Color change and thermogravimetric analysis of thermally treated Eucalyptus grandis wood

Abstract

Eucalyptus grandis wood was thermally treated at two different temperatures (150 °C and 200 °C) in a muffle furnace with steam. The surface color change was measured right after the treatment and in wood samples stored for two years inside a carton box without light exposure. Samples were analyzed by thermogravimetry to detect variation of thermal degradation behavior for different treatment temperatures. Thermally treated wood was darker when compared to control samples. The storage time influenced the wood surface color, with the surface becoming darker and redder. Thermogravimetric analysis revealed a peak of wood degradation between 300 °C and 400 °C for thermally treated samples.

Properties of thermally modified teakwood

“…Between 100 ºC to 200 ºC, the temperature range where changes occur in the chemical bonds of the con-stituents of the wood and evaporation of extractives, there was low weight loss for both samples. Silva et al (2019) and Pereira et al (2013) also observed a small weight loss in this temperature range when investigating wood of Eucalyptus spp. by thermogravimetry.…”