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Bio-cleaning improves the mechanical properties of lignin-based carbon fibers

Ghosh, T and Chen, J and Kumar, A and Tang, T and Ayranci, C (2020) Bio-cleaning improves the mechanical properties of lignin-based carbon fibers. In: RSC Advances, 10 (39). pp. 22983-22995.

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Official URL: https://dx.doi.org/ 10.1039/d0ra03412f


Production of carbon fibers (CF) using renewable precursors has gained importance particularly in the last decade to reduce the dependency on conventional petroleum-based precursors. However, pre-treatment of these renewable precursors is still similar to that of conventional ones. Little work is put into greener pre-treatments and their effects on the end products. This work focuses on the use of bio-cleaned lignin as a green precursor to produce CF by electrospinning. Bio-cleaned kraft lignin A (Bio-KLA) and uncleaned kraft lignin A (KLA) were used to explore the effect of bio-cleaning on the diameter and mechanical properties of lignin fibers and CF. The effect of electric field, lignin-to-poly(ethylene oxide) (PEO) ratio and PEO molecular weight (MW) were evaluated by 33 factorial design using Design of Experiment (DOE). The electrospinning process parameters were optimized to obtain a balance between high elastic modulus and small fiber diameter. The model predicted optimized conditions were 50 kV m-1 electric field, 95/5 lignin-to-PEO ratio and 1000 kDa MW of PEO. When compared to KLA, Bio-KLA CFs showed a 2.7-fold increase in elastic modulus, 2-fold increase in tensile strength and 30 decrease in fiber diameter under the same optimum conditions. The results clearly show that bio-cleaning improved the mechanical properties of lignin derived CF. This journal is © The Royal Society of Chemistry.

Item Type: Journal Article
Publication: RSC Advances
Publisher: Royal Society of Chemistry
Additional Information: Copy right for this article belongs to Royal Society of Chemistry
Keywords: Carbon fibers; Cleaning; Design of experiments; Elastic moduli; Electric fields; Electrospinning; Ethylene; Polyethylene oxides; Tensile strength, Electrospinning process; Factorial design; Fiber diameters; High elastic modulus; Optimized conditions; Optimum conditions; PEO molecular weight; Poly (ethylene oxide) (PEO), Lignin, Carbon Fibers; Cleaning; Electric Fields; Ethylene; Tensile Strength
Department/Centre: Division of Mechanical Sciences > Mechanical Engineering
Date Deposited: 23 Dec 2020 09:09
Last Modified: 23 Dec 2020 09:09
URI: http://eprints.iisc.ac.in/id/eprint/65924

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