Efeito da termorretificação nas propriedades físicas e químicas da madeira de Pinus caribaea

CERNE

Oliveira, Gisely de Lima¹  Santos, Wanessa Aparecida dos¹  Garcia, Rosilei Aparecida¹  Abreu, Heber dos Santos¹  Poubel, Dallyene da Silva¹ 

[1] Universidade Federal Rural do Rio de Janeiro, Seropédica, Brasil$$

关键词: Dimensional stability;    compression wood;    thermal modification.;   

DOI  :  10.1590/S0104-77602013000300005

来源: Universidade Federal de Lavras-UFLA

【 摘 要 】

This study evaluated the effect of the heat treatment on physical properties (density, equilibrium moisture content, mass loss, volumetric and linear swelling and shrinkage) and chemical composition of normal (opposite side) and compression wood of Pinus caribaea Morelet. Samples of 25 x 25 x 50 mm were heat-treated under two different temperatures: 200 and 220 ºC. The results indicated a reduction in equilibrium moisture content and swelling and shrinkage following heat treatment, independent of wood type. The compression wood showed higher longitudinal swelling than normal one, however, after heat treatment, the improvements were similar between both wood types. Samples heat-treated at 200 and 220 ºC had mass losses of 9.94 and 21.03 %, respectively. The heat treatment promoted a relative increase in lignin content and a decrease in holocellulose and α-cellulose contents, indicating the occurrence of thermal degradation of these components.

【 授权许可】

Unknown