Dynamic viscoelastic properties of Chinese fir (Cunninghamia lanceolata) during moisture desorption processes
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Tianyi Zhan
Abstract
The viscoelasticity of Chinese fir (Cunninghamia lanceolata [Lamb.] Hook.) during moisture desorption processes were examined at 30°C and two relative humidity (RH) modes: RHramp-down mode from 85 to 0% RH, and RHisohume mode at 0, 30, and 60% RH, respectively. Dynamic viscoelastic properties were determined in a multi-frequency range of 1, 2, 5, 10, and 20 Hz. In both RH modes, desorption of water resulted in increasing stiffness and decreasing damping. The reduction in moisture content caused an unstable state in the cell wall due to the formation of free volumes in cell wall and rearrangement of hydrogen bonds within the polymer networks. Higher ramping rates resulted in greater destabilization, and the unstable state was more pronounced at a lower frequency. The ratio of storage modulus at 1 and 20 Hz remained unchanged during both RH modes. The ratios of loss modulus and loss factor at 1 and 20 Hz increased during the RHramp-down and decreased during the RHisohume period. The changes of loss modulus or loss factor ratios at two frequencies were suitable for evaluation of the unstable state. The instability was aggravated with reducing RH and slightly recovered at constant RH.
Acknowledgments
This study was completed at the State Key Laboratory of Forest Genetics and Tree Breeding and financially supported by Open Fund of State Key Laboratory of Forest Genetics and Tree Breeding (No. TGB2015005), Chinese Academy of Forestry, Beijing 100091, P.R. China.
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Articles in the same Issue
- Frontmatter
- Original Articles
- Elucidation of LCC bonding sites via γ-TTSA lignin degradation: crude milled wood lignin (MWL) from Eucalyptus globulus for enrichment of lignin xylan linkages and their HSQC-NMR characterization
- The impact of ionic strength on the molecular weight distribution (MWD) of lignin dissolved during softwood kraft cooking in a flow-through reactor
- Distinction of four Dalbergia species by FTIR, 2nd derivative IR, and 2D-IR spectroscopy of their ethanol-benzene extractives
- Content and distribution of lignans in Taiwania cryptomerioides Hayata
- Superior cellulose-protective effects of cosolvent during enhanced dissolution in imidazolium ionic liquid
- Hydrophobisation of wood surfaces by combining liquid flame spray (LFS) and plasma treatment: dynamic wetting properties
- Parametric study on the capability of three-dimensional finite element analysis (3D-FEA) of compressive behaviour of Douglas fir
- Dynamic viscoelastic properties of Chinese fir (Cunninghamia lanceolata) during moisture desorption processes
- Influence of incubation time on the vibration and mechanic properties of mycowood
- Fatigue behavior of wood-fiber-based tri-axial engineered sandwich composite panels (ESCP)
- Covalent fixation of boron in wood through transesterification with vinyl ester of carboxyphenylboronic acid
- Effect of fungal competition on decay rates in bicultured soil bottle assays
Articles in the same Issue
- Frontmatter
- Original Articles
- Elucidation of LCC bonding sites via γ-TTSA lignin degradation: crude milled wood lignin (MWL) from Eucalyptus globulus for enrichment of lignin xylan linkages and their HSQC-NMR characterization
- The impact of ionic strength on the molecular weight distribution (MWD) of lignin dissolved during softwood kraft cooking in a flow-through reactor
- Distinction of four Dalbergia species by FTIR, 2nd derivative IR, and 2D-IR spectroscopy of their ethanol-benzene extractives
- Content and distribution of lignans in Taiwania cryptomerioides Hayata
- Superior cellulose-protective effects of cosolvent during enhanced dissolution in imidazolium ionic liquid
- Hydrophobisation of wood surfaces by combining liquid flame spray (LFS) and plasma treatment: dynamic wetting properties
- Parametric study on the capability of three-dimensional finite element analysis (3D-FEA) of compressive behaviour of Douglas fir
- Dynamic viscoelastic properties of Chinese fir (Cunninghamia lanceolata) during moisture desorption processes
- Influence of incubation time on the vibration and mechanic properties of mycowood
- Fatigue behavior of wood-fiber-based tri-axial engineered sandwich composite panels (ESCP)
- Covalent fixation of boron in wood through transesterification with vinyl ester of carboxyphenylboronic acid
- Effect of fungal competition on decay rates in bicultured soil bottle assays
