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Erschienen in: Journal of Coatings Technology and Research 6/2019

22.04.2019

Antioxidant activity of unmodified kraft and organosolv lignins to be used as sustainable components for polyurethane coatings

verfasst von: Stephanie E. Klein, Jessica Rumpf, Abla Alzagameem, Matthias Rehahn, Margit Schulze

Erschienen in: Journal of Coatings Technology and Research | Ausgabe 6/2019

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Abstract

The antioxidative capacity of four different kraft lignins (KL) and one additional organosolv lignin (OSL) was studied using the Folin–Ciocalteu (FC) assay. To do so, the corresponding FC assay procedure was adapted and optimized to be appropriate for lignin analysis. Different solvents were tested, and DMSO and saturated sodium carbonate (Na2CO3) for pH adjustment showed the best results. The absorption wavelength of 740 nm was chosen due to highest determination coefficients. Continuous calibration is recommended on a daily basis to guarantee accuracy. The antioxidant capacity and related radical scavenging activity of various lignins were correlated with the biomass nature (soft wood vs grasses) and pulping methods (kraft vs organosolv). The results show higher antioxidant activity for kraft vs organosolv lignins. First lignin-derived polyurethane coatings were prepared using the unmodified kraft lignin. The films, prepared via spin coating, show a high flexibility and transparency.

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Metadaten
Titel
Antioxidant activity of unmodified kraft and organosolv lignins to be used as sustainable components for polyurethane coatings
verfasst von
Stephanie E. Klein
Jessica Rumpf
Abla Alzagameem
Matthias Rehahn
Margit Schulze
Publikationsdatum
22.04.2019
Verlag
Springer US
Erschienen in
Journal of Coatings Technology and Research / Ausgabe 6/2019
Print ISSN: 1547-0091
Elektronische ISSN: 1935-3804
DOI
https://doi.org/10.1007/s11998-019-00201-w

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