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 wi... | Find, read and cite all the research you need on Tech Science Press
Highlights
Polyurethanes can be prepared from a great variety of biorenewable polyols such as tannin [1,2,3,4,5,6,7] and lignin [8,9,10,11]
The reaction of a desulphurized kraft lignin with hexamethylene diamine and dimethyl carbonate has allowed the development of isocyanate-free polyurethane resins
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) 13C nuclear magnetic resonance (NMR), which have revealed the presence of urethane functions
Summary
Polyurethanes can be prepared from a great variety of biorenewable polyols such as tannin [1,2,3,4,5,6,7] and lignin [8,9,10,11]. Alternate chemical routes for preparing non-isocyanate-based polyurethanes exist. These were pioneered by Rokicki and Piotrowska [12] and may involve vegetable oil-derived materials as polyols derived from renewable resources [13]. The benzene ring can stabilize a possible negative charge of the phenoxide ion through resonance because it is formed by sp carbons, something which is more difficult in an aliphatic chain. This can lead to different behavior between aromatic and aliphatic hydroxyls in the preparation of isocyanate-free polyurethanes with kraft lignin
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