中国塑料 ›› 2024, Vol. 38 ›› Issue (11): 53-56.DOI: 10.19491/j.issn.1001-9278.2024.11.009

• 材料与性能 • 上一篇    下一篇

预氧化程度对聚丙烯腈预氧化纤维结构与性能的影响

王俊, 葛媛(), 曹安然, 张守雷, 严泽同   

  1. 吉林建筑大学材料科学与工程学院,长春 130118
  • 收稿日期:2024-03-04 出版日期:2024-11-26 发布日期:2024-11-21
  • 通讯作者: 葛媛(1989—),女,讲师,从事聚丙烯腈基碳纤维研究,geyuan@jlju.edu.cn
    E-mail:geyuan@jlju.edu.cn
  • 基金资助:
    吉林省科技发展计划项目资助(YDZJ202301ZYTS282)

Effect of pre⁃oxidation degree on structure and properties of polyacrylonitrile thermal oxidative stabilized fiber

WANG Jun, GE Yuan(), CAO Anran, ZHANG Shoulei, YAN Zetong   

  1. School of Materials Science and Engineering,Jilin Jianzhu University,Changchun 130118,China
  • Received:2024-03-04 Online:2024-11-26 Published:2024-11-21
  • Contact: GE Yuan E-mail:geyuan@jlju.edu.cn

摘要:

通过在空气气氛下恒定牵伸PAN纤维,制备具有不同预氧化程度的预氧化纤维(基于傅里叶变换红外光谱用相对环化率表征预氧化程度),探究预氧化程度对预氧化纤维的化学结构、晶体结构、微观结构和力学性能的影响。结果表明,预氧化程度高于54.7 %时,共轭羰基出现且含量逐渐增大;预氧化程度为83.2 %时,纤维形成新的漫散射峰和序态结构,纤维横截面具有明显的径向不均匀结构现象,断裂伸长率较小;预氧化程度约为72.0 %时,可以获得结构缺陷少,力学性能较为良好的预氧化纤维。

关键词: 聚丙烯腈, 预氧化程度, 皮芯结构, 力学性能

Abstract:

Thermal oxidative stabilized (TOS) fibers with different pre⁃oxidation degrees were prepared by using constant draft polyacrylonitrile (PAN) fibers under air atmosphere according to the pre⁃oxidation degree obtained from the relative cyclization rate determined by Fourier⁃transform infrared spectroscopy. The effect of pre⁃oxidation degree on the chemical and crystal structures, microstructure, and mechanical properties of the resultant TOS fibers were investigated. The results indicated that the conjugated carbonyl groups began to form at a pre⁃oxidation degree greater than 54.7 % and tended to increase gradually. The TOS fibers exhibited new diffuse peaks and ordered structures at a pre⁃oxidation degree of 83.2 %, and their cross section presented an obvious radial non⁃uniform structure, so⁃called “skin⁃core structure” along with a decrease in the elongation at break. Therefore, the TOS fibers obtained a cyclization degree of 72 %, thus resulting in fewer structural defects and better performance.

Key words: polyacrylonitrile, pre?oxidation degree, skin?core structure, mechanical property

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