Lignins as macromonomers for polyurethane synthesis: A comparative study on hydroxyl group determination

Carolina Andreia Cateto; Maria Filomena Barreiro; Alírio Egídio Rodrigues; Marie Christine Brochier‐Salon; Wim Thielemans; Mohamed Naceur Belgacem

doi:10.1002/app.28393

journal article May 20, 2008

Lignins as macromonomers for polyurethane synthesis: A comparative study on hydroxyl group determination

Carolina Andreia Cateto Maria Filomena Barreiro Alírio Egídio Rodrigues Marie Christine Brochier‐Salon Wim Thielemans

Mohamed Naceur Belgacem

Journal of Applied Polymer Science Vol. 109 No. 5 pp. 3008-3017 · Wiley

View at Publisher Save 10.1002/app.28393

Abstract

AbstractThe hydroxyl group contents of four technical lignins [Indulin AT (Meadwestvaco), Alcell (Repap), Curan 27‐11P (Borregaard LignoTech), and Sarkanda (Granit SA)] were investigated in view of their valorization as polyols in polyurethane synthesis. The different hydroxyl group contents were determined by the following methods: titration and 1H‐NMR, 13C‐NMR, and 31P‐NMR spectroscopy. The titration method chosen was on the basis of a standard method commonly used to characterize commercial polyols for polyurethanes synthesis. The values of the total and phenolic hydroxyl contents determined by the different techniques were found to be in good agreement. For the total hydroxyl contents, coefficients of variation of 5.6% (Alcell), 3.2% (Indulin AT), 2.3% (Sarkanda), and 6.2% (Curan 27‐11P) were established. For the phenolic hydroxyl contents, a good correlation was observed between data obtained from 31P‐NMR and 13C‐NMR for all lignin samples, except for the Sarkanda lignin, for which a relatively high coefficient of variation (12.6%) was found. For softwood lignins (Indulin AT and Curan 27‐11P), the phenolic hydroxyl content determined by 1H‐NMR was always lower than that deduced from 31P‐NMR and 13C‐NMR spectroscopy. © 2008 Wiley Periodicals, Inc. J Appl Polym Sci, 2008

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References

Details

Published: May 20, 2008
Vol/Issue: 109(5)
Pages: 3008-3017
License: View

Authors

C

Carolina Andreia Cateto

M

Maria Filomena Barreiro

A

Alírio Egídio Rodrigues

M

Marie Christine Brochier‐Salon

W

Wim Thielemans

M

Mohamed Naceur Belgacem

Cite This Article

Carolina Andreia Cateto, Maria Filomena Barreiro, Alírio Egídio Rodrigues, et al. (2008). Lignins as macromonomers for polyurethane synthesis: A comparative study on hydroxyl group determination. Journal of Applied Polymer Science, 109(5), 3008-3017. https://doi.org/10.1002/app.28393

Lignins as macromonomers for polyurethane synthesis: A comparative study on hydroxyl group determination

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