Journal of Industrial and Engineering Chemistry

The Korean Society of Industrial and Engineering Chemistry (한국공업화학회)
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Preparation and characterization of polyacrylonitrile-based carbon fibers produced by electron beam irradiation pretreatment

  • Shin, Hye Kyoung (Department of Chemistry, Inha University) ;
  • Park, Mira (Department of Textile Engineering, Chonbuk National University) ;
  • Kang, Phil Hyun (Research Division for Industry and Environment, Advanced Radiation Technology Institute, Korea Atomic Energy Research Institute) ;
  • Choi, Heung-Soap (Department of Mechanical and Design Engineering, Hongik University) ;
  • Park, Soo-Jin (Department of Chemistry, Inha University)
  • Received : 2013.12.02
  • Accepted : 2013.12.29
  • Published : 2014.09.25
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Abstract

This study evaluated the feasibility of polyacrylonitrile (PAN) fibers stabilized by thermal treatment after electron beam irradiation (EBI) in the production of carbon fibers. The effects of EBI and thermal treatments on the PAN precursor were verified by FT-IR, differential scanning calorimetry (DSC), X-ray diffraction (XRD), and scanning electron microscopy (SEM). FT-IR spectra confirmed that the intensities of the $C{\equiv}N$ stretching vibration at $2244cm^{-1}$ significantly decreased as the thermal treatment temperature increase from $200^{\circ}C$ to $250^{\circ}C$ and the holding time from 20 min to 40 min after EBI process. This decrease was caused by the cyclization of nitrile groups upon stabilization by the EBI and thermal treatments. The thermal properties were characterized by DSC, which confirmed that the EBI affected the quantity of the released heat as well as the position of exothermic equilibrium over a wide range of low temperatures. The majority of the exothermic peaks disappeared after thermal treatment. The stabilization index (SI) values for the PAN fibers that were exposed to EBI and thermal treatment after EBI were evaluated by XRD. The SI value of the PAN fibers that were treated at $250^{\circ}C$ for 40 min after EBI was 99.21%. Additionally, the tensile strength of carbon fibers that were produced from PAN attained about 2.3 GPa, the cross-section exhibited a clear and brittle morphology.

Keywords

Acknowledgement

Grant : Carbon valley construction program

Supported by : Ministry of Trade, Industry & Energy (MOTIE), Korea Institute for Advancement of Technology (KIAT)

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