Principal Component Analysis of the Hydroxymethylation of Sugarcane Lignin: A Time-Depending Study by FTIR |
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| Authors: | Priscila Benar Adilson R. Gonçalves Dalmo Mandelli Márcia M. C. Ferreira Ulf Schuchardt |
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| Affiliation: | 1. Depto. Biotecnologia-Faculdade de Engenharia Química de Lorena , Cx. Postal 116, 12.600-000, Lorena, SP, Brazil;2. Instituto de Química - Universidade Estadual de Campinas , Cx. Postal 6154, 13.083-970, Campinas, SP, Brazil |
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| Abstract: | Abstract The hydroxymethylation of Acetosolv lignin from sugarcane bagasse was studied at 40°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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