Artificial Weathering Effect on Surface of Heat-Treated Wood of Ayous (Triplochiton scleroxylon K. Shum)

Pelosi, Claudia; Agresti, Giorgia; Lanteri, Luca; Picchio, Rodolfo; Gennari, Emiliano; Monaco, Angela Lo

doi:10.3390/iecf2020-07975

Cited by 7 publications

(5 citation statements)

References 15 publications

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“…This does not disagree with the practical data known from works [5,12], the authors of which, by the way, also associate a decrease in the water absorption of wood with a change in the structural composition. But, unlike the results of studies reported in [6,21], the data obtained on the effect of thermal modification on the properties of wood, in particular, on water absorption, suggest the following:…”

Section: Discussion Of Results Of the Study Of Changes In The Propert...supporting

confidence: 73%

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Identifying parameters for wood protection against water absorption

Tsapko

Likhnyovskyi²,

Horbachova

et al. 2022

EEJET

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An issue related to using wood and timber for building structures is to ensure the stability and durability during operation within wide limits. Therefore, the object of research was the inhibition of the process of water absorption of pine and hornbeam wood during a thermal change in its structure. It is proved that in the process of thermal modification of wood, its structure changes, and, accordingly, water absorption. Namely, the maximum increase in mass under the action of water on an untreated sample of wood was more than 40 %, after thermal modification – less than 35 %. The increase in the mass of wood samples thermally modified and treated with a hydrophobic agent was less than 25 %. On the basis of the obtained results of physicochemical studies, discrepancies were found in the IR spectra of wood, both during thermal modification and with additional treatment with a hydrophobic agent, indicating structural changes in the components. In particular, the decrease or absence of the intensities of the absorption bands of some functional groups and the appearance or intensification of others. On the original hornbeam and pine thermogram, thermally modified, and thermally modified with the addition of a hydrophobic coating, thermogravimetric curves are similar to each other and are characterized by a loss of sample mass. This is possible with increasing temperature due to the processes of dehydration, destruction of hemicellulose, lignin, and cellulose with the formation of a non-combustible residue. During heat treatment of cellulose in the region of temperatures of 150÷450 °C, two processes take place in parallel. This is dehydration, accompanied by the destruction of the pyranose cycle and carbonization to form a carbon residue. Also, the process of destruction of glycosidic bonds while maintaining hydroxyl groups, accompanied by regrouping of pyranose cycles.

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Section: Discussion Of Results Of the Study Of Changes In The Propert...supporting

confidence: 73%

“…The purpose of study [5] is to assess the change in color and reflectivity of wooden surfaces due to artificial weathering. The tests were carried out using a solar box chamber that simulates external conditions and subsequent leaching with water.…”

Section: Literature Review and Problem Statementmentioning

confidence: 99%

Identifying parameters for wood protection against water absorption

Tsapko

Likhnyovskyi²,

Horbachova

et al. 2022

EEJET

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“…The color change a*, which tends to be close to 0, is due to cell degradation on the wood surface [18]. While changes in the color parameter b* tend to be caused by changes in the temperature around the wood [19].…”

Section: Resultsmentioning

confidence: 99%

Analysis of Red Meranti Wood Color Change Due to Weather Exposure in Samarinda

Erwin,

Fernandes,

Karyadi

et al. 2023

IOP Conf. Ser.: Earth Environ. Sci.

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Red Meranti is a high-quality commercial wood that can be used outdoors. Outdoor timber will be exposed to the weather so that, in the long period, it will cause discoloration. This study aims to determine the colour change of meranti wood due to weather exposure for five months. Observation of macroscopic and colorimeter changes in the colour of red meranti wood refers to the ASTM D2244 standard. The results showed that red meranti wood at the beginning of the study was brownish red with L* 64.67, a* 16.13, and b* 17.00. After 150 days, it turned greyish black with L* 50.74, a* 1.25, b* 3.41, and ΔE 24.50. Colour changes in L*, a*, and b* parameters for 150 days followed the estimated growth curve pattern.

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“…By observing the values of the chromatic coordinates and the total colour difference expressed by ∆E*, we can determine that, in the case of thermally untreated samples, the variations are higher in the uncoated samples than in the coated samples, and the spray application mode has the lowest colour variation. On the other hand, thermally treated samples exhibit a very different situation that reflects the variability in these samples [27]. The application of the polyurethane coating highly reduces the lightness of the samples (from about 39 to 20-23) and increase the values of a* and b*, especially in the case of spray application, as shown in Figure 3.…”

Section: Colour Datamentioning

confidence: 99%

“…Moreover, previous works showed that thermally treated samples exhibited great variations in colour and chemical properties because of artificial ageing [27]. For this reason, surface protection could also be necessary in the case of thermally treated Ayous wood, leading us to test the protective affect a new mono-component polyurethane coating, which we applied to both untreated and heat-treated samples.…”

Section: Introductionmentioning

confidence: 99%

Improving the Technical Characteristics of Untreated and Heat-Treated Ayous Wood against Accelerating Ageing by Testing Two Application Modalities of an Innovative Polyurethane Coating for Outdoor Uses

et al. 2023

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This paper presents the results of tests of a new mono-component polyurethane coating for wood with the aim of evaluating its effect on Ayous (Triplochiton scleroxylon K. Schum), which is a wood species used in Europe for various applications, especially outdoors, after being heat treated. The coating was tested on both untreated and thermally treated samples, as the latter procedure is commonly used in the wood industry to modify the material’s characteristics. Moreover, two kinds of coating application were tested: coatings applied via brushing and coatings applied via spraying; in this test, we also verified the most suitable and effective modality. Samples were investigated using the following techniques: colour measurement, roughness mapping, contact angle measurement, surface micro-hardness and the wearing test; these techniques were applied before and after a period of artificial ageing under simulated solar irradiation. Upon synthesizing the main results, we identified the following results: (i) the polyurethane coating reduced the colour variation as a result of artificial aging of the untreated Ayous wood; in contrast, heat-treated wood underwent large colour changes; (ii) the coating acted effectively as a hydrophobic agent on the surface of the wood in each case examined, though even a short aging time altered the initial wettability characteristics; and (iii) the application of the coating caused a decrease in the roughness of both untreated and heat-treated surfaces, though this trend was much more evident in the case of the spray modality of application; however, aging always induced an increase in roughness, which was mainly observed in uncoated wood samples.

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Artificial Weathering Effect on Surface of Heat-Treated Wood of Ayous (Triplochiton scleroxylon K. Shum)

Cited by 7 publications

References 15 publications

Identifying parameters for wood protection against water absorption

Identifying parameters for wood protection against water absorption

Analysis of Red Meranti Wood Color Change Due to Weather Exposure in Samarinda

Improving the Technical Characteristics of Untreated and Heat-Treated Ayous Wood against Accelerating Ageing by Testing Two Application Modalities of an Innovative Polyurethane Coating for Outdoor Uses

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