Resumo

AREVALO FUENTES, Rosven Libardo  e  HERNANDEZ, Roger. Extractive and anatomical wood structure effects on mechanical properties of Caoba wood (Swietenia macrophylla King). Colomb. for. [online]. 2008, vol.11, n.1, pp.137-147. ISSN 0120-0739.

The compression tangential to grain of samples of mahogany wood from Perú was examined at different relative humidity levels at 25 °C to determine the influence of both extractives and anatomical structure. Matched samples were used to assess the percentage of extractive components by extraction with solvents of increasing polarity: cyclohexane, dichloromethane, acetone, methanol and hot water. Additionally, fourteen anatomical parameters were determined by image analysis. Stepwise regression analysis concluded that mainly anatomical features, such as rays and vessels, rather than extractives, affect the mechanical behaviour of mahogany. These findings are agree with earlier results showing a negative effect of large and multiseriate rays on the mechanical properties of wood when loaded perpendicularly to their long axis. The influence of lumen located extracts soluble in dichloromethane might disallow deformations. Finally, it is postulated that hot water extracts may play a plasticizing role in this species.

Palavras-chave : sorption; equilibrium moisture content; mechanical properties; anatomic structure; extractives; Swietenia macrophylla.

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