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Preparation and Characterization of Modified Soda Lignin with Polyethylene Glycol

Beijing Key Laboratory of Wood Science and Engineering, Beijing Forestry University, Beijing 100083, China
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Materials 2016, 9(10), 822; https://doi.org/10.3390/ma9100822
Received: 4 August 2016 / Revised: 5 September 2016 / Accepted: 28 September 2016 / Published: 7 October 2016
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. View Full-Text
Keywords: soda lignin; polyethylene glycol; melt-spinning; fibers soda lignin; polyethylene glycol; melt-spinning; fibers
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Zhang, F.; Lin, J.; Zhao, G. Preparation and Characterization of Modified Soda Lignin with Polyethylene Glycol. Materials 2016, 9, 822.

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