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Effects of thermo-hygro-mechanical densification on the surface characteristics of trembling aspen and hybrid poplar wood veneers |
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| Authors: | Papa Niokhor Diouf Tatjana StevanovicAlain Cloutier Chang-Hua FangPierre Blanchet Ahmed KoubaaNicolas Mariotti |
| Institution: | a Formerly Centre de recherche sur le bois, Université Laval, 2425 rue de la Terrasse, Québec, Canada G1V 0A6 b Centre de recherche sur le bois, Université Laval, 2425 rue de la Terrasse, Québec, QC, Canada G1V 0A6 c FPInnovations, 319 rue Franquet, Québec, QC, Canada G1P 4R4 d Chaire de recherche du Canada sur la valorisation la caractérisation et la transformation du bois, Université du Québec en Abitibi-Témiscamingue, Rouyn-Noranda, QC, Canada J9X 5E4 |
| Abstract: | The effect of thermo-hygro-mechanical (THM) densification temperature on the surface color, roughness, wettability, and chemical composition of trembling aspen (Populus tremuloides) and hybrid poplar (Populus maximowiczii × P. balsamifera) veneers was investigated. Veneers were subjected to four THM densification temperatures (160 °C, 180 °C, 200 °C, and 220 °C). Veneer color darkened with increasing THM densification temperature. Surface roughness decreased between 160 °C and 200 °C. Wettability decreased after THM densification, but no significant difference was found between treated specimens. ATR-FTIR and XPS results confirmed that THM densification caused major chemical changes in veneer surfaces, and more pronounced at temperatures higher than 160 °C. |
| Keywords: | Populus sp veneer Thermo-hygro-mechanical densification Surface color Surface roughness Surface wettability Surface chemistry |
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