Abstract
Wood is widely used as a construction material for many applications. To have knowledge about the thermal degradation characteristic of wood could be crucial for indoor and outdoor applications. Chemical treatments could improve the resistance of wood against fire and heat. In this study, to investigate the thermal properties of Oriental beech (Fagus orientalis) wood treated with 0,25%; 1% and 4,70% aqueous solutions of boric acid, borax, disodium octaborate tetrahydrate and mixtures of and in different proportions, thermogravimetric analysis, differential-thermogravimetry, and differentialthermal analysis were performed. Our results showed that borate treatment decreased the Tmax (maximum degradation temperature) and increased residual char amount. Higher concentration levels of borates resulted in higher char content of Oriental beech wood specimens. Residual char content of borate treated wood samples at fixed concentration of 4,70% ranked as in the following order: disodium octaborate tetrahydrate > boric acid + borax (7:3) > boric acid + borax (1:1) > boric acid > borax >Control. The highest residual char content was achieved for the sample impregnated with 4,70% disodium octaborate tetrahydrate among the all treated samples.
Highlights
Among the construction materials which are used by people wood holds a special place because of its impressive range of attractive properties, including low thermal extension, low density, and high enough mechanical strength (Bektha and Niemz 2003, Fabiyi and Ogunleye 2015, Elaieb et al 2015)
As seen in Figures, for the untreated Oriental beech wood, below 200 °C, there were no significant changes in the TG and differential thermogravimetry (DTG) curves, but from the differential thermal analysis (DTA) curves, nearly at 110 °C endothermic peaks corresponds to drying of the wood by the evaporation of physically adsorbed water was observed
Thermal behavior of Oriental beech wood treated with 0,25%; 1% and 4,70% aqueous solutions of BX, Boric acid (BA), BA+BX(1:1), BA+BX(7:3) and disodium octaborate tetrahydrate (DOT) was investigated by thermogravimetry analysis (TG), differential thermogravimetry (DTG), and differential thermal analysis (DTA) under argon atmosphere
Summary
Among the construction materials which are used by people wood holds a special place because of its impressive range of attractive properties, including low thermal extension, low density, and high enough mechanical strength (Bektha and Niemz 2003, Fabiyi and Ogunleye 2015, Elaieb et al 2015). In order to reduce flammability and provide safety, wood is treated with fire-retardant chemicals (Nussbaum 1988, Ellis and Rowell 1989, Mitchell 1993). It is well known that boron compounds work efficiently as fire retardant chemicals for cellulosic materials. The fire retardant effectiveness of boron compounds is a physical mechanism achieved by the formation of a coating or protective layer on the wood surface at high temperature, and by forming glassy films that may inhibit
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