Abstract
Orientation of copolymer polyacrylonitrile (PAN) chains during their deformation prior to stabilization and the further effect on the stabilization were investigated in detail. Results reveal that the orientation of PAN chains presents a saturation point of 69.51% when the deformation ratio reaches approximately 1.07, meanwhile the cyclization rather than the oxidation has a stronger dependence on the orientation of PAN chains during stabilization. The cyclization is facilitated that the cyclization degree is increasing while the activation energy is decreasing obviously as a consequence of the developing orientation of PAN fibers before the saturation point; however, it is restrained during the further deformation of PAN fibers after the point. The resulting carbon fibers obtained from the PAN fibers prepared at the saturation point possess the highest mechanical properties of 4.07 GPa in tensile strength and 249.0 GPa in tensile modulus.
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This work was financially supported by the National Natural Science Foundation of China (Nos. 51073011 and 50673011), the National High Technology Research and Development Program of China (“863 Program”, No. 2006AA06Z382) and the National Basic Research Program of China (“973 Program”, No. 2006CB605304).
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Liu, J., Lian, F., Ma, Zk. et al. Effects of deformation-induced orientation on cyclization and oxidation of polyacrylonitrile fibers during stabilization process. Chin J Polym Sci 30, 786–795 (2012). https://doi.org/10.1007/s10118-012-1165-8
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DOI: https://doi.org/10.1007/s10118-012-1165-8