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The role of structural evolution of polyacrylonitrile fibers during thermal oxidative stabilization on mechanical properties
Journal of Applied Polymer Science ( IF 3 ) Pub Date : 2020-07-06 , DOI: 10.1002/app.49603
Yuan Ge 1 , Zhongyu Fu 1 , Mingyao Zhang 1 , Huixuan Zhang 1, 2
Affiliation  

The effects of chemical and physical structural evolution of polyacrylonitrile (PAN)‐based carbon fibers precursor during thermal oxidative stabilization (TOS) on the mechanical properties of stabilized fibers were systematically studied. The results of Fourier transform infrared spectroscopy, wide‐angle X‐ray diffraction, and density gradient column showed that the PAN fibers treated with high temperature and for long time have higher extent of cyclization, oxygen content, and crosslinking content. The crystallinity and crystallite size decreased with the increase of TOS time and temperature, whereas the bulk density of the stabilized fibers increased. The mechanical property results indicated that the decrease in tensile strength was inseparable from the formation of the cyclic structure and the amorphization transition of the crystal structure. The fibers have better structural stability when the extent of cyclization was 80–83%, the crystallinity was 34–45%, and the bulk density of stabilized fibers was 1.33–1.35 g/cm3, but exceeding these ranges, a serious skin‐core structure appeared.

中文翻译:

聚丙烯腈纤维在热氧化稳定过程中的结构演变对机械性能的作用

系统研究了基于聚丙烯腈(PAN)的碳纤维前体在热氧化稳定(TOS)过程中的化学和物理结构演变对稳定纤维的机械性能的影响。傅里叶变换红外光谱,广角X射线衍射和密度梯度色谱柱的结果表明,经高温长时间处理的PAN纤维具有较高的环化程度,氧含量和交联含量。随着TOS时间和温度的增加,结晶度和微晶尺寸减小,而稳定纤维的堆积密度增加。力学性能结果表明,抗拉强度的降低与环状结构的形成和晶体结构的非晶化转变是分不开的。3,但超出这些范围,出现了严重的皮肤核心结构。
更新日期:2020-07-06
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