Gomes, F.S.; Reis, M.S.; Rupf, A.C.O.; Silvares, P.H.S.; Ferreira, J.S.S.; Dias, L.C.; Madi, J.P.S.; Cademartori, P.H.G.; Neto, H.F.; Paes, J.B.; Batista, D.C. Chemical Composition and Color of Short-Rotation Teak Wood Thermally Modified in Closed and Open Systems. Appl. Sci.2023, 13, 13050.
Gomes, F.S.; Reis, M.S.; Rupf, A.C.O.; Silvares, P.H.S.; Ferreira, J.S.S.; Dias, L.C.; Madi, J.P.S.; Cademartori, P.H.G.; Neto, H.F.; Paes, J.B.; Batista, D.C. Chemical Composition and Color of Short-Rotation Teak Wood Thermally Modified in Closed and Open Systems. Appl. Sci. 2023, 13, 13050.
Gomes, F.S.; Reis, M.S.; Rupf, A.C.O.; Silvares, P.H.S.; Ferreira, J.S.S.; Dias, L.C.; Madi, J.P.S.; Cademartori, P.H.G.; Neto, H.F.; Paes, J.B.; Batista, D.C. Chemical Composition and Color of Short-Rotation Teak Wood Thermally Modified in Closed and Open Systems. Appl. Sci.2023, 13, 13050.
Gomes, F.S.; Reis, M.S.; Rupf, A.C.O.; Silvares, P.H.S.; Ferreira, J.S.S.; Dias, L.C.; Madi, J.P.S.; Cademartori, P.H.G.; Neto, H.F.; Paes, J.B.; Batista, D.C. Chemical Composition and Color of Short-Rotation Teak Wood Thermally Modified in Closed and Open Systems. Appl. Sci. 2023, 13, 13050.
Abstract
Although the effect of thermal modification (TM) on teak wood color is well documented, a few studies were carried out in closed system processes, as well as it remains unclear the effect of different processes on the same material. This work aimed to verify the effect of closed and open system processes of TM on the color of fast-growing teak wood. Thermally modified wood was evaluated in a closed system at 160 °C (CS160) and in an open system at 185 °C and 210 °C (OS185 and OS210). We measured the moisture content (initial and final) of wood, and the corrected mass loss (CML). The chemical analyses encompassed the contents of alpha-cellulose, hemicelluloses, lignin, and extractives (total, in acetone and dichloromethane). Wood color was measured before and after TM according to the CIEL*a*b* color space. It was possible to achieve the same color using different processes of thermal modification (CS160 and OS210). TM reduced wood lightness (L*), red-green chromaticity coordinate (a*), and yellow-blue chromaticity coordinate (b*). L* and a* had the bigger and lower variations, respectively. The color of thermally modified wood was significantly changed, even at the mildest condition tested (OS185, 0.33% CML).
Keywords
teak wood; closed system; open system; chemical analyses; CIELab
Subject
Chemistry and Materials Science, Materials Science and Technology
Copyright:
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
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