Abstract
Soda lignin does not have thermal flowing characteristics and it is impossible for it to be further thermally molded. To achieve the fusibility of soda lignin for fiber preparation by melt-spinning, an effective method for soda lignin modification was conducted by cooking it with polyethylene glycol (PEG) 400 at various ratios. The higher the ratio of PEG that was used, the more PEG molecular chains were grafted at the alpha carbon of the soda lignin through ether bonds, resulting in lower thermal transition temperatures and more excellent fusibility. The modified soda lignin with a weight ratio of lignin to PEG of 1:4 exhibited a relative thermal stability of molten viscosity at selected temperatures. Thereafter, the resultant fusible soda lignin was successfully melt-spun into filaments with an average diameter of 33 ± 5 μm, which is smaller than that of some industrial lignins. Accordingly, it is possible to utilize soda lignin to produce fibrous carbonaceous materials.
Highlights
As the second most abundant renewable bio-resource, next to cellulose, on the earth, lignin was biosynthesized from the precursor of three monolignols and acted as one of the major cell wall components in higher plants
When the temperature was lower than 100 ◦ C, all the weights the soda lignin slightly decreased because of the loss of adsorbed water molecules, which were of the soda lignin slightly decreased because of the loss of adsorbed water molecules, which were derived from the ambient environment
4D)chain was through assigned to the methylene carbons bonded to the alphaa carbon on the soda lignin side assigned to the methylene carbons bonded to the alpha carbon on the soda lignin side chain through an ether linkage [27,28]. These results strongly suggested that the polyethylene glycol (PEG) chain was grafted at the alpha an ether linkage [27,28]. These results strongly suggested that the PEG chain was grafted at the alpha carbon of the soda lignin with an ether bond, which was in good accordance with the Fourier Transform Infrared Spectroscopy (FTIR) analysis
Summary
As the second most abundant renewable bio-resource, next to cellulose, on the earth, lignin was biosynthesized from the precursor of three monolignols and acted as one of the major cell wall components in higher plants. Hardwood acetic acid lignin and hardwood kraft lignin were fusible andbecould be into fibers without any further modification, while the other types of lignins could not directly melt-spun into filaments fibers without any further modification, while the other of ligninsbycould not converted into [12,13]. These differences in thermal behavior cantypes be explained be converted into filaments [12,13].
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