Dry-jet in Spinning Process and Its Effects on Diffusional Process in Coagulation and Structural Properties of Carbon Fibers

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Abstract

The jet effect in dry-jet wet spinning of a polyacrylonitrile (PAN) solution was investigated. The two parameters, jet-stretch ratio and air gap length, of the jet were controlled to elucidate each effect on PAN precursors and resulting carbon fibers. Excessively high jet-stretch ratio (>4) or air-gap (>1 cm) resulted in the development of the internal pore structure in PAN precursors. The pores remained even after the densification by thermal treatment acting as defects for poor tensile properties of carbon fibers (CFs). It was revealed that two parameters critically controlled the bidirectional diffusion of both solvent and non-solvent by determining the degree of the surface gelation at the jet. Excessively high jet-stretch ratio or high air-gap length created a thick solid skin on extruded dope limiting solvent/non-solvent diffusion. As a method to limit the development of the pores under the condition of high jet stretch ratio (>4), raising the dope temperature for limiting the degree of gelation at the jet was attempted and successfully manufactured mechanically improved fiber with a dense structure without pores under high jet-stretch condition. The study suggests that the high quality PAN precursors for high performance CFs can be manufactured under high jet-stretch ratio condition with proper management on gelation at the jet.

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Authors and Affiliations

  1. Carbon Composite Materials Research Center, Institute of Advanced Composite Materials, Korea Institute of Science and Technology, Jeonbuk, 55324, Korea

    Keon-Ah Shin, Sejoon Park, Huong Thi Bich Nguyen, Sungho Lee & Seong Mu Jo

  2. Polymer Nano Science and Technology, Chunbuk National University, Jeonbuk, 54896, Korea

    Keon-Ah Shin & Joong Hee Lee

  3. Department of Nanomaterials Engineering, Korea University of Science and Technology, 217 Gajeong-ro, Tuseong-gu, Daejeon, 34113, Korea

    Huong Thi Bich Nguyen, Sungho Lee & Seong Mu Jo

  4. Konkuk University, Department of Energy Engineering, Neungdong-ro 120, Gwangjin-gu, Seoul, 05023, Korea

    Han-Ik Joh

Authors
  1. Keon-Ah Shin
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  2. Sejoon Park
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  3. Huong Thi Bich Nguyen
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  4. Joong Hee Lee
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  5. Sungho Lee
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Correspondence to Seong Mu Jo.

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Acknowledgments: The authors acknowledge the financial support of this work from the Korea Institute of Science and Technology.

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Shin, KA., Park, S., Nguyen, H.T.B. et al. Investigation into the Gelation of Polyacrylonitrile Solution Induced by Dry-jet in Spinning Process and Its Effects on Diffusional Process in Coagulation and Structural Properties of Carbon Fibers. Macromol. Res. 26, 544–551 (2018). https://doi.org/10.1007/s13233-018-6070-8

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  • DOI: https://doi.org/10.1007/s13233-018-6070-8

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