The micro-void structure transformation and properties assessment of polyacrylonitrile fibers irradiated by electron-beam as carbon fiber precursor

Polymer Testing

Weihua Liu¹  Feng Tian²  Zhongfeng Tang³  Hao Zhang⁴  Yi Ding⁴ 

[1] College of Textile Science and Engineering (International Institute of Silk), Zhejiang Sci-Tech University, Hangzhou 310018, China;Corresponding author. P.O. Box 800-204, Shanghai 201800, China. Tel/Fax: [phone].;College of Textile Science and Engineering (International Institute of Silk), Zhejiang Sci-Tech University, Hangzhou 310018, China;Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai 201800, China;

关键词: Polyacrylonitrile;    Fibers;    Radiation;    Cross-linking;    Degradation;    Small-angle X-ray scattering;   

DOI  :  

来源: DOAJ

【 摘 要 】

PAN fibers were irradiated by electron-beam at room temperature in air. The micro-void structure transformation and properties of irradiated PAN fibers were characterized using gel permeation chromatograph, small angle X-ray scattering, differential scanning calorimetry, thermogravimetric analysis and tensile strength. The cross-linking occurred dominantly, and the stable polymer network formed. The gel fraction got saturated at 200 kGy and did not further increase due to the oxidation degradation. The lateral size of micro-voids and the dose were negatively correlated while the length and misorientation of micro-voids expanded with dose increased (61.73 nm–201.06 nm, 7.79°–11.86°). The intense heat release of cyclization reaction was efficiently relieved by irradiation. Meanwhile, carbon yield at 800 °C also increased from 43% to 55% after irradiation at 200 kGy, which increased by 25% compared with original PAN fibers. This study can prefer irradiation conditions to improve PAN based carbon fiber property.

【 授权许可】

Unknown