Open Access

ARTICLE

Polyurethanes from Kraft Lignin without Using Isocyanates

F.J. Santiago-Medina¹, M.C. Basso¹, A. Pizzi^1,2,*, L. Delmotte³

1 LERMAB, University of Lorraine, 27 rue Philippe Seguin, 88000 Epinal, France
2 Department of Physics, King Abdulaziz University, Jeddah, Saudi Arabia
3 Material Science Institute of Mulhouse, UMR CNRS 7361, University of Upper Alsace, 15 rue Jean Starcky, BP 2488, 68057 Mulhouse Cedex, France

*Corresponding author:

Journal of Renewable Materials 2018, 6(4), 413-425. https://doi.org/10.7569/JRM.2017.634172

Abstract

The reaction of a desulphurized kraft lignin with hexamethylene diamine and dimethyl carbonate has allowed the development of isocyanate-free polyurethane resins. The present research work is based on previous studies made with hydrolyzable and condensed tannins, but takes advantage of the higher number of hydroxyl groups present in lignin and their different aliphatic and aromatic character. The obtained materials were analyzed by Fourier transform infrared (FTIR) spectroscopy, matrix-assisted laser desorption ionization time-of-flight (MALDI-TOF) mass spectrometry and solid-state cross-polarization/magic angle spinning (CP MAS) 13 C nuclear magnetic resonance (NMR), which have revealed the presence of urethane functions. The interpretation of the results has shown a larger number of species than when tannins were used and has indicated the presence of two types of bonds in the new molecules formed: ionic and covalent bonds.

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Keywords

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