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Title: From acetone fractionation to lignin-based phenolic and polyurethane resins

Journal Article · · Industrial Crops and Products
 [1];  [2];  [3];  [2]
  1. Univ. of Toronto, ON (Canada); Michigan State University
  2. Michigan State Univ., East Lansing, MI (United States)
  3. Univ. of Toronto, ON (Canada); Aalto Univ., Espoo (Finland)

In this paper, acetone fractionation was used to increase the homogeneity of softwood kraft lignin for product development. The acetone soluble and insoluble fractions were analyzed in terms of elemental composition, chemical structure, and thermal properties. The phenolic hydroxyl content of the acetone soluble fraction increased by 24%. The acetone soluble fraction of kraft lignin was used to fully substitute phenol in phenolic resin formulation. The resulting formulated lignin-formaldehyde adhesive showed higher adhesion strength (4.3 MPa) compared to a lab formulated phenol-formaldehyde resin (3.4 MPa) with 100% wood failure after lap shear test. On the other hand, the acetone insoluble lignin fraction, which had 23% higher aliphatic hydroxyl content compared to the starting lignin, was used to entirely replace petroleum-based polyol in polyurethane resin formulation. Then a bio-derived solvent (dihydrolevoglucosenone, Cyrene) was used to dissolve the acetone insoluble lignin fraction to synthesize lignin-based polyurethane resin. Tailoring the structure of kraft lignin through solvent fractionation resulted in two fractions, which were used to replace 100% of two major petrochemicals (phenol and polyol) in the formulations of phenolic and PU resins, that would otherwise be challenging due to the heterogeneity of softwood kraft lignin.

Research Organization:
Michigan State Univ., East Lansing, MI (United States)
Sponsoring Organization:
USDOE Office of Energy Efficiency and Renewable Energy (EERE)
Grant/Contract Number:
EE0008148
OSTI ID:
1878156
Journal Information:
Industrial Crops and Products, Journal Name: Industrial Crops and Products Vol. 178; ISSN 0926-6690
Publisher:
ElsevierCopyright Statement
Country of Publication:
United States
Language:
English

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