Radiation-induced crosslinking of polyacrylonitrile fibers and the subsequent regulative effect on the preoxidation process |
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| Authors: | Weihua Liu Mouhua Wang Zhe Xing Yingna Qi Guozhong Wu |
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| Institution: | 1. Shanghai Institute of Applied Physics, Chinese Academy of Sciences, P.O. Box 800-204, Shanghai 201800, China;2. Graduate University of the Chinese Academy of Sciences, Beijing 100049, China;1. State Key Laboratory of Urban Water Resource and Environment, Harbin 150090, PR China;2. School of Municipal and Environmental Engineering, Harbin Institute of Technology, Harbin 150090, PR China;3. Shanxi Research Academy of Environmental Science, Taiyuan 030027, PR China;1. State Key Laboratory of Bioelectronics, School of Biological Science and Medical Engineering, Southeast University, Nanjing 210096, PR China;2. Laser Fusion Research Center, China Academy of Engineering Physics, Mianyang 621900, PR China;1. State Key Laboratory for Modification of Chemical Fibers and Polymer Materials, College of Materials Science and Engineering, Donghua University, Shanghai 201620, China;2. College of Chemistry, Chemical Engineering and Biotechnology, Donghua University, Shanghai 201620, China |
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| Abstract: | To investigate the radiation effect on polyacrylonitrile (PAN) fibers as well as on the preoxidation process, PAN fibers were irradiated by γ-rays at room temperature at 50–500 kGy in vacuum and then were thermally oxidized in air. Gel fraction determination indicated that γ irradiation led to the predominant crosslinking of PAN fibers, with G values (the number of event per 100 eV absorbed) of G(X)=0.28 and G(S)=0.16 for chain crosslinking and scission, respectively. It was found that irradiation caused a slight change in the crystal structure and tensile strength at low dose. Radiation led to a reduction of the onset temperature of cyclization reaction and moderated the exothermic behavior. The density of the PAN fibers after thermal oxidation was used to evaluate the preoxidation extent. It was proven that radiation could significantly accelerate the preoxidation process and consequently shortened the preoxidation time. Radiation crosslinking may have potential application in the production of PAN-based carbon fibers. |
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