17.
Benar P., Mandelli D., Gonçalves A. R. C., Ferreria M. M. C., Schuchardt U., “PRINCIPAL COMPONENT ANALYSIS ON THE HYDROXYMETHYLATION OF SUGARCANE LIGNIN: A TIME-DEPENDING STUDY BY FTIR”. J. Wood Chem. Technol., 19(1-2), 151-165 (1999).
[Article.]

Abstract.
The hydroxymethylation of Acetosolv lignin from sugarcane bagasse was studied at 40 degrees C between 0.25 and 8 h by Fourier-transformed infrared
spectroscopy (FTIR). Principal Component Analysis (PCA) of the spectra has determined that addition of formaldehyde to the lignin fragments was
completed within 4 h. After that time, only condensation of the fragments occurs, leading to a resol-type crosslinked resin. PCA performed in selected regions
of the FTIR spectra showed that the same results are also obtained for the stretching region of O-H and C-H within the range from 2800 to 3800 cm(-1),
which is not usually considered in the spectroscopic evaluations of modified lignins.

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