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首页> 外文期刊>Journal of Applied Polymer Science >The role of structural evolution of polyacrylonitrile fibers during thermal oxidative stabilization on mechanical properties
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The role of structural evolution of polyacrylonitrile fibers during thermal oxidative stabilization on mechanical properties

机译：聚丙烯腈纤维在机械性能热氧化稳定期间结构演化的作用

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摘要

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/cm(3), but exceeding these ranges, a serious skin-core structure appeared.
机译：系统研究了聚丙烯腈（PAN）基碳纤维原丝在热氧化稳定化（TOS）过程中的化学和物理结构演变对稳定化纤维力学性能的影响。傅立叶变换红外光谱、广角X射线衍射和密度梯度柱分析结果表明，经过高温和长时间处理的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，纤维的结晶度和晶粒尺寸减小，而体积密度增加。力学性能结果表明，拉伸强度的降低与晶体结构的非晶化转变和环状结构的形成密不可分。当环化程度为80-83%，结晶度为34-45%，体积密度为1.33-1.35g/cm（3）时，纤维具有较好的结构稳定性，但超过这些范围，会出现严重的皮芯结构。

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