According to the radial distribution characteristics of PAN pre-oxidized fiber, the optical density method which can quantitatively characterize the radial structure of pre-oxidized PAN fiber is established, taking advantage of the light-absorbing of PAN pre-oxidized structure. The results show that when the sample's width is 400 nm and the light intensity is 800 lx, the optical density method characterize the radial distribution characteristics of PAN pre-oxidized fibers the most effectively and accurately. Compared with the traditional skin-core structure characterization method, this method not only expresses the pre-oxidized degree in the same domain under different pre-oxidation processes, but also obtains the radial distribution of pre-oxidized degree. Applying this method to the process research of pre-oxidized PAN fiber, the results show that this method can reveal a correlation between the process and structure, indicating the optical density method as a new method for characterization of PAN pre-oxidized fiber can play an active role in the study of pre-oxidized PAN radial structure.
KIMIYOSHI , NAITO K . The effect of high-temperature vapor deposition polymerization of polyimide coating on tensile properties of polyacrylonitrile- and pitch-based carbon fibers[J]. Journal of Materials Science, 2013, 48 (17): 6056- 6064.
LIU X , ZHU C , GUO J , et al. Nanoscale dynamic mechanical imaging of the skin-core difference:from PAN precursors to carbon fibers[J]. Materials Letters, 2014, 128 (6): 417- 420.
LI C Q , XIAO Y , ZHAO H J , et al. The effect of oxidation structure on thermal stability of PAN based pre-oxidization fibers[J]. Transactions of Materials and Heat Treatment, 2015, 36 (5): 35- 38.
LV M Y , GE H Y , CHEN J , et al. Study on the chemical structure and skin-core structure of polyacrylonitrile-based fibers during stabilization[J]. Journal of Polymer Research, 2008, 16 (5): 513- 517.
JU A Q , LIU Z , LUO M , et al. Molecular design and pre-oxidation mechanism of acrylonitrile copolymer used as carbon fiber precursor[J]. Journal of Polymer Research, 2013, 20 (12): 1- 17.
SU C J , CAO A J , LUO S , et al. Evolution of the skin-core structure of PAN-based carbon fibers with high temperature treatment[J]. Carbon, 2013, 51 (1): 436- 437.
WANG X F , ZHANG Y G , QI M Z , et al. Optical densitometric study on the influence of pre-oxidation process on skin-core structure of polyacrylonitrile fiber[J]. Synthetic Fiber in China, 2011, 40 (8): 1- 4.
张琪. 预氧化过程中PAN纤维径向结构的形成机制[D].北京:北京化工大学, 2014.
ZHANG Q.The formation mechanism for the radial structure of PAN fiber during pre-oxidative stabilization[D].Beijing:Beijing University of chemical Technolgy.2014.