Relation of chemical and mechanical properties ofEucalyptus nitenswood thermally modified in open and closed systems
| Autor: | Holger Militz, Tamás Hofmann, M. Fleckenstein, Maximilian Wentzel |
|---|---|
| Rok vydání: | 2018 |
| Předmět: |
040101 forestry
0106 biological sciences Materials science biology Atmospheric pressure Formic acid technology industry and agriculture Young's modulus 04 agricultural and veterinary sciences Degree of polymerization biology.organism_classification 01 natural sciences chemistry.chemical_compound symbols.namesake chemistry Chemical engineering 010608 biotechnology symbols 0401 agriculture forestry and fisheries Lignin General Materials Science Eucalyptus nitens Cellulose Chemical composition |
| Zdroj: | Wood Material Science & Engineering. 14:165-173 |
| ISSN: | 1748-0280 1748-0272 |
| Popis: | In the present work, Eucalyptus nitens was thermally modified in an open (atmospheric pressure) and a closed (under pressure) reactor system. The effect of the changes of the chemical composition on the mechanical properties was investigated. Hemicelluloses, cellulose, lignin, extractives, acetic acid, formic acid, total phenols and the cellulose degree of polymerization (DP) as well as modulus of elasticity (MOE) and modulus of rupture (MOR) were measured for each modification. The results indicated that the closed system modification, particularly at high pressure, presented stronger variations on the chemical structure of the modified wood than the modifications in the open system. In both modifications, MOR showed a better correlation with the chemical changes than the MOE, especially xylose, cellulose DP, lignin and total phenols. These correlations suggest a tendency of a more brittle wood in the closed system modification at high pressure than in the modifications in the open system. Result... |
| Databáze: | OpenAIRE |
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