Carboxymethylcellulose from bleached organosolv fibers of Eucalyptus nitens: synthesis and physicochemical characterization
| Autor: | Betty Matsuhiro, Raúl González, Marcelo J. Kogan, Sergio A. Moya, Mauricio Yáñez-S, Rodrigo Torres, Julio Romero, Omar Uyarte, Santiago Maldonado, Daniel Serafine, Jorge Luengo |
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| Rok vydání: | 2018 |
| Předmět: |
Thermogravimetric analysis
Polymers and Plastics biology 010405 organic chemistry Pulp (paper) Sodium Organosolv chemistry.chemical_element Isopropyl alcohol 02 engineering and technology engineering.material 021001 nanoscience & nanotechnology biology.organism_classification 01 natural sciences 0104 chemical sciences chemistry.chemical_compound chemistry Sodium hydroxide engineering Eucalyptus nitens Cellulose 0210 nano-technology Nuclear chemistry |
| Zdroj: | Cellulose. 25:2901-2914 |
| ISSN: | 1572-882X 0969-0239 |
| DOI: | 10.1007/s10570-018-1766-7 |
| Popis: | The objective of the present study was to synthesize sodium carboxymethylcellulose from Eucalyptus nitens cellulose. The cellulose extraction was carried out in three stages. In the first stage, E. nitens wood was fractionated using an organosolv pretreatment (methanol–water 50% v/v, 45 min at 200 °C) followed by an alkaline extraction (NaOH, 1.5 M). Finally, the organosolv pulp was bleached using NaClO2 (1.3% w/v, pH 3.8). The bleached cellulose obtained was converted to sodium carboxymethylcellulose (NaCMC) by an etherification reaction in isopropanol medium. NaCMC structure, morphology and properties were researched using FTIR, 1H and 13C NMR spectroscopy, scanning electron microscopy, and thermogravimetric analysis. The results indicate substitution mostly occurred mostly at the C-6 position of 1 → 4 β-d-glucopyranosyl residues of cellulose chains. |
| Databáze: | OpenAIRE |
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