Lignin is a promising bio‐based precursor for sustainable carbon fibers. Limiting factors for their development include the brittleness of lignin and the lack of large‐scale production routes. Here, a simple and economic wet‐spinning method, suitable for the fabrication of fibers based on softwood Kraft lignin (KL) and polyvinyl alcohol (PVA), is proposed. These two polymers reveal a partial miscibility in solution, and form metastable dispersions in solid state. KL‐PVA fibers are prepared at a weight ratio of 70:30 and are carbonized without thermo‐stabilization. A tailor‐made temperature program leads to a decreased microporosity on the fiber surfaces. The obtained carbon structures at 1000 °C are found to be poorly ordered, leading to only intermediate mechanical and electrical properties. However, graphitic domains appear at temperatures above 1500 °C and indicate a high potential for the system.

中文翻译：

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木质素-聚乙烯醇前体纤维的湿纺和碳化

木质素是有前途的生物基可持续碳纤维的前体。它们发展的限制因素包括木质素的脆性和缺乏大规模生产路线。在此，提出了一种简单经济的湿法纺丝方法，该方法适用于制造基于软木牛皮纸木质素（KL）和聚乙烯醇（PVA）的纤维。这两种聚合物显示出在溶液中的部分混溶性，并形成固态的亚稳态分散体。KL-PVA纤维以70:30的重量比进行制备，并且碳化后没有热稳定作用。量身定制的温度程序会降低纤维表面的微孔率。发现在1000°C下获得的碳结构排列不整齐，仅导致中等的机械和电气性能。然而，