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首页> 外文期刊>International Journal of Molecular Sciences >Improving Processing and Performance of Pure Lignin Carbon Fibers through Hardwood and Herbaceous Lignin Blends
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Improving Processing and Performance of Pure Lignin Carbon Fibers through Hardwood and Herbaceous Lignin Blends

机译：通过硬木和草本木质素共混物改善纯木质素碳纤维的加工和性能

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Lignin/lignin blends were used to improve fiber spinning, stabilization rates, and properties of lignin-based carbon fibers. Organosolv lignin from Alamo switchgrass ( Panicum virgatum ) and yellow poplar ( Liriodendron tulipifera ) were used as blends for making lignin-based carbon fibers. Different ratios of yellow poplar:switchgrass lignin blends were prepared (50:50, 75:25, and 85:15 w/w ). Chemical composition and thermal properties of lignin samples were determined. Thermal properties of lignins were analyzed using thermogravimetric analysis and differential scanning calorimetry. Thermal analysis confirmed switchgrass and yellow poplar lignin form miscible blends, as a single glass transition was observed. Lignin fibers were produced via melt-spinning by twin-screw extrusion. Lignin fibers were thermostabilized at different rates and subsequently carbonized. Spinnability of switchgrass lignin markedly improved by blending with yellow poplar lignin. On the other hand, switchgrass lignin significantly improved thermostabilization performance of yellow poplar fibers, preventing fusion of fibers during fast stabilization and improving mechanical properties of fibers. These results suggest a route towards a 100% renewable carbon fiber with significant decrease in production time and improved mechanical performance.
机译：木质素/木质素共混物用于改善纤维纺丝，稳定速率和木质素基碳纤维的性能。来自阿拉莫柳枝switch（Panicum virgatum）和黄杨（Liriodendron tulipifera）的有机溶剂木质素被用作制备木质素基碳纤维的混合物。制备了不同比例的黄杨树：柳枝l木质素混合物（50：50、75：25和85:15 w / w）。测定木质素样品的化学组成和热性质。使用热重分析和差示扫描量热法分析木质素的热性质。热分析证实柳枝gra和黄色杨木木质素形成可混溶的混合物，因为观察到单个玻璃化转变。木质素纤维是通过双螺杆挤出的熔融纺丝生产的。木质素纤维以不同的速率热稳定并随后碳化。与黄杨木质素混合可显着改善柳枝木质素的可纺性。另一方面，柳枝switch木质素显着改善了黄杨纤维的热稳定性能，防止了快速稳定过程中纤维的融合，并改善了纤维的机械性能。这些结果表明，向生产100％可再生碳纤维的途径将显着减少生产时间并改善机械性能。

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