Journal
MATERIALS TODAY COMMUNICATIONS
Volume 1, Issue 1-2, Pages 1-8Publisher
ELSEVIER
DOI: 10.1016/j.mtcomm.2014.08.001
Keywords
Polyimide fiber; Carbonization; Chemical and aggregation structure; evolutions
Categories
Funding
- National Natural Science Foundation of China (NSFC) [51373008]
- Higher School Specialized Research Fund for Doctoral Priority Areas of Development Project [20130010130001]
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Two polyimide (PI) fibers with different chemical structures, pyromellitic dianhydride (PMDA)/4,4'-oxydianiline (ODA) and 3,3',4,4'-biphenyldianhydride (BPDA)/p-phenylenediamine(p-PDA)/2-(4aminophenyl)- 5-aminobenzimidazole (BIA) fibers, were prepared by wet-spinning process, and followedby carbonization with increasing temperature up to 1600 degrees C under a high-purity nitrogen atmosphere, resulting in PI-derived carbon fibers. The chemical structure evolutions were traced by Fourier transform infrared radiation spectrometer (FTIR), Elemental analyzer (EA), Thermogravimetry (TG) and the carbonization mechanism was discussed through the molecular simulation and thermo gravimetric-infraredradiation (TG-IR) analysis. The aggregation structure evolutions were characterized by X-ray diffraction (XRD), Raman and scanning electron microscope (SEM) analyses. The graphite structure was formed and gradually became ordered by increasing temperature, finally resulting in carbon fibers with high carbon contents over 95% and high carbon yields over 50 wt%. Moreover, the carbon yields and graphitization degrees strongly depended on the chemical structures of PI fibers. The carbon fiber derived from BPDA/pPDA/BIA demonstrated higher carbon yields, more ordered and more well-defined graphite structuresthan that derived from PMDA/ODA. (C) 2014 Elsevier Ltd. All rights reserved.
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