EFEITO DE TRATAMENTOS TERMOMECÂNICOS SOBRE A RESISTÊNCIA BIOLÓGICA DA MADEIRA PERANTE O ATAQUE DE FUNGOS
DOI:
https://doi.org/10.26512/ripe.v3i1.14410Keywords:
Thermomechanical treatment. wood. biological resistance.Abstract
The thermomechanical treatment is a process that allows wood densification, improving mechanical properties and reducing hygroscopicity. The objective of this study was to characterize and evaluate the biological resistance of wood about the attack of fungus that causes brown rot fungi and white rot fungi. The samples were subjected the thermomechanical treatment was done in a hydraulic press at 140 to 180°C. It was evaluated the biological resistance this wood about the attack of fungus that cause brown-rot fungi (Gloeophyllum trabeum) and white-rot fungi (Trametes versicolor). The samples were characterized by analysis of FTIR (Fourier transformer infrared spectroscopy), SEM (scanning electron microscopy) and TGA. The FTIR spectra analysis clearly identified a reduction of the band at 1700cm-1 with the thermomechanical treatment and attacked by fungus, occurring decrease of the lignin. However, the SEM characterization showed changed the morphology of samples. The thermogravimetric (TG) curves showed good thermal stability for the samples with thermomechanical treatment. It also showed a reduction the equilibrium moisture, revealed that the thermal treatments being adopted were effective in reducing hygroscopicity of wood and improving their thermal properties.
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