Characterization of carbon nanofiber mats produced from electrospun lignin-g-polyacrylonitrile copolymer.

Autor: Youe WJ; Division of Wood Chemistry & Microbiology, Korea Forest Research Institute, 57 Hoegiro, Dongdaemun-gu, Seoul 130-712, Republic of Korea., Lee SM; Division of Wood Chemistry & Microbiology, Korea Forest Research Institute, 57 Hoegiro, Dongdaemun-gu, Seoul 130-712, Republic of Korea., Lee SS; Division of Wood Chemistry & Microbiology, Korea Forest Research Institute, 57 Hoegiro, Dongdaemun-gu, Seoul 130-712, Republic of Korea., Lee SH; Department of Forest Biomaterials Engineering, College of Forest and Environment Sciences, Kangwon National University, Chuncheon 200-701, Republic of Korea., Kim YS; Division of Wood Chemistry & Microbiology, Korea Forest Research Institute, 57 Hoegiro, Dongdaemun-gu, Seoul 130-712, Republic of Korea. Electronic address: yongsikk@korea.kr.
Jazyk: angličtina
Zdroj: International journal of biological macromolecules [Int J Biol Macromol] 2016 Jan; Vol. 82, pp. 497-504. Date of Electronic Publication: 2015 Oct 13.
DOI: 10.1016/j.ijbiomac.2015.10.022
Abstrakt: The graft copolymerization of acrylonitrile (AN) onto methanol-soluble kraft lignin (ML) was achieved through a two-step process in which AN was first polymerized with an α,α'-azobisisobutyronitrile initiator, followed by radical coupling with activated ML. A carbon nanofiber material was obtained by electrospinning a solution of this copolymer in N,N-dimethylformamide, then subjecting it to a heat treatment including thermostabilization at 250°C and subsequent carbonization at 600-1400°C. Increasing the carbonization temperature was found to increase the carbon content of the resulting carbon nanofibers from 70.5 to 97.1%, which had the effect of increasing their tensile strength from 35.2 to 89.4 MPa, their crystallite size from 13.2 to 19.1 nm, and their electrical conductivity from ∼0 to 21.3 Scm(-1). The morphology of the mats, in terms of whether they experienced beading or not, was found to be dependent on the concentration of the initial electrospinning solution. From these results, it is proposed that these mats could provide the basis for a new class of carbon fiber material.
(Copyright © 2015 Elsevier B.V. All rights reserved.)
Databáze: MEDLINE
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