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Title
Chemical modification and characterization of straw lignin
Authors
Elena Ungureanu Ovidiu Ungureanu Adina-Mirela Capraru and Valentin I. Popa
Received
May 11, 2009
Published
Volume 43 Issue 7-8 July-August
Keywords
wheat straw lignin, hydroxymethylation, FTIR, UV-VIS, fluorescence, HPLC, thermogravimetry
Abstract
This work aims at describing the modification and characterization of lignin separated from annual plants (wheat straw) by their delignification through the alkaline method. The lignin has been subjected to the hydroxymethylation reaction, for introducing hydroxyl groups into its structure, thus assuring a more complete exploitation of this natural aromatic polymer. Chemical and spectral analyses (FTIR, UV-VIS, fluorescence, HPLC), and thermal stability characterization (TG, DTG) have been carried out to evidence the transformations occurring in the lignin macromolecule. The experimental data show that the hydroxymethylation reaction induces the modification of lignin functionality and polymolecularity. Further, the properties of modified lignin were demonstrated in experiments on wood bioprotection.
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