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<p>An environmentally friendly approach utilizing concentrated solar irradiation as an energy source was explored for modifying polyacrylonitrile fiber (co-PAN) prior to thermal oxidative stabilization (TOS). The modified co-PAN fibers underwent thermal treatment within the temperature range of 220–240&#xa0;°C, corresponding to the TOS stage. Structural changes were analyzed using X-ray diffraction, infrared spectroscopy, and thermal analysis techniques. The study revealed that the initial modification of co-PAN fibers significantly accelerated the cyclization of nitrile groups, thereby enhancing their chemical transformation during subsequent thermal processes. This research underscores the potential of concentrated solar irradiation as a sustainable method to initiate structural modifications in co-PAN fibers before conventional thermal treatments. The findings highlight the effectiveness of this approach in promoting early-stage chemical changes crucial for the fiber’s stabilization and subsequent processing. By leveraging solar energy for fiber modification, the study contributes to reducing environmental impact compared to traditional energy-intensive methods. Moreover, the detailed characterization through X-ray diffraction and spectroscopic techniques provides valuable insights into the mechanisms underlying the structural transformations induced by solar irradiation. Overall, this environmentally conscious approach not only enhances the efficiency of polyacrylonitrile fiber processing but also aligns with sustainable practices in materials science and engineering.</p>

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Solar influence on structural changes during thermal oxidative stabilization of polyacrylonitrile fiber

  • 期刊论文

  • 发表日期：

    2025年6月1日

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  • Sh. Nurmatov,
  • M. Rumi,
  • E. Urazaeva,
  • M. Zufarov,
  • E. Mansurova,
  • S. Gulmatov,
  • I. Mirzokhidov,
  • R. Urinboev,
  • Tonni Agustiono Kurniawan

摘要

An environmentally friendly approach utilizing concentrated solar irradiation as an energy source was explored for modifying polyacrylonitrile fiber (co-PAN) prior to thermal oxidative stabilization (TOS). The modified co-PAN fibers underwent thermal treatment within the temperature range of 220–240 °C, corresponding to the TOS stage. Structural changes were analyzed using X-ray diffraction, infrared spectroscopy, and thermal analysis techniques. The study revealed that the initial modification of co-PAN fibers significantly accelerated the cyclization of nitrile groups, thereby enhancing their chemical transformation during subsequent thermal processes. This research underscores the potential of concentrated solar irradiation as a sustainable method to initiate structural modifications in co-PAN fibers before conventional thermal treatments. The findings highlight the effectiveness of this approach in promoting early-stage chemical changes crucial for the fiber’s stabilization and subsequent processing. By leveraging solar energy for fiber modification, the study contributes to reducing environmental impact compared to traditional energy-intensive methods. Moreover, the detailed characterization through X-ray diffraction and spectroscopic techniques provides valuable insights into the mechanisms underlying the structural transformations induced by solar irradiation. Overall, this environmentally conscious approach not only enhances the efficiency of polyacrylonitrile fiber processing but also aligns with sustainable practices in materials science and engineering.