Effect of heat treatment on physical, mechanical and chemical properties of angelim wood

Abstract

This study had the objective to heat treated angelim vermelho (red) wood and then to analyze its effects on the physical, mechanical and chemical properties of the wood. The wood was treated at 180 ºC and 215 °C for 20 min and 40 min in a muffle furnace. The basic density, shrinkage, anisotropy, the modulus of rupture and modulus of elasticity, as well as the holocellulose, lignin, extractives and ash content values were obtained for the treated and untreated (control) wood. The results indicated that the basic density was not changed and there was a decrease in volumetric shrinkage in the most severe treatment. The modulus of rupture did not change and the chemical analysis indicated a decrease in the holocellulose and extractives content resulting in lignin content percentage increase, mainly in the most severe test.

Dimensional stability and equilibrium moisture content of thermally modified hardwoods

“…Kurul and Gorgun (2022) modified YP at 180 °C for 3 hours and observed that TM reduces anisotropy, swelling and shrinkage. Hermida et al (2022) modified Dinizia excelsa Ducke wood at different temperatures (180 to 215 °C) and reported that the anisotropy of TMW ranged from 1.43 to 1.59. Menezes et al (2014) modified (140, 160, and 180 ºC) Corymbia citriodora and Eucalyptus saligna woods.…”

FTIR spectroscopy and technological characterization of heat treated Fraxinus excelsior wood

“…Heat treatment is a viable option to mitigate the undesirable wood characteristics, allowing its access to different markets (Rajković;Miklečić, 2019). This technique consists of heating the wood between 160 and 260ºC, combined with variables such as time (Paula et al, 2023), atmosphere (Bal, 2018;Sivrikaya et al, 2020), and pressure (Chung et al, 2017). The heat treatment consists of the partial degradation of its chemical constituents, mainly the hemicelluloses, reducing the hydrophilic sites and the water adsorption capacity (Senneca et al, 2020;Kubovský et al, 2020).…”