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Quality carbon fibers from fractionated lignin

Journal Article · · Green Chemistry
DOI:https://doi.org/10.1039/C6GC03555H· OSTI ID:3012080

The application of lignin carbon fibers was hindered by their low quality and mechanical performance. We addressed this challenge by developing a new approach to fractionate and modify lignin to produce quality carbon fibers using an enzyme-mediator system, which derives lignin fractions with different molecular weights, functional groups, and interunitary linkages. The fractionated lignin in general improves the miscibility and spinnability of lignin. In particular, the insoluble lignin fraction renders carbon fibers with a significantly improved turbostratic carbon structure as revealed by XRD and Raman spectroscopy. The improvement in the carbon structure leads to the significantly improved elastic modulus. The results suggest that higher molecular weights, less –OH groups, and more linear structures may contribute to the improved crystallization and mechanical performance of lignin carbon fibers. Finally, the technical breakthrough produces lignin-based carbon fibers with a similar elastic modulus to commercial carbon fibers for the first time, and paves the path for replacing PAN with lignin for producing quality carbon fibers.

Research Organization:
Texas A & M Univ., College Station, TX (United States)
Sponsoring Organization:
USDOE Office of Energy Efficiency and Renewable Energy (EERE)
Grant/Contract Number:
EE0007104; EE0006112
OSTI ID:
3012080
Alternate ID(s):
OSTI ID: 1535140
OSTI ID: 2525914
OSTI ID: 2532432
Journal Information:
Green Chemistry, Journal Name: Green Chemistry Journal Issue: 7 Vol. 19; ISSN 1463-9270; ISSN 1463-9262
Publisher:
Royal Society of ChemistryCopyright Statement
Country of Publication:
United States
Language:
English

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