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Torsional modulus and internal friction of polyacrylonitrile- and pitch-based carbon fibers

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Abstract

In the present work, the torsional modulus and internal friction of different types of polyacrylonitrile (PAN)- and pitch-based carbon fibers were measured with the torsional pendulum method to evaluate the relationship between these properties and the microstructure of carbon fibers. For easier and more accurate measurement, an aluminum disk-type pendulum was used. The measured torsional moduli were comparable to the previously reported values, which indicates the validity of the proposed method. The experimental results and discussion based on Eshelby’s solution and Mori–Tanaka’s mean stress method revealed that the torsional modulus should have a significant relation to the volume fraction of the crystalline region in the fibers and amorphous modulus. The results imply that fibers with a smaller crystalline region and higher amorphous modulus should show a higher torsional modulus. The internal friction of the fibers increased with the torsional modulus. This suggests that the internal friction may also be related to the size of the crystalline region and that the amorphous region has greater internal friction than the crystalline region.

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Author notes

  1. Masashi Ishikawa

    Present address: Tokushima University, 2-1 Minamijyousanjima-cho, Tokushima, 770-8506, Japan

Authors and Affiliations

  1. Tokyo University of Science, 6-3-1 Niijuku, Katsushika-Ku, Tokyo, 125-8585, Japan

    Masashi Ishikawa, Yasuo Kogo & Jun Koyanagi

  2. Toray Industries, Inc., 1515 Tsutsui, Masaki-cho, Iyo-Gun, Ehime, 791-3193, Japan

    Fumihiko Tanaka

  3. Tohoku University, 6-6-01 Aoba-yama, Aoba-ku, Sendai, Miyagi, 980-0856, Japan

    Tomonaga Okabe

Authors
  1. Masashi Ishikawa
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  2. Yasuo Kogo
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  3. Jun Koyanagi
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  4. Fumihiko Tanaka
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  5. Tomonaga Okabe
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Correspondence to Masashi Ishikawa.

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Ishikawa, M., Kogo, Y., Koyanagi, J. et al. Torsional modulus and internal friction of polyacrylonitrile- and pitch-based carbon fibers. J Mater Sci 50, 7018–7025 (2015). https://doi.org/10.1007/s10853-015-9254-z

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  • DOI: https://doi.org/10.1007/s10853-015-9254-z

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