Int. J. Mol. Sci. 2010, 11(8), 2988-3001; doi:10.3390/ijms11082988
Article

Molecular Characteristics of Kraft-AQ Pulping Lignin Fractionated by Sequential Organic Solvent Extraction

1email, 1email and 1,2,* email
Received: 30 June 2010; in revised form: 8 August 2010 / Accepted: 11 August 2010 / Published: 16 August 2010
(This article belongs to the Section Green Chemistry)
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
Abstract: Kraft-AQ pulping lignin was sequentially fractionated by organic solvent extractions and the molecular properties of each fraction were characterized by chemical degradation, GPC, UV, FT-IR, 13C-NMR and thermal analysis. The average molecular weight and polydispersity of each lignin fraction increased with its hydrogen-bonding capacity (Hildebrand solubility parameter). In addition, the ratio of the non-condensed guaiacyl/syringyl units and the content of β-O-4 linkages increased with the increment of the lignin fractions extracted successively with hexane, diethylether, methylene chloride, methanol, and dioxane. Furthermore, the presence of the condensation reaction products was contributed to the higher thermal stability of the larger molecules.
Keywords: Kraft-AQ pulping lignin; characteristics; GPC; 13C-NMR
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MDPI and ACS Style

Wang, K.; Xu, F.; Sun, R. Molecular Characteristics of Kraft-AQ Pulping Lignin Fractionated by Sequential Organic Solvent Extraction. Int. J. Mol. Sci. 2010, 11, 2988-3001.

AMA Style

Wang K, Xu F, Sun R. Molecular Characteristics of Kraft-AQ Pulping Lignin Fractionated by Sequential Organic Solvent Extraction. International Journal of Molecular Sciences. 2010; 11(8):2988-3001.

Chicago/Turabian Style

Wang, Kun; Xu, Feng; Sun, Runcang. 2010. "Molecular Characteristics of Kraft-AQ Pulping Lignin Fractionated by Sequential Organic Solvent Extraction." Int. J. Mol. Sci. 11, no. 8: 2988-3001.

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