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Processing, Modification and Application of Lignin

A special issue of Polymers (ISSN 2073-4360). This special issue belongs to the section "Polymer Processing and Engineering".

Deadline for manuscript submissions: closed (30 November 2024) | Viewed by 1414

Special Issue Editor

College of Chemical Engineering, Huaqiao University, Xiamen 361021, China
Interests: lignin; porous carbon; lignocellulose; carbon-based solid acid; platform chemicals

Special Issue Information

Dear Colleagues,

With the current depletion of fossil reserves and the ongoing environmental crisis, scientists have shifted their focus towards the development and utilization of bio-renewable resources. As a kind of sustainable and natural biopolymer with low cost and great potential, lignin has attracted much attention from researchers around the world. However, the high-value-added products derived from lignin are limited, mainly due to its complex and uneven structure as well as low reactivity. To valorize lignin with commercial importance, a Special Issue entitled “Processing, Modification and Application of Lignin” will be published in the open access journal Polymers (ISSN 2073-4360; IF: 4.967, Q1 in the WoS category of Polymer Science). Any paper focusing on the utilization of lignin is welcome to be submitted.

Dr. Linhuo Gan
Guest Editor

Manuscript Submission Information

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Keywords

  • lignin chemistry
  • lignin depolymerization
  • lignin-derived fine chemicals
  • lignin-based functional materials
  • lignocellulosic biomass

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Published Papers (1 paper)

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Research

15 pages, 3128 KiB  
Article
Switchable Solvent for Separation and Extraction of Lignin from Lignocellulose Biomass: An Investigation of Chemical Structure and Molecular Weight
by Debao Li, Letian Qi, Magdi E. Gibril, Yu Xue, Guihua Yang, Mengru Yang, Yujie Gu and Jiachuan Chen
Polymers 2024, 16(24), 3560; https://doi.org/10.3390/polym16243560 - 20 Dec 2024
Viewed by 964
Abstract
Lignin, the most abundant natural aromatic polymer, holds considerable promise for applications in various industries. The primary obstacle to the valorization of lignin into useful materials is its low molecular weight and diminished chemical reactivity, attributable to its intricate structure. This study aimed [...] Read more.
Lignin, the most abundant natural aromatic polymer, holds considerable promise for applications in various industries. The primary obstacle to the valorization of lignin into useful materials is its low molecular weight and diminished chemical reactivity, attributable to its intricate structure. This study aimed to treat lignocellulosic biomass using a switchable solvent (DBU–HexOH/H2O) derived from the non-nucleophilic superbase 1,8-diazabicyclo [5.4.0]undec-7-ene (DBU), which efficiently separates and extracts lignin from poplar wood. Additionally, it sought to characterize fundamental properties of the extracted switchable solvent lignin (SSL) and propose a mechanism for its separation. In comparison to milled wood lignin, SSL exhibits a greater molecular weight, superior homogeneity, and enhanced stability. The SSL sample was analyzed using spectroscopies including infrared spectroscopy, nuclear magnetic resonance, and X-ray photoelectron spectroscopy. The findings indicated that the structure of SSL was preserved, with the switchable solvent primarily cleaving the C–C and α-O-4 bonds, resulting in a low hydroxyl content, an elevated H/C ratio, and a reduced O/C ratio. The SSL was successfully prepared to lignin nanoparticles (LNPs) with size range of 531–955 nm. This paper presents a technique for processing lignocellulosic biomass using a switchable solvent, highlighting advancements in lignin’s structure and enhancing its use in the chemical sector. Full article
(This article belongs to the Special Issue Processing, Modification and Application of Lignin)
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