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Type: Artigo de periódico
Title: Principal component analysis of the hydroxymethylation of sugarcane lignin: A time-depending study by FTIR
Author: Benar, P
Goncalves, AR
Mandelli, D
Ferreira, MMC
Schuchardt, U
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.
Country: EUA
Editor: Marcel Dekker Inc
Rights: fechado
Identifier DOI: 10.1080/02773819909349605
Date Issue: 1999
Appears in Collections:Artigos e Materiais de Revistas Científicas - Unicamp

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