Journal
POLYMER DEGRADATION AND STABILITY
Volume 179, Issue -, Pages -Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.polymdegradstab.2020.109264
Keywords
WAXD; PAN fiber; Radiation; Crystallite; Pre-oxidation
Categories
Funding
- Strategic Priority Research Program of the Chinese Academy of Science [XDA02030200]
- Science Challenge Project [TZ2018004]
- National Natural Science Foundation of China [11079048, 11805261]
Ask authors/readers for more resources
To accurately understand how irradiation treatment influences the crystal structure variation of polyacrylonitrile (PAN) fibers during the pre-oxidation process, the crystal structure evolution of the irradiated PAN fibers after pre-oxidation was investigated by synchrotron wide-angle X-ray diffraction (WAXD) at beamline BL16B1 in transmission geometry, using a three-slit system at the Shanghai Synchrotron Radiation Facility. By employing highly sensitive 2D WAXD analysis, we observed the deformation of the orientation structure in the irradiated PAN fibers. It was found that irradiation treatment can reduce the quasicrystal structure formed in the early stage of the pre-oxidation process (200-220 degrees C). Irradiation further enhanced the decrease in crystal size, crystallinity, and preferred orientation during the pre-oxidation. The diffraction peaks for PAN fibers at q = 12 nm(-1) and 20.7 nm(-1) almost disappeared at 260 degrees C; meanwhile, a new peak appeared for the irradiated samples at q = 18.2 nm(-1), indicating the formation of a graphite structure, which confirmed by Raman spectra. The results showed that irradiation treatment can accelerate the pre-oxidation reaction of PAN fiber, reduce the time required for pre-oxidation, and improve the properties of carbon fiber by reducing the crystal size and crystallinity. (C) 2020 Elsevier Ltd. All rights reserved.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available