Chemical and structural changes of ocote pine (Pinus oocarpa) wood caused by thermal modification

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dc.creatorJhon F. Herrera-Builes
dc.creatorJairo A. Osorio
dc.creatorVíctor Sepulveda
dc.creatorRubén Ananias
dc.date2022
dc.date.accessioned2026-07-07T03:30:13Z
dc.descriptionThermal modifications alter the physical properties and improve the natural durability of wood without using chemical impregnation processes being an environmentally friendly alternative; these improvements could be made due to changes in the internal wood structure. In this investigation, changes caused to the chemical composition and microstructure of wood Pinus oocarpa by thermal modification at 170 and 190 °C were evaluated. The thermal treatment was carried out in a prototype chamber operated during the modification steps under a steam atmosphere, with a continuous flow without pressure. The evaluation of chemical changes was performed following the TAPPI standards. Using Fourier transform infrared spectroscopy (FTIR) and optical microscopy, the wood microstructure was characterized. The results showed a decrease in holocellulose contents by 7% at 170 °C and by 9% at 190 °C; lignin contents increased at 170 °C (6%) and at 190 °C (8%) and extractives were increased by 8% (170 °C) and 13% (190 °C); the changes obtained by the spectra were related to the C-H deformation in cellulose and hemicelluloses and the complex bonds of lignin carbohydrates of the -CH3 (lignin) and CH2 (carbohydrates) groups and organic acids released during thermal modification. Thickness of tracheid walls decreased in earlywood 8% (170 °C) and 22% (190 °C) and in latewood 11% (170 °C) and 14% (190 °C); lumen diameters increased in earlywood to 170 °C (14%) and 190 °C (48%) and in latewood in 14% (170 °C) an in 20% (190 °C). At 190 °C, the cell alterations were higher. Pinus oocarpa was thermally modified at 170 °C showing better wood quality in its internal structure.
dc.formatapplication/pdf
dc.identifier0304-2847
dc.identifierhttps://www.redalyc.org/articulo.oa?id=179975178013
dc.identifierhttps://www.redalyc.org/journal/1799/179975178013/
dc.identifierhttps://www.redalyc.org/journal/1799/179975178013/html/
dc.identifierhttps://www.redalyc.org/journal/1799/179975178013/179975178013.epub
dc.identifierhttps://www.redalyc.org/journal/1799/179975178013/movil
dc.identifier10.15446/rfnam.v75n2.97576
dc.identifier.urihttp://hdl.handle.net/123456789/435637
dc.languageen
dc.publisherUniversidad Nacional de Colombia
dc.relationhttp://www.redalyc.org/revista.oa?id=1799
dc.rightsRevista Facultad Nacional de Agronomía - Medellín
dc.sourceRevista Facultad Nacional de Agronomía - Medellín (Colombia) Num.2 Vol.75
dc.subjectAgrociencias
dc.titleChemical and structural changes of ocote pine (Pinus oocarpa) wood caused by thermal modification
dc.typeartículo científico

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Revista Facultad Nacional de Agronomía - Universidad Nacional de Colombia