期刊
INDUSTRIAL CROPS AND PRODUCTS
卷 62, 期 -, 页码 67-76出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.indcrop.2014.08.013
关键词
Lignin; Thermal analysis; Glass transition temperature; Thermal degradation
资金
- USDA-NIFA [2010-34158-20938]
- USDA-CSREES [2007-34158-17640, 2005-35103-15243]
- NIFA [580666, 2010-34158-20938] Funding Source: Federal RePORTER
Three industrial lignins (Indulin AT Kraft softwood, Protobind 1000, and corn stover) were fractionated in methanol to obtain soluble and insoluble fractions. The original lignin and obtained lignin fractions were characterized chemically by a combination of FTIR spectroscopy, pyrolysis-gas chromatography-mass spectrum (py-GC-MS), and derivatization followed by reductive cleavage (DFRC). The methanol soluble lignin fractions contained fewer condensed structures than the original lignin and methanol insoluble fractions. The thermal (e.g. glass transition temperature (T-g) and thermal stability) and rheological properties of the lignins were characterized by a combination of DSC, TMA, TGA and parallel plate rheology. TMA and modulated temperature DSC (MTDSC) proved to be sensitive techniques in determining T-g. The methanol soluble lignin fractions had the lowest T-g values relative to the original lignin and methanol insoluble fractions. The original lignin and methanol insoluble fractions had a higher thermal degradation temperature relative to the methanol soluble lignin. Solvent partitioning offers a practical approach to fractionate lignin into low M-w and T-g fractions which show promise as starting materials for making lignin-copolymers. (C) 2014 Elsevier B.V. All rights reserved.
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