Tuning the Properties of Biobased PU Coatings via Selective Lignin Fractionation and Partial Depolymerization.

ABSTRACT: Polyurethane (PU) coatings with high lignin content and tunable properties were made using a combination of fractionation and partial catalytic depolymerization as a novel strategy to tailor lignin molar mass and hydroxyl group reactivity, the key parameters for use in PU coatings. Acetone organosolv lignin obtained from pilot-scale fractionation of beech wood chips was processed at the kilogram scale to produce lignin fractions with specific molar mass ranges (M_w 1000-6000 g/mol) and reduced polydispersity. Aliphatic hydroxyl groups were distributed relatively evenly over the lignin fractions, allowing detailed study of the correlation between lignin molar mass and hydroxyl group reactivity using an aliphatic polyisocyanate linker. As expected, the high molar mass fracti

SUBMITTER: Smit AT 

PROVIDER: S-EPMC10171370 | biostudies-literature | 2023 May

REPOSITORIES: biostudies-literature