The oxidation of soda lignin extracted from sugar cane bagasse was studied in acid medium. Soda lignin was precipitated from black liquor by adding (36N) sulphuric acid until the pH of the resultant solution was close to 2. The resultant, dried, material was oxidized using hydrogen peroxide. Soda lignin oxidized at different times was investigated by CHNS and EDX chemical analysis, GPC, FTIR and solid state CP-MAS 13C NMR spectroscopy. Oxidation increased the amount of carboxylic groups, while that of associated carbohydrates decreased. In addition, self-condensation with increase of molecular weight was observed.
|Number of pages||7|
|Journal||Polymer Degradation and Stability|
|State||Published - Apr 2010|
Bibliographical noteFunding Information:
The authors acknowledge with thanks the financial support of the European Commission through the ALFA Program (Project LIGNOCARB-ALFA II 0412 FA FI), especially A. Mancera-Arias for the grants of her two internships in France. M.L. Antoine (ENSTIB, France) is thanked for technical support in the GPC experiments. The French authors also gratefully acknowledge the financial support of the CPER 2007–2013 “Structuration du Pôle de Compétitivité Fibres Grand'Est” (Competitiveness Fibre Cluster), through local (Conseil Général des Vosges), regional (Région Lorraine), national (DRRT and FNADT) and European (FEDER) funds.