Adhesion of fibers within a spun tow, including carbon fibers and precursors, is undesirable as it may interrupt the manufacturing process and entail inferior fiber properties. In this work, softwood kraft lignin was used together with a dissolving pulp to spin carbon fiber precursors. Lignin–cellulose precursors have previously been found to be prone to fiber fusion, both post-spinning and during carbon fiber conversion. In this study, the efficiency of applying different kinds of spin finishes, with respect to rendering separable precursors and carbon fibers, has been investigated. It was found that applying a cationic surfactant, and to a similar extent a nonionic surfactant, resulted in well separated lignin–cellulose precursor tows. Furthermore, the fiber separability after carbon fiber conversion was evaluated, and notably, precursors treated with a silicone-based spin finish generated the most well-separated carbon fibers. The underlying mechanism of fiber fusion post-spinning and converted carbon fibers is discussed.

中文翻译：

---

通过纺丝油剂应用防止木质素-纤维素前体和碳纤维的纤维-纤维粘附

纺丝丝束中的纤维（包括碳纤维和前体）的粘附是不希望的，因为它可能会中断制造过程并导致纤维性能较差。在这项工作中，软木牛皮纸木质素与溶解浆一起用于纺丝碳纤维前体。此前已发现木质素-纤维素前体在纺丝后和碳纤维转化过程中易于发生纤维融合。在这项研究中，研究了应用不同种类的纺丝油剂在提炼可分离前体和碳纤维方面的效率。结果发现，应用阳离子表面活性剂以及类似程度的非离子表面活性剂，可以得到良好分离的木质素-纤维素前体丝束。此外，对碳纤维转化后的纤维分离性进行了评价，值得注意的是，经过有机硅纺丝油剂处理的前体产生了分离效果最好的碳纤维。讨论了纺丝后纤维熔合和转化碳纤维的基本机制。