Alteração da cor da madeira de teca por tratamento térmico

Lopes, Juliana de Oliveira; Garcia, R. Á.; Latorraca, João Vicente de Figueiredo; Nascimento, Alexandre Miguel do

doi:10.1590/2179-8087.013612

Cited by 9 publications

(5 citation statements)

References 15 publications

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“…Based on color classification reported by Camargos & Gonçalez (2001), wood from sapwood is white-gray and from heartwood in brown-olive, for all ages. The same color pattern was obtained for teak sapwood (Lopes et al, 2014) and heartwood (Queiroz et al, 2016) in other studies.…”

Section: Colorimetrysupporting

confidence: 86%

Influence of Age on the Discrimination of Tectona grandis by VIS/NIR Spectroscopy

et al. 2019

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Wood color and properties are variables among and within species, and fast and non-destructive techniques can be applied to their characterization, being also important in wood marketing and quality control. This paper evaluated the influence of age on the discrimination of Tectona grandis L.F. (teak) wood by VIS/NIR spectroscopy. Wood from three ages, with heartwood and sapwood, were studied, totaling 36 samples per age. Quantitative colorimetric data, based on CIELAB 1976, visible and NIR infrared spectra were collected from radial and tangential surfaces in five positions of each sample, in a total of 540 spectra. Both techniques were adequate for age discrimination in teak wood. Statistical differences were observed in the chromatic coordinates in heartwood and sapwood for each age. VIS/NIR spectroscopy can be applied for age discrimination based on teak solid samples and for wood quality control.

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Section: Colorimetrysupporting

confidence: 86%

Influence of Age on the Discrimination of Tectona grandis by VIS/NIR Spectroscopy

et al. 2019

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“…Figure 2b also shows the colour coordinates (a*b*) of several commercial woods [56,57]. Poly(butylene succinate)/ASF/MLO composites with 10 wt % show similar colour coordinates to those of eucalypt [58] and teak woods [59]. As the ASF content increases, the yellow content decreases and the obtained materials are browner.…”

Section: Resultsmentioning

confidence: 99%

The Effect of Varying Almond Shell Flour (ASF) Loading in Composites with Poly(Butylene Succinate (PBS) Matrix Compatibilized with Maleinized Linseed Oil (MLO)

et al. 2018

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In this work poly(butylene succinate) (PBS) composites with varying loads of almond shell flour (ASF) in the 10–50 wt % were manufactured by extrusion and subsequent injection molding thus showing the feasibility of these combined manufacturing processes for composites up to 50 wt % ASF. A vegetable oil-derived compatibilizer, maleinized linseed oil (MLO), was used in PBS/ASF composites with a constant ASF to MLO (wt/wt) ratio of 10.0:1.5. Mechanical properties of PBS/ASF/MLO composites were obtained by standard tensile, hardness, and impact tests. The morphology of these composites was studied by field emission scanning electron microscopy—FESEM) and the main thermal properties were obtained by differential scanning calorimetry (DSC), dynamical mechanical-thermal analysis (DMTA), thermomechanical analysis (TMA), and thermogravimetry (TGA). As the ASF loading increased, a decrease in maximum tensile strength could be detected due to the presence of ASF filler and a plasticization effect provided by MLO which also provided a compatibilization effect due to the interaction of succinic anhydride polar groups contained in MLO with hydroxyl groups in both PBS (hydroxyl terminal groups) and ASF (hydroxyl groups in cellulose). FESEM study reveals a positive contribution of MLO to embed ASF particles into the PBS matrix, thus leading to balanced mechanical properties. Varying ASF loading on PBS composites represents an environmentally-friendly solution to broaden PBS uses at the industrial level while the use of MLO contributes to overcome or minimize the lack of interaction between the hydrophobic PBS matrix and the highly hydrophilic ASF filler.

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“…Studies conducted by Arruda et al (2015), Lopes et al (2014), Santos et al (2014), Figueroa et al (2015), Carrasco et al (2016), and Pertuzzatti et al (2018) aimed to study the effect of thermal treatments on the mechanical Engenharia Agrícola, Jaboticabal, v.39, n.3, p.365-369, may/jun. 2019…”

Section: Introductionmentioning

confidence: 99%

Influence of Exposure Time to Operating Temperature on Shear Strength of Wood Used in Roof Structures

Christofóro

Almeida

et al. 2019

Eng. Agríc.

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Wood is one of the main materials used in the constructing of covering structures (roofs) because of its versatility. Under this situation, due to solar radiation incidence, the temperature can exceed 60 °C and, such as other environmental conditions, influence the mechanical properties of the wood in use. The aim of this research was to study the influence of exposure time of the wood of four different hardwood species at a temperature of 60 °C on the shear strength parallel to fibers. The wood of the following species was used: Cupiúba (Goupia glabra), Eucalyptus (Eucalyptus saligna), Garapeira (Apuleia leiocarpa), and Jatobá Tamarindo (Hymenaea sp.). In order to investigate the effect of exposure time (0, 168, 456, 720, and 2160 hours) of the wood species in an oven (60 °C) on the values of shear strength in the direction parallel to fibers, an analysis of variance (ANOVA) was carried out at 5% significance level. According to the results, the time the wood was exposed to the operating temperature significantly influenced the shear strength in the direction parallel to fibers. In addition, all species showed a decrease in shear strength after 456 hours of exposure at a constant temperature of 60 °C.

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Alteração da cor da madeira de teca por tratamento térmico

Cited by 9 publications

References 15 publications

Influence of Age on the Discrimination of Tectona grandis by VIS/NIR Spectroscopy

Influence of Age on the Discrimination of Tectona grandis by VIS/NIR Spectroscopy

The Effect of Varying Almond Shell Flour (ASF) Loading in Composites with Poly(Butylene Succinate (PBS) Matrix Compatibilized with Maleinized Linseed Oil (MLO)

Influence of Exposure Time to Operating Temperature on Shear Strength of Wood Used in Roof Structures

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