publication . Article . 2012

Improved Lignin Polyurethane Properties with Lewis Acid Treatment

Hoyong Chung; Newell R. Washburn;
Open Access
  • Published: 16 May 2012
  • Publisher: American Chemical Society
  • Country: United States
Chemical modification strategies to improve the mechanical properties of lignin-based polyurethanes are presented. We hypothesized that treatment of lignin with Lewis acids would increase the concentration of hydroxyl groups available to react with diisocyanate monomers. Under the conditions used, hydrogen bromide-catalyzed modification resulted in a 28% increase in hydroxyl group content. Associated increases in hydrophilicity of solvent-cast thin films were also recorded as evidenced by decreases in water contact angle. Polyurethanes were then prepared by first preparing a prepolymer based on mixtures of toluene-2,4-diisocyanate (TDI) and unmodified or modifie...
Medical Subject Headings: technology, industry, and agriculturemacromolecular substancescomplex mixturesfood and beveragesfungi
free text keywords: General Materials Science, Lignin, chemistry.chemical_compound, chemistry, Polyethylene glycol, Polymerization, Prepolymer, Monomer, Polyurethane, Polymer chemistry, Chemical modification, Organic chemistry, Lewis acids and bases, Materials science
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