Abstract
Thermally stabilized polyacrylonitrile (PAN) fibers were produced by multi-stage thermal stabilization between 190 and 270 °C. X-ray diffraction (XRD) and Fourier Transform infrared (FT-IR) spectroscopy were used to investigate the structure of PAN fibers and the stabilized fibers. A new diffraction peak appears at 2θ = 23.2° in XRD pattern of the stabilized fibers besides the peaks in that of PAN fibers. The distinct structural changes were also observed from FT-IR spectra, the intensities in the 2,936–2,918, 2,244–2,236, and 1,451–1,446 cm−1 regions decrease remarkably, and new peaks occur at 1,594 and 1,700 cm−1 (shoulder-like peak) which correspond to the stretching vibration of C=N and C=O groups, respectively. The ultramicrotomy to prepare samples of PAN fibers and the stabilized PAN fibers was explored to characterize their microstructures by high-resolution transmission electron microscopy (HRTEM). The HRTEM images further verified the microstructural changes of PAN fibers during thermal stabilization, and the detailed information was given that thermal stabilization is accompanied by a new structure forming inside the crystallites in PAN fibers, and the (110) plane of PAN fibers transforms preferentially.
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Acknowledgements
We acknowledge sincerely Wen-Ning Chen and Zhong-Ling Zhang, who are working at Shandong Academy of Medical Science, for providing technical support in the process of preparing ultra-thin sections of fibers. We also thank National Ministry of Science and Technology for providing financial support.
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He, DX., Wang, CG., Bai, YJ. et al. Microstructural evolution during thermal stabilization of PAN fibers. J Mater Sci 42, 7402–7407 (2007). https://doi.org/10.1007/s10853-007-1838-9
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DOI: https://doi.org/10.1007/s10853-007-1838-9