caa a22 4500 463223500 CHVBK 20180405153219.0 cr unu---uuuuu 170326e20071001xx s 000 0 eng 10.1007/s10853-007-1781-9 doi (NATIONALLICENCE)springer-10.1007/s10853-007-1781-9 Flame retardancy of paulownia wood and its mechanism [Elektronische Daten] [Peng Li, Juhachi Oda] 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. Springer Science+Business Media, LLC, 2007 Li Peng Venture Business Laboratory, Kanazawa University, 920-1192, Kakuma, Kanazawa, Japan aut Oda Juhachi Graduate School of Natural Science & Technology, Kanazawa University, 920-1192, Kakuma, Kanazawa, Japan aut Journal of Materials Science Springer US; http://www.springer-ny.com 42/20(2007-10-01), 8544-8550 0022-2461 42:20<8544 2007 42 10853 https://doi.org/10.1007/s10853-007-1781-9 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s10853-007-1781-9 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Li Peng Venture Business Laboratory, Kanazawa University, 920-1192, Kakuma, Kanazawa, Japan aut NATIONALLICENCE 700 1- Oda Juhachi Graduate School of Natural Science & Technology, Kanazawa University, 920-1192, Kakuma, Kanazawa, Japan aut NATIONALLICENCE 773 0- Journal of Materials Science Springer US; http://www.springer-ny.com 42/20(2007-10-01), 8544-8550 0022-2461 42:20<8544 2007 42 10853 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer