In the temperature range of 300-800℃, 40%-50% of the mass lost during the processing of polyacrylonitrile based carbon fiber (PANCF). Understanding the degradation behavior will be valuable in understanding the formation mechanism of pseudo-graphite structure, and providing theoretic basis for producing high performance carbon fiber and increasing the carbonization yield. The simulation of the degradation progress was carried out on the thermogravimetric analyzer (TGA), the results show that there are two degradation steps for PAN fiber stabilized in air, and controlled by cyclization coefficient and oxygen content. The cyclization coefficient and oxygen content are effective to the density of carbon fiber by influencing the degradation behavior, which cause defects in the fiber. The higher cyclization coefficient leads to form less structural defects and higher density of the fiber; on the contrary, the higher oxygen content leads to form more structural defects and lower density of the fiber.
YUSOF N , ISMAIL A F . Post spinning and pyrolysis processes of polyacrylonitrile (PAN)-based carbon fiber and activated carbon fiber: a review[J]. Journal of Analytical and Applied Pyrolysis, 2012, 93, 1- 13.
USAMI T , ITOH T , OHTANI H , et al. Structural study of polyacrylonitrile fibers during oxidative thermal degradation by pyrolysis-gas chromatography, solid-state 13C nuclear magnetic resonance, and fourier transform infrared spectroscopy[J]. Macromolecules, 1990, 23 (9): 2460- 2465.
JING M , WANG C G , WANG Q , et al. Chemical structure evolution and mechanism during pre-carbonization of PAN-based stabilized fiber in the temperature range of 350-600℃[J]. Polymer Degradation and Stability, 2007, 92 (9): 1737- 1742.
ZHANG X W , QIN F Z , TONG Y J , et al. Study on the degradation of pre-oxidized PAN fiber by using TGA-FTIR coupling technique[J]. Synthetic Fiber Industry, 2007, 30 (4): 64- 65.
RAHAMAN M S A , ISMAIL A F , MUSTAFA A . A review of heat treatment on polyacrylonitrile fiber[J]. Polymer Degradation and Stability, 2007, 92 (8): 1421- 1432.
QIN X Y , LU Y G , XIAO H , et al. A comparison of the effect of graphitization on microstructures and properties of polyacrylonitrile and mesophase pitch-based carbon fibers[J]. Carbon, 2012, 50 (12): 4459- 4469.
XIAO H , LU Y G , ZHAO W Z , et al. The effect of heat treatment temperature and time on the microstructure and mechanical properties of PAN-based carbon fibers[J]. Journal of Materials Science, 2014, 49 (2): 794- 804.