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首页> 美国卫生研究院文献>Materials >A Comparison of Ethylene-Tar-Derived Isotropic Pitches Prepared by Air Blowing and Nitrogen Distillation Methods and Their Carbon Fibers
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A Comparison of Ethylene-Tar-Derived Isotropic Pitches Prepared by Air Blowing and Nitrogen Distillation Methods and Their Carbon Fibers

机译：吹气和氮气蒸馏法制备的乙烯-ar衍生的各向同性沥青及其碳纤维的比较

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摘要

Two isotropic pitches were prepared by air blowing and nitrogen distillation methods using ethylene tar (ET) as a raw material. The corresponding carbon fibers were obtained through conventional melt spinning, stabilization, and carbonization. The structures and properties of the resultant pitches and fibers were characterized, and their differences were examined. The results showed that the introduction of oxygen by the air blowing method could quickly increase the yield and the softening point of the pitch. Moreover, the air-blown pitch (ABP) was composed of aromatic molecules with linear methylene chains, while the nitrogen-distilled pitch (NDP) mainly contained polycondensed aromatic rings. This is because the oxygen-containing functional groups in the ABP could impede ordered stack of pitch molecules and led to a methylene bridge structure instead of an aromatic condensed structure as in the NDP. Meanwhile, the spinnability of the ABP did not decrease even though it contained 2.31 wt % oxygen. In contrast, the ABP had narrower molecular weight distribution, which contributed to better stabilization properties and higher tensile strength of the carbon fiber. The tensile strength of carbon fibers from the ABP reached 860 MPa with fiber diameter of about 10 μm, which was higher than the tensile strength of 640 MPa for the NDP-derived carbon fibers.
机译：通过吹气和氮气蒸馏方法，以乙烯焦油（ET）为原料，制备了两个各向同性的沥青。通过常规的熔融纺丝，稳定化和碳化获得相应的碳纤维。表征了所得沥青和纤维的结构和性能，并检查了它们的差异。结果表明，通过鼓风法引入氧气可以迅速提高沥青的收率和软化点。此外，吹气沥青（ABP）由具有直链亚甲基链的芳族分子组成，而氮气蒸馏沥青（NDP）主要包含缩聚的芳环。这是因为ABP中的含氧官能团可能会阻碍沥青分子的有序堆积，并导致形成亚甲基桥结构，而不是NDP中的芳香族稠合结构。同时，即使ABP含有2.31重量％的氧，其可纺性也不会降低。相反，ABP具有较窄的分子量分布，这有助于碳纤维更好的稳定性能和更高的拉伸强度。来自ABP的碳纤维的拉伸强度达到860 MPa，纤维直径约为10μm，高于NDP衍生的碳纤维的640 MPa的拉伸强度。

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