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Enhancing the thermal stability of silica-mineralized wood via layer-by-layer self-assembly

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Abstract

Employing a combination of a layer-by-layer self-assembly and sol gel methods, a negatively charged silica sol was successfully deposited into the cell wall and cell cavity of wood by the electrostatic attraction of cationic polyelectrolytes. The physical and mechanical properties, microscopic morphology and the chemical structure of the silica-mineralized wood were characterized using mechanical testing, scanning electron microscopy (SEM–EDS), Fourier-transform infrared spectroscopy and X-ray diffraction (XRD). The thermal performance of the treated wood was investigated using a cone calorimeter, thermogravimetry analysis (TG). SEM images and XRD results showed that the mineralization layer of the treated wood had various forms of amorphous nano-SiO2 particles, which could be attributed to multi-layers of polyelectrolytes. The mechanical strength of the mineralized wood was greatly improved. Based on the TG results, the major thermal degradation (mass loss at about 50%) began at higher temperatures for the silica-mineralized wood. Fire resistance testing demonstrated that the maximum heat release rate of the modified wood was less than that of the untreated wood, indicating that the silica mineralized layer had effectively altered the combustion mechanism. In addition, this work also considered the hydrophobic properties of silica-mineralized wood. In conclusion, the thermal stability and dimensional stability of silica-modified wood was insignificantly improved.

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Acknowledgements

This work was funded by the National Natural Science Foundation of China (31770606), Major Science and Technology Program of Hunan Province of China (2017NK1010) and Postgraduate Science and Technology Innovation Fund of Central South University of Forestry and Technology.

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Authors and Affiliations

  1. School of Materials Science and Engineering, Central South University of Forestry and Technology, Changsha, 410011, Hunan, People’s Republic of China

    Tao Yang, Mingchu Xia, Shiyao Chen, Mingming Mu & Guangming Yuan

  2. Collaborative Innovation Center for Effective Utilizing of Wood and Bamboo Resource of China, Changsha, 410004, Hunan, People’s Republic of China

    Guangming Yuan

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  1. Tao Yang
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  2. Mingchu Xia
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  3. Shiyao Chen
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  4. Mingming Mu
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Contributions

YT and YG conceived and designed the experiments; XM, YT and CS carried out the laboratory experiments; YT, YG and MM analyzed the data, interpreted the results, prepared figures, and wrote the manuscript. All authors read and approved the final manuscript.

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Correspondence to Guangming Yuan.

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Yang, T., Xia, M., Chen, S. et al. Enhancing the thermal stability of silica-mineralized wood via layer-by-layer self-assembly. J Therm Anal Calorim 145, 309–318 (2021). https://doi.org/10.1007/s10973-020-09786-6

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  • DOI: https://doi.org/10.1007/s10973-020-09786-6

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