The stabilization behaviors of Lignin/PAN-derived electrospun precursor fibers under the different temperatures and different heating rates were investigated to reveal the effects of oxygen structural unit of Lignin on the oxidation and cyclization reaction of fibers. The results indicated that the introduced Lignin could helpfully reduce the cyclization degree of fibers, accomplishing the stabilization process at a lower temperature. Meanwhile, the introduced Lignin could efficiently attenuate the exothermal rate of fibers, accomplishing the stabilization process with a higher heating rate. Moreover, the abundant oxygen-containing groups in Lignin acted as a free-radical scavenger to slow down the free radical cyclization rate of fibers in the low stabilization temperature stage (<240 °C), while the carboxyl group in Lignin served as an initiating agent to accelerate the ionic cyclization of fibers in the high stabilization stage (>280 °C). It has been established that the oxygen structural unit of Lignin could be a promising candidate to facilitate the stabilization behaviors of PAN-derived fibers.

研究了木质素/PAN衍生的电纺前驱体纤维在不同温度和不同加热速率下的稳定行为，以揭示木质素的氧结构单元对纤维氧化和环化反应的影响。结果表明，引入的木质素有助于降低纤维的环化度，在较低温度下完成稳定过程。同时，引入的木质素可以有效地减弱纤维的放热速率，以更高的加热速率完成稳定过程。此外，木质素中丰富的含氧基团作为自由基清除剂，在低稳定温度阶段（<240°C）减缓了纤维的自由基环化速率，而木质素中的羧基作为引发剂在高稳定阶段（> 280°C）加速纤维的离子环化。已经确定木质素的氧结构单元可能是促进 PAN 衍生纤维稳定行为的有希望的候选者。