Caracterização tecnológica das madeiras de amescla e angelim-saia submetidas ao tratamento de acetilação

Abstract

This study aimed to evaluate the physical, mechanical and biological properties of the wood of amescla and angelim-saia. The acetylation treatment was performed by immersion in acetic anhydride over two distinct time periods 3 and 6 hours, with a constant temperature of 80°C. The time period of acetylation influenced significantly in the mass gain of wood, and the highest values were noticed for the 6 hours treatment. On the other hand, the density was not significantly influenced by the treatment time. In water absorption and volumetric shrinkage after the time of 2 hours, 24 hours and full saturation, the treatment of 6 hours was most effective. The mechanical property of Rockwell hardness demonstrated that the treated woods of both species had higher mechanical strength values. The acetylation of wood of amescla has provided increased biological resistance to xylophagous térmites, on the other hand, it has not been found a statistical difference for the mass loss of wood of angelim-saia.