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Inherent characteristics of the hygroscopicity of fiber and parenchyma of bamboo

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Abstract

To better understand the hygroscopic behavior of bamboo, at the cellular scale, the hygroscopicity of fibers and parenchyma cells was investigated using Dynamic vapor sorption, and the hygroscopic process was analyzed using mathematical models and dynamic data testing. In addition, the subcellular scale physical properties of bamboo were also studied, and the relationship between cellular physical properties and bamboo hygroscopicity was analyzed. The results demonstrated that the size of the microfibril aggregates at the transverse end of the fiber cells was uniform, the average elastic modulus of the cell wall was 22.47 ± 1.86 GPa, and the distribution of mechanical values was stable. There were differences in the aggregate size of the parenchyma cell wall layer, and the average elastic modulus of the cell wall was 17.28 ± 1.23 GPa. The hygroscopicity of fiber is lower than that of parenchyma cells. When relative humidity (RH) was 90%, the moisture content of parenchyma cells was 16.12%, which was 1.87% higher than that of fiber cells. The multi-layer moisture contents of the fiber and parenchyma cells calculated by the model were 10.91 and 12.25% when RH was 90%. In addition, dynamic adsorption showed that the parenchyma cells had a shorter sorption equilibrium time than fiber cells.

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Acknowledgments

The authors acknowledge the support of Natural Science Foundation of China (31770599), the 13th Five-Year the National Key Research and Development of China projects (2016YFD0600906) and the International Center for Bamboo and Rattan and its Lab for the test.

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Correspondence to Benhua Fei.

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Yuan, J., Chen, L., Chen, Q. et al. Inherent characteristics of the hygroscopicity of fiber and parenchyma of bamboo. Cellulose 29, 4951–4959 (2022). https://doi.org/10.1007/s10570-022-04599-2

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