Three basic pitches were prepared by the distillation of ethylene tar at 200, 250, or 300 °C for 3 h. Spinnable pitches were produced from them using air-blowing followed by heat treatment at 330°C for 4 h and are designated P200AT, P250AT and P300AT, respectively. These three pitches, and stabilized fibers and carbon fibers produced from them were characterized by TG-MS, FT-IR, 13C-NMR, XRD, SEM, solubility tests and elemental analysis. The components and oxidation reactivity of the basic pitches, and its influence on the oxygen functionality and microstructures of the spinnable pitches and mechanical properties of the resulting carbon fibers were investigated. Results showed that with increasing distillation temperature the aliphatic carbon content and n-hexane and toluene solubility of the basic pitches decreased, while their aromaticity and planarity increased, and the oxidation reactivity reached a maximum at 250 °C. Of the three spinnable pitches P250AT had the highest softening point, highest carbon yield, oxygen content, and C=O content and the highest toluene insoluble fraction. However, the oxygen uptake of P250AT pitch fibers during stabilization was the lowest among the three. This led to a reduction of gas release during carbonization, and therefore the highest carbon yield, the smallest number of defects, the highest tensile strength and the lowest Young's modulus of all the carbon fibers.

通过在200、250或300℃下将乙烯焦油蒸馏3小时来制备三个基本沥青。通过吹气从中产生可纺沥青，然后在330°C下热处理4小时，分别命名为P200AT，P250AT和P300AT。通过TG-MS，FT-IR，13C-NMR，XRD，SEM，溶解度测试和元素分析对这三个沥青以及由它们制成的稳定纤维和碳纤维进行了表征。研究了基本沥青的成分和氧化反应性，及其对氧官能度和可纺沥青的微观结构以及所得碳纤维力学性能的影响。结果表明，随着蒸馏温度的升高，基本沥青的脂肪族碳含量以及正己烷和甲苯的溶解度均降低，而它们的芳香性和平面度增加，并且氧化反应性在250°C时达到最大值。在三个可纺沥青中，P250AT具有最高的软化点，最高的碳收率，氧含量和C = O含量，以及最高的甲苯不溶率。但是，在稳定过程中，P250AT沥青纤维的吸氧量是三者中最低的。这导致碳化过程中气体释放的减少，因此，所有碳纤维的碳产量最高，缺陷数量最少，拉伸强度最高，杨氏模量最低。在稳定过程中，P250AT沥青纤维的吸氧量最低。这导致碳化过程中气体释放的减少，因此，所有碳纤维的碳产量最高，缺陷数量最少，拉伸强度最高，杨氏模量最低。在稳定过程中，P250AT沥青纤维的吸氧量最低。这导致碳化过程中气体释放的减少，因此，所有碳纤维的碳产量最高，缺陷数量最少，拉伸强度最高，杨氏模量最低。