Polyacrylonitrile copolymer (PAN) fiber and PAN/lignin (PL) fiber were wet spun from the PAN copolymer solution and PAN/Lignin blend solution using dimethyl sulphoxide (DMSO) solvent. A blend of 90% by weight (wt %) PAN terpolymer and 10wt% lignin dissolved in DMSO was used in wet spinning of PL fiber. Viscoelastic properties of PAN solution and PAN/lignin solution in DMSO were determined by rheometer. The properties of precursor fiber with and without lignin were evaluated by differential scanning calorimetry (DSC), Fourier transform infrared spectroscopy (FTIR) and mechanical testing. The diffusion of lignin out of coagulated filament was observed during wet spinning of PL solution and was quantitatively estimated by UV–Vis studies. DSC results showed that blending lignin with PAN copolymers can improve the thermal oxidation performance of the precursor fiber and accelerate the thermal stabilization process. A schematic illustration has been deduced for the decrease in tensile strength of PL fiber compared to that of PAN fiber.

使用二甲基亚砜（DMSO）溶剂从PAN共聚物溶液和PAN /木质素共混溶液中湿纺聚丙烯腈共聚物（PAN）纤维和PAN /木质素（PL）纤维。将90重量％（wt％）的PAN三元共聚物和10wt％的木质素溶解在DMSO中的共混物用于PL纤维的湿法纺丝。用流变仪测定PAN溶液和PAN /木质素溶液在DMSO中的粘弹性。通过差示扫描量热法（DSC），傅立叶变换红外光谱（FTIR）和机械测试来评估具有和没有木质素的前体纤维的性能。在PL溶液湿纺过程中观察到了木质素从凝固丝中的扩散，并通过UV-Vis研究进行了定量估计。DSC结果表明，将木质素与PAN共聚物共混可以改善前体纤维的热氧化性能，并加速热稳定过程。与PAN纤维相比，PL纤维的拉伸强度降低了。