TG-DTA studies on wood treated with flame-retardants

Abstract

TG-DTA-T curves of Cunninghamia Lanceolata wood untreated and treated with¯ame-retardants were analyzed using the TG-DTA simultaneous method. Results showed that upon lowering the pyrolysis temperature, wood weight loss was reduced and char yield increased in the charring phase of the pyrolysis. The TG curves were further analyzed by the thermokinetic method to obtain thermokinetic parameters of the different phases during the wood pyrolysis and to derive a thermokinetic Equation. It was found that the activation energy in the drying phase was reduced and the activation energy in the charring or calcining phase varied for the different¯ame-retardants used. TG-DTA-Untersuchungen an Holz nach Behandlung mit FlammschutzmittelnTG-DTA-Kurven des Holzes von Cunninghamia Lanceolata wurden vor und nach der Behandlung mit Flammschutzsalzen aufgenommen und analysiert, wobei TG-und DTA-Kurven simultan verfolgt wurden. Es zeigte sich, daû sich bei Erniedrigung der Pyrolysetemperatur auch der Gewichtsverlust des Holzes verringerte und die Menge an Kohle wa Èhrend der Verkohlungsphase der Pyrolyse anstieg. Aus den TG-Kurven wurden mittels thermokinetischer Methoden die kinetischen Parameter fu Èr die verschiedenen Pyrolysephasen gewonnen und entsprechende thermokinetische Gleichungen aufgestellt. Die Aktivierungsenergie in der Trocknungsphase war erniedrigt, wa Èhrend sie fu Èr die u Èbrigen Phasen je nach Flammschutzmittel variierte.

Fractional Separation and Structural Features of Hemicelluloses From Sweet Sorghum Leaves

“…Thermal analysis is a simple, convenient, fast, and effective method for the study of pyrolysis and fire-retardants (Yunchu et al 2000). It has been reported that hemicelluloses are less thermally stable than cellulose and lignin, and that its active degradation takes place more readily at a relatively lower temperature (Demirbas 2000).…”

Autoignition and thermogravimetric analysis of forest species treated with fire retardants

“…The peak in the range of 200-280 • C corresponds mainly to hemicellulose decomposition, while the next one, between 320 and 370 • C, is related to cellulose decomposition [15,16]. The last peaks in the range of 370-550 • C are related to the lignin decomposition [15,16]. It should be noted that the profile of the DTG curves varies depending on the forest sample examined and in many cases an overlapping between the reactions taking place is observed.…”

“…The second in the range of 120-160 • C, appeared only in Cupressus sempervirens, is attributed to the evaporation of volatile constituents. The peak in the range of 200-280 • C corresponds mainly to hemicellulose decomposition, while the next one, between 320 and 370 • C, is related to cellulose decomposition [15,16]. The last peaks in the range of 370-550 • C are related to the lignin decomposition [15,16].…”

Flame Retardant Properties of Laminated Bamboo Lumber Treated with Monoammonium Phosphate (MAP) and Boric acid/Borax (SBX) Compounds

“…Thermal analysis is a method to study the relationship between the physical properties of substances and temperature variation under the automatic control program of temperature, which serves as evaluation criteria for flame retardant properties (Ozawa 2000;Hu et al 2000). Table 2 shows the initial decomposition temperatures (Ti), maximum degradation temperatures (Tm), and carbon residual rate of the untreated and treated LBL specimens.…”