Journal
INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES
Volume 11, Issue 8, Pages 2988-3001Publisher
MDPI
DOI: 10.3390/ijms11082988
Keywords
Kraft-AQ pulping lignin; characteristics; GPC; C-13-NMR
Funding
- Natural Science Foundation of China [30930073, 30871997, 30710103906]
- China Ministry of Education [111]
- Ministry of Science and Technology [973-2010CB732204]
- State Forestry Administration [200804015]
- China Scholarship Council [2009651012]
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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, C-13-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 beta-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.
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