Adding gaseous ammonia with heat treatment to improve the mechanical properties of spruce wood
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Yiqin Gao
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Li Li
Abstract
Degradation of the mechanical properties of heat-treated wood is a significant problem that needs to be addressed. This study aimed to stabilize the mechanical strength of heat-treated spruce wood by adding gaseous ammonia during the heat treatment. Gaseous ammonia penetrates rapidly into wood and is expected to form ammonium hydroxide when combined with water in the wood. This modification strategy neutralizes the acids produced by the degradation of hemicelluloses and reduces the degradation of the wood polymer composition and cell-wall structure. The preservation of wood polymer composition and cell-wall structure increases the indentation modulus of the wood cell walls. This increases the strength of the wood cell walls, resulting in an improvement in the mechanical properties of the heat-treated wood. The heat-treated wood’s dimensional stability and equilibrium moisture content are only slightly affected by the weak alkalinity modification.
Funding source: National Natural Science Foundation of China
Award Identifier / Grant number: 31971742
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Author contributions: All the authors have accepted responsibility for the entire content of this submitted manuscript and approved submission.
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Research funding: The authors acknowledge the support of the National Natural Science Foundation of China (grant number 31971742).
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Conflict of interest statement: The authors declare no conflicts of interest regarding this article.
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© 2023 Walter de Gruyter GmbH, Berlin/Boston
Artikel in diesem Heft
- Frontmatter
- Wood Physics/Mechanical Properties
- Effects of seismic strain rates on the perpendicular-to-grain compression behaviour of Dahurian larch, Mongolian pine and Chinese poplar: tests and stress-strain model
- The effect of the growth ring orientation on spring-back and set-recovery in surface-densified wood
- Synergistic improvement to dimensional stability of Populus cathay ana via hemicellulose removal/alkali lignin impregnation
- Adding gaseous ammonia with heat treatment to improve the mechanical properties of spruce wood
- Wood as a hydrothermally stimulated shape-memory material: mechanisms of shape-memory effect and molecular assembly structure networks
- Wood Chemistry
- Structural comparison of different isolated eucalyptus lignins and analysis of their interaction mechanism with bovine serum albumin solution under QCM-D
- Role of α-Fe2O3 nano-particles in protecting wood from ultraviolet light degradation
- Wood Science – Non-Tree Plants
- Radial distribution of vascular bundle morphology in Chinese bamboos: machine learning methodology for rapid sampling and classification
Artikel in diesem Heft
- Frontmatter
- Wood Physics/Mechanical Properties
- Effects of seismic strain rates on the perpendicular-to-grain compression behaviour of Dahurian larch, Mongolian pine and Chinese poplar: tests and stress-strain model
- The effect of the growth ring orientation on spring-back and set-recovery in surface-densified wood
- Synergistic improvement to dimensional stability of Populus cathay ana via hemicellulose removal/alkali lignin impregnation
- Adding gaseous ammonia with heat treatment to improve the mechanical properties of spruce wood
- Wood as a hydrothermally stimulated shape-memory material: mechanisms of shape-memory effect and molecular assembly structure networks
- Wood Chemistry
- Structural comparison of different isolated eucalyptus lignins and analysis of their interaction mechanism with bovine serum albumin solution under QCM-D
- Role of α-Fe2O3 nano-particles in protecting wood from ultraviolet light degradation
- Wood Science – Non-Tree Plants
- Radial distribution of vascular bundle morphology in Chinese bamboos: machine learning methodology for rapid sampling and classification
