Effects of oxidation treatment by KClO3/H2SO4 systems on the chemical, crystal and microscopic structures of polyacrylonitrile fibers,New Journal of Chemistry

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Effects of oxidation treatment by KClO3/H2SO4 systems on the chemical, crystal and microscopic structures of polyacrylonitrile fibers
New Journal of Chemistry ( IF 2.7 ) Pub Date : 2020-04-22 , DOI: 10.1039/d0nj00442a
Cheng Zhang _{1,

2,

3,

4,

5} , Shijie Xiao _{4,

6,

7} , Zhigang Shen _{4,

6,

7} , Runping Li _{1,

2,

3,

4,

8} , Jianhua Liu _{1,

2,

3,

4,

5} , Shenghui Guo _{1,

2,

3,

4,

5} , Lei Xu _{1,

2,

3,

4,

8}

Affiliation

The effects of various KClO₃ concentrations and durations on polyacrylonitrile (PAN) fibers were investigated. The oxidation treatment of PAN fibers (PFs) in a KClO₃/H₂SO₄ system is a new pretreatment method for carbon fiber oxidation stabilization. Wettability (droplet shape), chemical structures (Fourier transform infrared spectroscopy [FT-IR]), crystal structures (wide-angle X-ray diffraction), microscopic structures (scanning electron microscopy), and chemical components (X-ray photoelectron spectroscopy) were analyzed. The PFs had the smallest contact angle and the best wettability when the KClO₃ concentration was 15 wt%. FT-IR analysis showed that the absorption peak of the fibers was the lowest when the KClO₃ concentration was 15 wt%. The peak intensities of MPFs-15-60 and MPFs-15-90 at 2θ = 17° and 2θ = 29°, respectively, were close and lower than the peak intensities of others. The number of grooves present on the fiber surface decreased when the KClO₃ concentration was 15 wt%. As the KClO₃ concentration increased, the elemental C content decreased and the elemental O content increased. MPFs-15-60 had a low C content and the highest O content, indicating that it had the highest degree of oxidation. The best sample for PF oxidation treatment with KClO₃ was MPFs-15-60. The optimal processing conditions were a KClO₃ concentration of 15 wt% and duration of 60 min.

中文翻译：

KClO3 / H2SO4体系氧化处理对聚丙烯腈纤维化学，晶体和微观结构的影响

研究了各种KClO ₃浓度和持续时间对聚丙烯腈（PAN）纤维的影响。在KClO ₃ / H ₂ SO ₄体系中对PAN纤维（PFs）进行氧化处理是一种用于碳纤维氧化稳定化的新预处理方法。润湿性（液滴形状），化学结构（傅里叶变换红外光谱[FT-IR]），晶体结构（广角X射线衍射），微观结构（扫描电子显微镜）和化学成分（X射线光电子能谱）被分析。当KClO ₃时，PF具有最小的接触角和最佳的润湿性浓度为15重量％。FT-IR分析表明，当KClO ₃浓度为15wt％时，纤维的吸收峰最低。的MPF-15-60和的MPF-15-90在2的峰强度θ = 17°和2 θ = 29°，分别接近和比其他的峰强度降低。当KClO ₃浓度为15wt％时，存在于纤维表面上的沟槽的数量减少。随着KClO ₃浓度的增加，元素C含量降低，元素O含量增加。MPFs-15-60具有较低的C含量和最高的O含量，表明其氧化程度最高。用KClO ₃进行PF氧化处理的最佳样品是MPFs-15-60。最佳工艺条件为KClO ₃浓度为15 wt％，持续时间为60分钟。

更新日期：2020-04-22

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