通过聚合物共混物的凝胶纺丝设计坚固的多孔碳纤维,Carbon

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通过聚合物共混物的凝胶纺丝设计坚固的多孔碳纤维
Carbon ( IF 10.5 ) Pub Date : 2021-03-01 , DOI: 10.1016/j.carbon.2020.10.029
Jyotsna Ramachandran , Mingxuan Lu , Pedro J. Arias-Monje , Mohammad Hamza Kirmani , Narayan Shirolkar , Satish Kumar

摘要聚丙烯腈 (PAN) 与三种不同牺牲聚合物的共混物：聚（丙烯酸）（PAA）、聚（甲基丙烯酸甲酯）（PMMA）和聚（苯乙烯-共丙烯腈）（SAN），通过凝胶纺丝，取向通过拉伸过程，稳定和碳化以获得多孔碳纤维。平均孔径为 15 nm、31 nm、37 nm 和 115 nm 的碳纤维已从 PAN-PAA (90/10)、PAN-PMMA (90/10)、PAN-SAN (90/10) 和PAN-SAN (80/20) 前体纤维。由 PAN 和牺牲聚合物之间的相容性差异引起的孔径变化通过共混流变学和理论上使用相互作用参数值进行实验评估。尽管存在孔隙率，PAN-PAA (90/10) 和 PAN-PMMA (90/10) 的碳纤维仍表现出拉伸强度 (~1. 6 GPa) 与在类似条件下加工的无孔 PAN 基碳纤维相当。多孔碳纤维的比拉伸模量比 PAN 基碳纤维高 15-40%，并且由于高石墨有序性，导电率高达 74 kS/m。本研究中提出的多孔通道是通过将纳米/微米级范围内的相分离与通过凝胶纺丝实现的孔取向和伸长率相结合而获得的。

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Towards designing strong porous carbon fibers through gel spinning of polymer blends

Abstract Blends of polyacrylonitrile (PAN) with three different sacrificial polymers: poly (acrylic acid) (PAA), poly (methyl methacrylate) (PMMA), and poly (styrene-co-acrylonitrile) (SAN), were gel spun, oriented through the drawing process, stabilized and carbonized to obtain porous carbon fibers. Carbon fibers with an average pore diameter of 15 nm, 31 nm, 37 nm and 115 nm have been obtained from PAN-PAA (90/10), PAN-PMMA (90/10), PAN-SAN (90/10) and PAN-SAN (80/20) precursor fibers, respectively. The variation in pore size caused by the differences in compatibility between PAN and the sacrificial polymer was evaluated experimentally through blend rheology and theoretically using interaction parameter values. Despite their porosity, carbon fibers from PAN-PAA (90/10) and PAN-PMMA (90/10) exhibited tensile strength (∼1.6 GPa) comparable to that of the non-porous PAN based carbon fibers, processed under similar conditions. Specific tensile modulus of the porous carbon fibers was 15–40% higher than that for the PAN based carbon fibers, and the electrical conductivity was as high as 74 kS/m due to high graphitic ordering. Porous channels presented in this study were obtained by combining phase separation in the nano/micro scale range, with pore orientation and elongation achieved through gel spinning.

更新日期：2021-03-01

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