Improving crosslinking of stabilized polyacrylonitrile fibers and mechanical properties of carbon fibers by irradiating with γ-ray

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• 作者：Weizhe Zhao^a ; Yonggen Lu^a ; ^{yglu@dhu.edu.cn" class="auth_mail" title="E-mail the corresponding author} ; Jing Wang^a ; Qiang Chen^b ; Liangxiao Zhou^a ; Junqi Jiang^a ; Li Chen^a
• 关键词：Stabilized PAN fibers ; γray ; Crosslinking mechanism ; Thermal stability ; High carbon yield
• 刊名：Polymer Degradation and Stability
• 出版年：2016
• 出版时间：November 2016
• 年：2016
• 卷：133
• 期：Complete
• 页码：16-26
• 全文大小：4062 K

文摘

Polyacrylonitrile (PAN) fibers were stabilized continuously through a series of temperature zones, and the stabilized PAN fibers (SFs) taken out from different zones were irradiated with γ-ray, finally, some of the irradiated SFs were carbonized continuously. Structure changes of the SFs and mechanical properties of the derived carbon fibers were investigated. It is found that γ-ray not only could destroy the nitrile crosslinking bonds and form nitrile groups again in slight SFs, but could make more crosslinked structure including ether crosslinking and carbon-carbon crosslinking in slight and deep SFs, which improved thermal stability of the SFs and tensile strength of the carbon fibers. The irradiation also induced cyclization in short sequence in slight SFs, however, such a cyclization structure didn't significantly improve thermal stability.