Radiation-induced crosslinking of polyacrylonitrile fibers and the subsequent regulative effect on the preoxidation process

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• 作者：Weihua Liu^a ; ^b ; Mouhua Wang^a ; Zhe Xing^a ; ^b ; Yingna Qi^a ; ^b ; Guozhong Wu^a ; ^{wuguozhong@sinap.ac.cn}
• 关键词：Polyacrylonitrile ; Fiber ; Irradiation ; Crosslinking ; Thermal property ; Preoxidation
• 刊名：Radiation Physics and Chemistry
• 出版年：2012
• 期刊代码：68_0969806x
• 类别：ph
• 出版时间：June, 2012
• 卷：81
• 期：6
• 页码：622-627
• 文件大小：399 K

摘要

To investigate the radiation effect on polyacrylonitrile (PAN) fibers as well as on the preoxidation process, PAN fibers were irradiated by 纬-rays at room temperature at 50-500 kGy in vacuum and then were thermally oxidized in air. Gel fraction determination indicated that 纬 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.