Contribution of lignin to the stress transfer in compression wood viewed by tensile FTIR loading
-
Hui Peng
,
Jiali Jiang
Abstract
To achieve efficient utilization of compression wood (CW), a deeper insight into the molecular interactions is necessary. In particular, the role of lignin in the wood needs to be better understood, especially concerning how lignin contributes to its mechanical properties. For this reason, the properties of CW and normal wood (NW) from Chinese fir (Cunninghamia lanceolata) have been studied on a molecular scale by means of polarized Fourier transform infrared (FTIR) spectroscopy, under both static and dynamic loading conditions. Under static tensile loading, only molecular deformations of cellulose were observed in both CW and NW. No participation of lignin could be detected. In relation to the macroscopic strain, the molecular deformation of the cellulose C-O-C bond was greater in NW than in CW as a reflection of the higher microfibril angle and the lower load taken up by CW. Under dynamic deformation, a larger contribution of the lignin to stress transfer was detected in CW; the molecular deformation of the lignin being highly related to the amplitude of the applied stress. Correlation analysis indicated that there was a direct coupling between lignin and cellulose in CW, but there was no evidence of such a direct coupling in NW.
Funding source: National Key Research and Development Program of China
Award Identifier / Grant number: 2017YFD0600202
Funding statement: This research was sponsored by the National Key Research and Development Program of China (2017YFD0600202). Hui Peng has a fellowship from the China Scholarship Council (CSC).
Acknowledgments
The authors wish to thank Liang Zhou (Anhui Agricultural University, China) for providing the wood samples. Dr. Jasna S. Stevanic RISE/Innventia AB, Sweden is acknowledged for technical support with the FTIR measurements.
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-2019-0206).
©2019 Walter de Gruyter GmbH, Berlin/Boston
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Articles in the same Issue
- Frontmatter
- An effective technique for constructing wood composite with superior dimensional stability
- Numerical analysis of moisture-induced strains and stresses in glued-laminated timber
- Contribution of lignin to the stress transfer in compression wood viewed by tensile FTIR loading
- Effect of enzymatic hydrolysis lignin on the mechanical strength and hydrophobic properties of molded fiber materials
- Investigating tool engagement in groundwood pulping: finite element modelling and in-situ observations at the microscale
- Defoliation by insects reduces the wood quality and cellulosic pulp production
- Effect of pulp fibers on the surface softness component of hygiene paper
- Cellulose triacetate from different sources: modification assessment through thermal and chemical characterization
- Incorporation of nano lignin reverse micelles on the transparency, UV-blocking and rheological properties of high-density polyethylene films
- Cellulose nanocrystals/silver nanoparticles: in-situ preparation and application in PVA films
- Larch-derived hierarchical nitrogen-doped carbon with echinus-like architecture for supercapacitor applications
