Using, as starting materials, fluid catalytic cracking decant oil (FDO), rich in short-chain alkyl groups, and synthetic naphthalene pitch (NP), with stable naphthenic structures, the synthesis of a spinnable mesophase pitch via a co-carbonization process was investigated. The effects of NP addition and the precursor molecular structure on properties of the resultant mesophase pitches and their carbon fiber derivatives were also discussed. With the increase of NP inclusion from 10 to 30 wt %, the solubility in toluene and quinoline and the optically anisotropic domain size of the synthesized pitches increase. However, the softening points of the resultant mesophase pitches decrease. In comparison to FDO, more naphthenic structures are retained in NP, and these show higher thermal stability during the preparation of mesophase pitch. The interaction of naphthenic structures in NP and short-chain alkyl groups in FDO promotes an increase in the molecular weight of the mesophase pitch prepared via co-carbonization and, in the present case, also increases the orientation and domain size in the resulting mesophase liquid crystal. The synthesized mesophase possesses a low softening point, good solubility, and 100 vol % mesophase content. Carbon fibers prepared from the co-carbonized mesophase pitch exhibit higher thermal conductivity than that of K-1100.

中文翻译：

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流体催化裂化Dec油与合成萘沥青共碳化制得的可纺中间相沥青

使用具有短环烷基结构的短链烷基丰富的流化催化裂化倾析油（FDO）和合成萘沥青（NP）作为起始原料，通过共碳化工艺合成了可纺中间相沥青调查。还讨论了NP的添加和前体分子结构对所得中间相沥青及其碳纤维衍生物的性能的影响。随着NP夹杂物从10wt％增加到30wt％，在合成的沥青中在甲苯和喹啉中的溶解度和光学各向异性域尺寸增加。但是，所得中间相沥青的软化点降低。与FDO相比，NP中保留了更多的环烷结构，在中间相沥青的制备过程中，它们显示出更高的热稳定性。NP中的环烷结构与FDO中的短链烷基的相互作用促进了通过共碳化制得的中间相沥青的分子量增加，在目前情况下，还增加了所得中间相液体的取向和畴尺寸水晶。合成的中间相具有低的软化点，良好的溶解性和100vol％的中间相含量。由共碳化的中间相沥青制备的碳纤维比K-1100具有更高的导热性。合成的中间相具有低的软化点，良好的溶解性和100vol％的中间相含量。由共碳化的中间相沥青制备的碳纤维比K-1100具有更高的导热性。合成的中间相具有低的软化点，良好的溶解性和100vol％的中间相含量。由共碳化的中间相沥青制备的碳纤维比K-1100具有更高的导热性。