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Carbon Fibers from Lignin-Cellulose Precursors: Effect of Stabilization Conditions
KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Fibre- and Polymer Technology.
RISE Mat & Prod, Box 104, SE-43122 Molndal, Sweden..
RISE Bioecon, Box 5604, SE-11486 Stockholm, Sweden..
RISE Bioecon, Box 5604, SE-11486 Stockholm, Sweden..
2019 (English)In: ACS SUSTAINABLE CHEMISTRY & ENGINEERING, ISSN 2168-0485, Vol. 7, no 9, p. 8440-8448Article in journal (Refereed) Published
Abstract [en]

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 degrees 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.

Place, publisher, year, edition, pages
AMER CHEMICAL SOC , 2019. Vol. 7, no 9, p. 8440-8448
Keywords [en]
Carbon fiber, Softwood kraft lignin, Fully bleached softwood kraft pulp, Stabilization, Ammonium dihydrogen phosphate, Dry jet wet spinning
National Category
Chemical Sciences
Identifiers
URN: urn:nbn:se:kth:diva-252615DOI: 10.1021/acssuschemeng.9b00108ISI: 000467351200048Scopus ID: 2-s2.0-85065403539OAI: oai:DiVA.org:kth-252615DiVA, id: diva2:1319636
Note

QC 20190603

Available from: 2019-06-03 Created: 2019-06-03 Last updated: 2019-06-03Bibliographically approved

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CiteExportLink to record
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  • apa
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