Chemical and Mechanical Properties Changes in Corymbia Citriodora Wood Submitted to Heat Treatment

Silva, Marcio Rogério da; Brito, José Ótávio; Govone, José Sílvio; Machado, Gilmara de Oliveira; Calil, Carlito; Christofóro, André Luis; Lahr, Francisco Antônio Rocco

doi:10.5923/j.ijme.20150504.04

Cited by 13 publications

(13 citation statements)

References 17 publications

(31 reference statements)

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“…In the experiment, a loss of major wood compounds takes place mainly above 200 °C. The thermal degradation starts by decomposition of hemicelluloses, that generally show a lower thermal stability than cellulose (Tumen et al 2010;Silva et al 2015). The decrease in extractives content by heat treatment up to 200 °C could be due to the removal of volatiles.…”

Section: Chemical Changesmentioning

confidence: 99%

The Effect of Chemical Changes during Heat Treatment on the Color and Mechanical Properties of Fir Wood

et al. 2016

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European silver fir (Abies alba L.) wood was heat-treated in an oven for 60 min at seven different temperatures of 100 °C, 150 °C, 200 °C, 220 °C, 240 °C, 260 °C, and 280 °C under atmospheric pressure in the presence of air. The effect of thermal treatment on the chemical composition, mechanical, and color properties of the wood was studied, and the mutual correlations between the investigated properties were evaluated. The bending strength/modulus of rupture (MOR) and the modulus of elasticity (MOE) were positively correlated with the total saccharides, glucose, mannose, and xylose content, where R ranged from 0.942 to 0.984. For changes in the wood color, very strong positive correlations between the total color difference and the contents of lignin and extractives were determined, where R = 0.968 and 0.945 respectively. Additionally, the total color difference was negatively correlated with the total saccharides, mannose, and xylose content, where R ranged from 0.876 to 0.938. The obtained data were evaluated by principal component analysis (PCA), where the components explained 93.1% of the total variance.

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Section: Chemical Changesmentioning

confidence: 99%

The Effect of Chemical Changes during Heat Treatment on the Color and Mechanical Properties of Fir Wood

et al. 2016

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“…According to Silva et al (2015), under treatment temperatures, volatile extractives were either evaporated or modified. However, there were no significant changes in the cell wall constituents and this might have facilitated the fungal attack.…”

Section: Resultsmentioning

confidence: 99%

“…Seven planks, with dimensions of 6 cm × 16 cm × 56 cm (thickness × width × length) were used for each temperature. The thermal modification process is explained in Paes et al (2015Paes et al ( , 2016 and Silva et al (2013Silva et al ( , 2015.…”

Section: Methodsmentioning

confidence: 99%

“…Alternative technologies are able to change the chemical structure of wood and improve its biological resistance (Klüppel et al 2015, Treu & Larnøy 2016. Thermal modification has provided improved decay resistance, dimensional stability, weathering resistance, reduced water absorption, material darkening and colour stability (Silva et al 2015, Sivrikaya et al 2015, Pratiwi et al 2019) in many species of wood.…”

Section: Introductionmentioning

confidence: 99%

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Effect of Thermal Modification on Decay Resistance of Corymbia Citriodora and Pinus Taeda Wood

Paes¹,

Brocco²,

Loiola³

et al. 2021

JTFS

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Alternative and eco-friendly technologies such as thermal modification can improve durability and dimensional stability of wood. This study evaluated the effect of thermal modification on resistance improvement of Corymbia citriodora and Pinus taeda wood against brown and white-rot fungi under laboratory conditions. Wood samples were subjected to treatment temperatures of 160, 180, 200, 220 and 240 °C in a laboratory electric furnace, under dynamic nitrogen atmosphere. A treatment temperature of 260 °C was additionally used for P. taeda. Seven planks, with dimensions of 6 cm × 16 cm × 56 cm (thickness × width × length), were used for each temperature. The thermally modified planks were transformed into prismatic test samples with dimensions of 1.9 cm × 1.9 cm × 1.9 cm. Inoculated culture bottles containing test blocks were kept in an incubation room for 12 weeks. Thermal modification temperatures at 160 and 180 °C decreased the biological resistance of C. citriodora wood. Treatment temperatures of 200, 220 and 240 °C showed satisfactory decay resistance gains for both species. Rhodonia placenta was the most degrading fungus at temperatures lower than 200 °C.

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“…Therefore, heat-treated wood has a higher percentage share of lignin than normal wood (Vukas et al 2010). Hemicelluloses are more affected than other constituents of wood due to their relatively lower thermal stabilities (da Silva et al 2015). Changes in hemicellulose determine the strength properties of woods heated at high temperatures (Hills 1984).…”

Section: Mor Of Impregnated and Heat-treated Oriental Beech Woodmentioning

confidence: 99%

Mechanical Properties of Impregnated and Heat Treated Oriental Beech Wood

et al. 2016

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The main purpose of this study was to investigate mechanical properties such as the modulus of rupture (MOR) and compression strength parallel to grain (CSPG) of impregnated and heat-treated Oriental beech (Fagus orientalis L.) wood. Some copper and boron containing impregnation chemicals such as Wolmanit CX-8 (WCX-8) and Celcure AC-500 (CAC-500) were used. Wood specimens were impregnated 2% aqueous solution of the chemicals according to ASTM D1413-07e1 standard. The wood specimens were heated at 150 and 175 °C for 4 and 8 h, respectively. Results showed that both impregnation and heat treatment decreased the MOR and CSPG of Oriental beech wood. The MOR losses of Oriental beech after both treatments were higher than CSPG losses. The largest reduction of MOR and CSPG were observed with 51.5% and 15.5% for CAC-500 impregnated and heated at 175 °C for 8 h. Except for WCX-8 impregnation and heat treatment at 150 °C for 4 and 8 h, the MOR values of impregnated and heat-treated Oriental beech wood were lower than only heat-treated Oriental beech wood. It was also found that the CSPG values of impregnated and heat-treated Oriental beech wood were higher than only heat-treated Oriental beech wood, except for impregnation and heat treatment at 175 °C for 8 h.

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Chemical and Mechanical Properties Changes in Corymbia Citriodora Wood Submitted to Heat Treatment

Cited by 13 publications

References 17 publications

The Effect of Chemical Changes during Heat Treatment on the Color and Mechanical Properties of Fir Wood

The Effect of Chemical Changes during Heat Treatment on the Color and Mechanical Properties of Fir Wood

Effect of Thermal Modification on Decay Resistance of Corymbia Citriodora and Pinus Taeda Wood

Mechanical Properties of Impregnated and Heat Treated Oriental Beech Wood

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