Citation
Rowell R. M., . and Ibach R. E., . Stable and durable wood products based on molecular modification. pp. 488-495. ISSN 0128-1283
Abstract
Stable and durable wood products can be produced by chemical modification at the molecular level. One modification that is effective in achieving these properties is by reacting both hardwoods and softwoods with acetic anhydride. The reaction takes place in the most accessible hydroxyl groups in the cell wall polymers. Lignin reacts the fastest followed by the hemicelluloses. Both are highly substituted. As the level of bonded acetyl increases dimensional stability increases and attack by fungi decreases. The threshold of fungal resistance is approximately 18 acetyl. The moisture in the cell wall may be too low to support fungal growth. This is a summary of several independent projects on the mechanism of property enhancement that were previously published in proceedings.
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Abstract
Stable and durable wood products can be produced by chemical modification at the molecular level. One modification that is effective in achieving these properties is by reacting both hardwoods and softwoods with acetic anhydride. The reaction takes place in the most accessible hydroxyl groups in the cell wall polymers. Lignin reacts the fastest followed by the hemicelluloses. Both are highly substituted. As the level of bonded acetyl increases dimensional stability increases and attack by fungi decreases. The threshold of fungal resistance is approximately 18 acetyl. The moisture in the cell wall may be too low to support fungal growth. This is a summary of several independent projects on the mechanism of property enhancement that were previously published in proceedings.
Additional Metadata
| Item Type: | Article |
|---|---|
| AGROVOC Term: | Hardwood |
| AGROVOC Term: | Softwood |
| AGROVOC Term: | Wood products |
| AGROVOC Term: | Chemical reactions |
| AGROVOC Term: | Acetylation |
| AGROVOC Term: | Lignins |
| AGROVOC Term: | Hemicellulose |
| AGROVOC Term: | Structural change |
| AGROVOC Term: | Resistance to fungicides |
| AGROVOC Term: | Resistance to temperature extremes |
| Depositing User: | Ms. Suzila Mohamad Kasim |
| Last Modified: | 24 Apr 2025 06:29 |
| URI: | http://webagris.upm.edu.my/id/eprint/24758 |
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