当前位置：
X-MOL 学术
›
ACS Sustain. Chem. Eng.
›
论文详情
Our official English website, www.x-mol.net, welcomes your
feedback! (Note: you will need to create a separate account there.)
Carbon Fibers from Lignin-Cellulose Precursors: Effect of Stabilization Conditions
ACS Sustainable Chemistry & Engineering ( IF 7.1 ) Pub Date : 2019-04-10 00:00:00 , DOI: 10.1021/acssuschemeng.9b00108 Andreas Bengtsson 1 , Jenny Bengtsson 2 , Maria Sedin 3 , Elisabeth Sjöholm 3
ACS Sustainable Chemistry & Engineering ( IF 7.1 ) Pub Date : 2019-04-10 00:00:00 , DOI: 10.1021/acssuschemeng.9b00108 Andreas Bengtsson 1 , Jenny Bengtsson 2 , Maria Sedin 3 , Elisabeth Sjöholm 3
Affiliation
|
There is an increasing demand for lightweight composites reinforced with carbon fibers (CFs). Due to its high availability and carbon content, kraft lignin has gained attention as a potential low-cost CF precursor. CFs with promising properties can be made from flexible dry-jet wet spun precursor fibers (PFs) from blends (70:30) of softwood kraft lignin and fully bleached softwood kraft pulp. This study focused on reducing the stabilization time, which is critical in CF manufacturing. The impact of stabilization conditions on chemical structure, yield, and mechanical properties was investigated. It was possible to reduce the oxidative stabilization time of the PFs from about 16 h to less than 2 h, or even omitting the stabilization step, without fusion of fibers. The main reactions involved in the stabilization stage were dehydration and oxidation. The results suggest that the isothermal stabilization at 250 °C override the importance of having a slow heating rate. For CFs with a commercial diameter, stabilization of less than 2 h rendered in tensile modulus 76 GPa and tensile strength 1070 MPa. Impregnation with ammonium dihydrogen phosphate significantly increased the CF yield, from 31–38 to 46–50 wt %, but at the expense of the mechanical properties.
中文翻译：
木质素纤维素前体的碳纤维：稳定条件的影响
对用碳纤维（CFs）增强的轻质复合材料的需求不断增加。由于其高可用性和碳含量，牛皮纸木质素作为一种潜在的低成本CF前体受到了关注。可以用软木牛皮纸木质素和完全漂白的软木牛皮纸浆的混合物（70:30）制成的柔韧性干喷湿纺前体纤维（PFs）制成具有前途性能的CFs。这项研究的重点是减少稳定时间，这对于CF制造至关重要。研究了稳定化条件对化学结构，产率和机械性能的影响。可以将PF的氧化稳定时间从大约16 h减少到少于2 h，甚至可以省略稳定步骤，而不会发生纤维熔合。稳定阶段涉及的主要反应是脱水和氧化。结果表明，在250°C下保持等温稳定的重要性超过了缓慢加热速率的重要性。对于具有商业直径的CF，在76 GPa的拉伸模量和1070 MPa的拉伸强度下可实现不到2小时的稳定化。用磷酸二氢铵浸渍显着提高了CF的收率，从31–38 wt％增至46–50 wt％，但以机械性能为代价。
更新日期：2019-04-10
中文翻译：
木质素纤维素前体的碳纤维：稳定条件的影响
对用碳纤维（CFs）增强的轻质复合材料的需求不断增加。由于其高可用性和碳含量，牛皮纸木质素作为一种潜在的低成本CF前体受到了关注。可以用软木牛皮纸木质素和完全漂白的软木牛皮纸浆的混合物（70:30）制成的柔韧性干喷湿纺前体纤维（PFs）制成具有前途性能的CFs。这项研究的重点是减少稳定时间，这对于CF制造至关重要。研究了稳定化条件对化学结构，产率和机械性能的影响。可以将PF的氧化稳定时间从大约16 h减少到少于2 h，甚至可以省略稳定步骤，而不会发生纤维熔合。稳定阶段涉及的主要反应是脱水和氧化。结果表明，在250°C下保持等温稳定的重要性超过了缓慢加热速率的重要性。对于具有商业直径的CF，在76 GPa的拉伸模量和1070 MPa的拉伸强度下可实现不到2小时的稳定化。用磷酸二氢铵浸渍显着提高了CF的收率，从31–38 wt％增至46–50 wt％，但以机械性能为代价。
京公网安备 11010802027423号