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Evolution of electrical properties and microstructure of polyacrylonitrile-based carbon fibers during carbonization

  • Carbon Letters
  • Abbr : Carbon Lett.
  • 2022, 32(7), pp.1771-1779
  • DOI : 10.1007/s42823-022-00393-z
  • Publisher : Korean Carbon Society
  • Research Area : Natural Science > Natural Science General > Other Natural Sciences General
  • Received : May 11, 2022
  • Accepted : August 15, 2022
  • Published : December 1, 2022

Yu Jiyin 1 Liu Yong 1 Hua Xueni 1 Du Weifeng 2 Ning Chen 2 Ao Yuhui 1 Shang Lei 1

1Jilin Province Key Laboratory of Carbon Fiber Development and Application, College of Chemistry and Life Science, Changchun University of Technology
2Jilin Baojing Carbon Material Co.

Accredited

ABSTRACT

The evolvement in the microstructure and electrical properties of PAN-based carbon fibers during high-temperature carbonization were investigated. The study showed that as the heat treatment temperature increases, the change of carbon fiber resistivity around 1100 °C can be divided into two stages. In the first stage, the carbon content of the fiber increased rapidly, and small molecules such as nitrogen were gradually released to form a turbostratic of carbon crystal structure. The resistivity dropped rapidly from 3.19 × 10−5 Ω·m to 2.12 × 10−5 Ω·m. In the second stage, the carbon microcrystalline structure gradually became regular, and the electron movement area gradually became larger. At this time, the resistivity further decreases, from 2.12 × 10−5 Ω·m to 1.59 × 10−5 Ω·m. During carbonization, the tensile strength of carbon fiber first increased and then decreased. This is because the irregular and disordered graphite structure is formed first. As the temperature rose, the graphite layer spacing decreased and the grain thickness gradually increases. The modulus also gradually increased.

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