Abstract Although the heterogeneity of wood could preclude assessment of the performances of adhesion, the within-tree variations in its thermodynamic properties still remain unexplored. This study analyzed the surface free energy of wood (cW) calculated by the geometric mean approach along the radius and at different sampling heights in black spruce and balsam fir with a statistical model, employing apparent contact angles of three testing liquids. Sampling height and species affected the apparent contact angles, and consequently the polar (cP W) and dispersed (cD W) components of cW, but no significant difference was observed along the radius. On average, cW was 43.77 mJ m-2 at the stem base and gradually decreased, attaining 27.19 mJ m-2 at 14 m of height. cP W was markedly higher than cD W with an opposite pattern along the tree height. These findings demonstrated the huge variability in cW along the stem, which could be related to the structural or chemical features of wood.

Within-Tree variations in the surface free anergy of wood assessed by contact angle analysis

BETTERO, ANTONIO
2012

Abstract

Abstract Although the heterogeneity of wood could preclude assessment of the performances of adhesion, the within-tree variations in its thermodynamic properties still remain unexplored. This study analyzed the surface free energy of wood (cW) calculated by the geometric mean approach along the radius and at different sampling heights in black spruce and balsam fir with a statistical model, employing apparent contact angles of three testing liquids. Sampling height and species affected the apparent contact angles, and consequently the polar (cP W) and dispersed (cD W) components of cW, but no significant difference was observed along the radius. On average, cW was 43.77 mJ m-2 at the stem base and gradually decreased, attaining 27.19 mJ m-2 at 14 m of height. cP W was markedly higher than cD W with an opposite pattern along the tree height. These findings demonstrated the huge variability in cW along the stem, which could be related to the structural or chemical features of wood.
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11577/2423109
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