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Issue 18, 2016
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A study of poplar organosolv lignin after melt rheology treatment as carbon fiber precursors

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Abstract

Lignins from various poplar genotypes were isolated by using organosolv fractionation and subjected to rheological treatment at various temperatures. Physicochemical characterization of the lignin variants shows a broad distribution of glass transition temperatures, melt viscosity, and pyrolysis char residues. Rheological treatment at 170 °C induces lignin repolymerization accompanied with an increase in condensed linkages, molecular weights, and viscosities. In contrast, rheology testing at 190 °C results in the decrease in lignin aliphatic and phenolic hydroxyl groups, β-O-aryl ether linkages, molecular weights, and viscosity values. Lignin under air cooling generates more oxygenated and condensed compounds, but lower amounts of ether linkages than lignin cooled under nitrogen. Lignin with a lower syringyl/guaiacyl ratio tends to form more cross-linkages along with higher viscosity values, higher molecular weight and larger amounts of condensed bonds.

Graphical abstract: A study of poplar organosolv lignin after melt rheology treatment as carbon fiber precursors

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Publication details

The article was received on 07 Apr 2016, accepted on 31 May 2016 and first published on 16 Jun 2016


Article type: Paper
DOI: 10.1039/C6GC00977H
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Citation: Green Chem., 2016,18, 5015-5024

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    A study of poplar organosolv lignin after melt rheology treatment as carbon fiber precursors

    Q. Sun, R. Khunsupat, K. Akato, J. Tao, N. Labbé, N. C. Gallego, J. J. Bozell, T. G. Rials, G. A. Tuskan, T. J. Tschaplinski, A. K. Naskar, Y. Pu and A. J. Ragauskas, Green Chem., 2016, 18, 5015
    DOI: 10.1039/C6GC00977H

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