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Flame retardancy of paulownia wood and its mechanism

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Abstract

Paulownia wood (Pauloumia tomentosa) is a special kind of wood material in that it has especially excellent flame retardancy. Using this property, it has been commonly used to make clothing wardrobes for a long time in Japan. In this research, the flame retardancy of paulownia wood has been verified by heating experiments and cone calorimeter testing. The structure and tissue of the material have been analyzed by scanning electron microscope and other methods. Moreover, the mechanism of the flame retardancy of paulownia wood was analyzed by model experiments and FEM analysis. The result shows that the cell tissue of paulownia wood is very porous and similar to the structure of a honeycomb. It can be easily carbonized when heated. Since paulownia wood contains few lignins, it generates very little combustible gas when heated. Furthermore, when viewed from the radial section, the vessel structure of paulownia wood is very large and independent, compared to cedar wood (Cryptomeria japonica), which has a thin and continuous tracheids structure. Oxygen is not sufficiently supplied in this type of structure found in paulownia wood. Thus, it is difficult to ignite, and only carbonized when heated. Generally speaking, the thermal conductivity of the carbonization layer is lower than that of the wood material, which is the reason why wardrobes made of paulownia wood are able to protect kimonos from fire.

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Acknowledgments

We would like to thank Mr. Okabe and Mr. Machi for gratuitously supplying paulownia wood and information on paulownia wood products. We would also like to thank Mr. Tsuji, Mr. Onishi and Mr. Tada for their technical assistance. This work was supported by a Grants-in-Aid for Scientific Research (A) (No. 18206014) from the Japan Society for the Promotion of Science.

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Authors and Affiliations

  1. Venture Business Laboratory, Kanazawa University, Kakuma, Kanazawa, 920-1192, Japan

    Peng Li

  2. Research and Development Center, YKK Corporation, Yoshida 200, Kurobe, Toyama, 938-0005, Japan

    Peng Li

  3. Graduate School of Natural Science & Technology, Kanazawa University, Kakuma, Kanazawa, 920-1192, Japan

    Juhachi Oda

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  1. Peng Li
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  2. Juhachi Oda
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Correspondence to Peng Li.

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Li, P., Oda, J. Flame retardancy of paulownia wood and its mechanism. J Mater Sci 42, 8544–8550 (2007). https://doi.org/10.1007/s10853-007-1781-9

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  • DOI: https://doi.org/10.1007/s10853-007-1781-9

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