In this work, pyrolytic lignin (PL) was thermally co‐treated with polyethylene terephthalate (PET) to produce carbon fiber precursor. The produced PL‐PET precursors were thoroughly characterized and analyzed, and then being processed into carbon fiber. It was found that a novel precursor, rather than their physical blending, was formed by the thermal co‐treatment, indicating there were strong interactions between PL and PET. The novel PL‐PET precursors had enhanced thermal properties and rheological characteristics, therefore are more suitable for processing into better carbon fibers based on melt‐spinning method. In this study, the precursor fibers derived from the co‐treatment of PL and 5% PET were also stretched under tension during stabilization step to reduce the fiber diameter and improve molecular orientation. The resulting carbon fibers with an average diameter of 12.6 μm had the tensile strength of up to 1220 MPa. This work demonstrated that PET could be used to improve the processability and quality of lignin‐based carbon fiber when it is chemically bonded with lignin‐based precursor. © 2019 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2020, 137, 48843.

中文翻译：

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热解木质素和聚对苯二甲酸乙二醇酯对碳纤维生产的热处理

在这项工作中，热解木质素（PL）与聚对苯二甲酸乙二醇酯（PET）进行了热处理，以生产碳纤维前体。对生产的PL-PET前体进行彻底的表征和分析，然后将其加工成碳纤维。发现通过热处理可以形成一种新颖的前驱体，而不是它们的物理共混物，这表明PL和PET之间存在很强的相互作用。新型PL-PET前体具有增强的热性能和流变特性，因此更适合基于熔融纺丝法加工成更好的碳纤维。在这项研究中，在稳定步骤中，还将PL和5％PET的共处理衍生的前体纤维在张力下拉伸，以减小纤维直径并改善分子取向。所得的平均直径为12.6μm的碳纤维的拉伸强度高达1220MPa。这项工作表明，PET与木质素基前体化学键合后，可用于改善木质素基碳纤维的可加工性和质量。分级为4 +©2019 Wiley Periodicals，Inc.J.Appl。Polym。科学2020，137，48843。