Abstract
Macromolecule deformations of the wood cell wall are of great significance for wood deformation and failure. In this paper, the deformation mechanisms of wood cell walls with different microfibril angles (MFAs) under longitudinal tensile load were investigated by the deformation responses of compression wood (CW) and normal wood (NW). The results indicated that the shift rates of the glucosidic bond and intramolecular hydrogen bond of the cellulose were lower for the CW sample than the NW sample, and no shift was observed in the position of the characteristic peak of the lignin in the spectrum of the CW and NW samples. Under dynamic deformation, the lignin in the wood participated in the stress transfer, and this effect was more pronounced in the CW sample with the larger MFA than the NW sample. In addition, the larger slippage deformation between the cellulose and matrix in the CW resulted in greater deformation of the CW sample than the NW sample. The differences of molecular deformations between CW and NW also could indirectly prove deformation mechanisms of different layers of cell wall, and then wall layer failure under longitudinal tensile stress.
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