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2 2024

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Thermal Analysis of Oriental Beech Treated With Some Dimensional Stability Chemicals and Fire-Retardant Salts

Ergün Mehmet Emin, Toker Hilmi, Baysal Ergün, Altay Çağlar

Drewno : prace naukowe, doniesienia, komunikaty

2024

Vol. 67, nr 213

Art. no. 189913

In this study, Oriental beech (Fagus orientalis L.) wood was treated with 0.5%, 1.5% and 4.5% concentrations of two different dimensional stability chemicals (glyoxal and glycerol), two different fire-retardant salts (sodium acetate and sodium pentaborate), and their mixtures (1:1; weight/weight). The thermal degradation properties of wood samples treated with different types and concentrations of compounds were investigated using thermogravimetric analysis (TGA). When only glyoxal or glycerol was used, they had an adverse effect on the thermal properties of samples. The use of these chemicals together improved the thermal properties, due to the formation of longer polymer chains compared with the control group. Sodium acetate and sodium pentaborate salts, both singly and in a mixture, improved the char yield. The highest char yield (72.13%) was obtained using sodium pentaborate at 4.5% concentration.

Improving The Surface Quality of Wood After Weathering Through Heat Treatment Using Waste Olive Oil

Toker Hilmi, Kapçak Mehmet Ali, Altay Çağlar, Baysal Ergün, Özdemir Emir

Drewno : prace naukowe, doniesienia, komunikaty

2024

Vol. 67, nr 213

Art. no. 190878

Experiments were conducted with the aim of improving the surface properties of Oriental beech (Fagus orientalis Lipsky) wood after weathering, including colour, gloss, and roughness, by means of heat treatment with waste olive oil (WOHT). First, WOHT was applied at 200 ℃ and 230 ℃ for 2 and 4 hours. Then, for three months, Oriental beech specimens were exposed to the weather in the Muğla region (Southern Aegean, Türkiye). After weathering, colour, gloss, and roughness tests were performed according to the ASTM D1536-58T (1964), ASTM D 523-14 (2018), and DIN 4768 (1990) standards, respectively. All treatment groups except the control group were found to have positive ΔL* values after weathering. The values of total colour change (ΔE*) for WOHT Oriental beech were better than for the unheated (control) group. The best colour stability was obtained for WOHT Oriental beech heated at 200 ℃ for 4 hours. The glossiness of all specimens decreased after weathering, but the gloss results for WOHT Oriental beech were better than those obtained for the unheated (control) group. Lower temperatures and durations of heat treatment resulted in smaller decreases in the gloss of WOHT Oriental beech on weathering. The roughness of all specimens was increased by weathering, but lower roughness values after weathering were obtained for WOHT Oriental beech than for the control group.