Abstract
An understanding of wood’s moisture-dependent viscoelastic properties under various temperature conditions is important for assessing its utilization and product quality. In this study, we investigated the influence of moisture content (MC) on the orthotropic viscoelasticity of Chinese fir wood (Cunninghamia lanceolata [Lamb.] Hook.) during quenching ranging from 20 to −120°C. The storage modulus (E′) and loss factor (tan δ) of the longitudinal (L), radial (R) and tangential (T) specimens were determined for nine MC levels ranging from 0.6 to 60.0%. The results showed that E′ generally decreased with increasing amount of bound water in all orthotropic directions, regardless of the temperature. In contrast, a sharp increase in E′ was observed at temperatures below 0°C when free water was present, due to the formation of ice within the cell lumens. The γ-relaxation and β-relaxation were observed in the temperature spectrum. A comparison demonstrates that the β-relaxation showed evident grain orientation. When only bound water was present in the wood cell wall, one clear γ-relaxation was found for all orthotropic directions. In contrast, only the high-temperature side of the γ-relaxation was observed in the three anatomic directions in specimens with free water, which might be related to the amorphous wood cell wall coupling with the frozen free water during the quenching process. In addition, the differences in peak temperatures of the γ-relaxation among the three main directions diminished with increasing bound water.
Funding source: National Key Research and Development Program of China
Award Identifier / Grant number: 2017YFD0600202
Funding source: National Natural Science Foundation of China
Award Identifier / Grant number: 31570548
Funding statement: This work was financially supported by the National Key Research and Development Program of China (2017YFD0600202) and the National Natural Science Foundation of China (no. 31570548).
Author contributions: All the authors have accepted responsibility for the entire content of this submitted manuscript and approved submission.
Employment or leadership: None declared.
Honorarium: None declared.
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©2020 Walter de Gruyter GmbH, Berlin/Boston
Articles in the same Issue
- 10.1515/hf-2020-frontmatter1
- Original Articles
- Genotypic variation in the basic density, dynamic modulus of elasticity and tracheid traits of Pinus elliottii in three progeny trials in southern China
- Moisture-dependent orthotropic viscoelastic properties of Chinese fir wood during quenching in the temperature range of 20 to −120°C
- Comparison of whole-tree wood property maps based on near-infrared spectroscopic calibrations utilizing data at different spatial resolutions
- Variation and serial correlation of modulus of elasticity between and within European oak boards (Quercus robur and Q. petraea)
- Natural durability of subfossil oak: wood chemical composition changes through the ages
- Thermo-vacuum treatment of poplar (Populus spp.) plywood
- Dynamic moisture sorption and dimensional stability of furfurylated wood with low lignin content
- From hollow lignin microsphere preparation to simultaneous preparation of urea encapsulation for controlled release using industrial kraft lignin via slow and exhaustive acetone-water evaporation
- Short Note
- Lignan glycosides from the stems of Viburnum melanocarpum and their α-glucosidase inhibitory activity
Articles in the same Issue
- 10.1515/hf-2020-frontmatter1
- Original Articles
- Genotypic variation in the basic density, dynamic modulus of elasticity and tracheid traits of Pinus elliottii in three progeny trials in southern China
- Moisture-dependent orthotropic viscoelastic properties of Chinese fir wood during quenching in the temperature range of 20 to −120°C
- Comparison of whole-tree wood property maps based on near-infrared spectroscopic calibrations utilizing data at different spatial resolutions
- Variation and serial correlation of modulus of elasticity between and within European oak boards (Quercus robur and Q. petraea)
- Natural durability of subfossil oak: wood chemical composition changes through the ages
- Thermo-vacuum treatment of poplar (Populus spp.) plywood
- Dynamic moisture sorption and dimensional stability of furfurylated wood with low lignin content
- From hollow lignin microsphere preparation to simultaneous preparation of urea encapsulation for controlled release using industrial kraft lignin via slow and exhaustive acetone-water evaporation
- Short Note
- Lignan glycosides from the stems of Viburnum melanocarpum and their α-glucosidase inhibitory activity