Abstract

The composite PAN fibers which incorporated with CNTs and Titania were prepared by mean of wet spinning. These fibers were then pre-oxidized with microwave heating in an air atmosphere. A combination of characterizations was carried out to study the impact of nanoparticles fillers on the properties of as-spun fibers and their performance during the microwave pre-oxidation. The addition of an equal amount of fillers made obvious changes in the chemical and crystalline structure, consequently improves the strength, and this could lower the capability to creep over a wide range of temperatures in the subsequent processes. FTIR and NMR analyses results of the pre-oxidized fibers exhibited clear changes in the PAN structure, where the dehydrogenation reaction and the degree of cyclization were investigated. Additional confirmation of the occurrence of cyclization reaction was achieved by XRD and thermal analysis. According to the TGA results, the pre-oxidized CNT¹/Ti-PAN fibers exhibit greater thermal stability suggesting high carbon content and good quality could result in the dependent carbon fibers.

Graphic abstract

中文翻译：

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含碳纳米管和二氧化钛的复合PAN纤维及其在微波诱导的预氧化过程中的性能评估

摘要

通过湿法纺丝制备了结合有CNT和二氧化钛的复合PAN纤维。然后在空气气氛中用微波加热将这些纤维预氧化。进行了一系列表征，以研究纳米粒子填料对初纺纤维的性能及其在微波预氧化过程中的性能的影响。添加等量的填料会使化学和晶体结构发生明显变化，因此提高了强度，这可能会降低后续工艺在较大温度范围内蠕变的能力。经预氧化纤维的FTIR和NMR分析结果表明PAN结构发生了明显变化，研究了脱氢反应和环化程度。通过XRD和热分析进一步证实了环化反应的发生。根据TGA结果，预氧化的CNT¹ / Ti-PAN纤维表现出更高的热稳定性，表明高碳含量和良好的质量可能导致碳纤维的依赖性。

图形摘要