info:eu-repo/semantics/article
Hydroxymethylation of technical lignins from South American sources with potential use in phenolic resins
Fecha
2019-03Registro en:
Taverna, María Eugenia; Felissia, Fernando Esteban; Area, Maria Cristina; Estenoz, Diana Alejandra; Nicolau, Verónica Viviana; Hydroxymethylation of technical lignins from South American sources with potential use in phenolic resins; John Wiley & Sons Inc; Journal of Applied Polymer Science; 136; 26; 3-2019; 1-12
0021-8995
CONICET Digital
CONICET
Autor
Taverna, María Eugenia
Felissia, Fernando Esteban
Area, Maria Cristina
Estenoz, Diana Alejandra
Nicolau, Verónica Viviana
Resumen
This work investigates the valorization of sodium lignosulfonate, kraft, and organosolv lignins from South America. A detailed characterization of the lignins and their chemical modification by hydroxymethylation through its reaction with formaldehyde
were performed. The characterization included measurements of moisture, ash, carbohydrate contents, elemental and thermogravimetric analysis, and functional groups, molar mass distributions by Fourier transform infrared spectroscopy, and size exclusion chromatography, respectively. Also, reactive aromatic hydrogens ( HAr) were quantified by the measurement of phenolic hydroxyl groups (P-OH) content by UV–Vis spectroscopy. The different initial formaldehyde/lignin weight ratios (0.07, 1.47), temperatures (40, 50, and 70 C), and pHs (9, 11); and the following of hydroxymethylation reactions by UV–Vis spectroscopy were investigated. All lignins resulted attractive for the use as replacement of phenol in phenolic resins, but sodium lignosulfonate was the most appropriate due to its water solubility. © 2019 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2019, 136, 47712.