Back to Search
Start Over
Oxidation of cellulose molecules toward delignified oxidated hot-pressed wood with improved mechanical properties.
- Source :
-
International Journal of Biological Macromolecules . Mar2023, Vol. 231, pN.PAG-N.PAG. 1p. - Publication Year :
- 2023
-
Abstract
- Wooden building materials have advantages in terms of biodegradability, non-toxicity, pollution-free and recycling. Currently, applications of natural wood are extremely limited because of low density, low strength and toughness. Therefore, we reported an effective modification strategy with nano-scale cellulose nanofibrils design to prepare a synergistically enhanced cellulosic material. Via three steps: i) the secondary alcohol hydroxyl groups in C 2 , C 3 position were cut; ii) oxidize the hydroxyl group at C 2 , C 3 position to achieve dialdehyde cellulose; and iii) oxidized again to obtain dicarboxylic cellulose. Subsequently, thanks to the regulation of the average moisture content, the moisture content in the wood surface and subsurface increased in a short time. The wood softening layer contributes to the hotpressing treatment of the wood. The mechanical properties and dimensionality have been greatly improved. The obtained delignified oxidated hot-pressed wood with 0.55 mmol/g carboxyl group content demonstrates excellent strength of 328.8 ± 7.43 MPa and Young's modulus of 8.1 ± 0.14 GPa, which is twice than that of natural wood. Delignified oxidated hot-pressed wood also shows exceptional toughness of 8.3 ± 0.28 MJ/m3. Other than that, the shore hardness indicates 0.55 mmol/g carboxylic group, which could increase the hardness at the wood surface hardness to 72.5 ± 4.29°. [ABSTRACT FROM AUTHOR]
- Subjects :
- *WOOD
*MOISTURE in wood
*CELLULOSE
*YOUNG'S modulus
*CARBOXYL group
*CELLULOSE fibers
Subjects
Details
- Language :
- English
- ISSN :
- 01418130
- Volume :
- 231
- Database :
- Academic Search Index
- Journal :
- International Journal of Biological Macromolecules
- Publication Type :
- Academic Journal
- Accession number :
- 161953553
- Full Text :
- https://doi.org/10.1016/j.ijbiomac.2023.123343