Frequency-dependent viscoelastic properties of Chinese fir (Cunninghamia lanceolata) under hygrothermal conditions. Part 2: moisture desorption
Abstract
The frequency-dependent viscoelasticity of Chinese fir (Cunninghamia lanceolata) during moisture desorption was investigated and the applicability of the time-moisture superposition (TMS) relation on wood stiffness and damping during the moisture desorption was verified. The hygrothermal conditions for the moisture desorption were set up as six constant temperatures ranging from 30 to 80°C and three relative humidity (RH) levels at 0, 30 and 60%. Due to the elimination of water during the moisture desorption, the stiffness of the Chinese fir increased, whereas the damping decreased. With the increase in frequency, increased stiffness and decreased damping were observed. Utilizing the TMS relation, it was possible to construct master curves of wood stiffness at temperatures ranging from 30 to 80°C. The linear relationship between the shift factor and the moisture content (MC) manifested a low intermolecular cooperativity between the polymers and a narrow relaxation window. However, the TMS relation was not able to predict the wood damping properties during the moisture desorption, because wood is a multi-relaxation system. The non-proportional relationship between the free volume and MC during the moisture desorption may also explain why the TMS relation failed to construct master curves of the wood damping properties.
Funding source: National Natural Science Foundation of China
Award Identifier / Grant number: 31700487
Funding source: Natural Science Foundation of Jiangsu Province
Award Identifier / Grant number: BK20170926
Funding source: Nanjing Forestry University
Award Identifier / Grant number: CX2017002
Funding statement: This work was financially supported by the National Natural Science Foundation of China (funder id: http://dx.doi.org/10.13039/501100001809, no. 31700487), the Natural Science Foundation of Jiangsu Province (CN) (funder id: http://dx.doi.org/10.13039/501100004608, no. BK20170926), the Innovation Fund for Young Scholars of Nanjing Forestry University (CX2017002) and the Priority Academic Program Development of Jiangsu Higher Education Institutions (PAPD). Tianyi Zhan would like to gratefully acknowledge the financial support from the Jiangsu Provincial Government Scholarship Program.
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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Supplementary Material
The online version of this article offers supplementary material (https://doi.org/10.1515/hf-2018-0209).
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Artikel in diesem Heft
- Frontmatter
- Original Articles
- Influence of tree height on the hydrophilic and lipophilic composition of bark extracts from Eucalyptus globulus and Eucalyptus nitens
- Modelling the viscoelastic mechanosorptive behaviour of Norway spruce under long-term compression perpendicular to the grain
- Frequency-dependent viscoelastic properties of Chinese fir (Cunninghamia lanceolata) under hygrothermal conditions. Part 1: moisture adsorption
- Frequency-dependent viscoelastic properties of Chinese fir (Cunninghamia lanceolata) under hygrothermal conditions. Part 2: moisture desorption
- Evolution of extractive composition in thermally modified Scots pine during artificial weathering
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- Visual and machine strength grading of European ash and maple for glulam application
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Artikel in diesem Heft
- Frontmatter
- Original Articles
- Influence of tree height on the hydrophilic and lipophilic composition of bark extracts from Eucalyptus globulus and Eucalyptus nitens
- Modelling the viscoelastic mechanosorptive behaviour of Norway spruce under long-term compression perpendicular to the grain
- Frequency-dependent viscoelastic properties of Chinese fir (Cunninghamia lanceolata) under hygrothermal conditions. Part 1: moisture adsorption
- Frequency-dependent viscoelastic properties of Chinese fir (Cunninghamia lanceolata) under hygrothermal conditions. Part 2: moisture desorption
- Evolution of extractive composition in thermally modified Scots pine during artificial weathering
- Dynamic mechanical analysis (DMA) at room temperature of archaeological wood treated with various consolidants
- Visual and machine strength grading of European ash and maple for glulam application
- Evaluation of bond strength of cross-laminated LSL specimens under short-span bending