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    EFFECT OF SIO2 AND AL(2)O(3) NANOPARTICLES TREATMENT ON THERMAL BEHAVIOR OF ORIENTAL BEECH WOOD
    (SLOVAK FOREST PRODUCTS RESEARCH INST, 2018) Deveci, Ilyas; Sacli, Cevdet; Turkoglu, Turkay; Baysal, Ergun; Toker, Hilmi; Peker, Huseyin
    In this study, investigation of the thermal properties of Oriental beech (Fagus orientalis L. ) wood samples treated with 1.50 and 3.00% aqueous solutions of SiO2 and Al2O3 nanopartides were performed by using thermogravimetric analysis (TGA), differential-thermogravimetric (DTG), and differential-thermal analysis (DTA) under argon atmosphere. Thermal degradation of SiO2 and Al2O3 nanoparticles treated Oriental beech wood could be separated in three district regions. These regions could be called as drying, pyrolysis, and charring. Our results showed that Al2O3 and SiO2 nanoparticle treatment increased residual char yield of Oriental beech wood samples. The highest residual char yield was obtained for wood samples treated with 3.00% Al2O3 nanoparticles. Moreover, higher concentration levels resulted in lower T-max values, higher T-i values and higher char yield of Oriental beech wood.
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    Mechanical Properties of Impregnated and Heat Treated Oriental Beech Wood
    (NORTH CAROLINA STATE UNIV DEPT WOOD & PAPER SCI, 2016) Turkoglu, Turkay; Baysal, Ergun; Yuksel, Mehmet; Peker, Huseyin; Sacli, Cevdet; Kureli, Ihsan; Toker, Hilmi
    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 degrees 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 degrees C for 8 h. Except for WCX-8 impregnation and heat treatment at 150 degrees 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 degrees C for 8 h.
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    SURFACE CHARACTERISTICS OF SCOTS PINE TREATED WITH CHEMICALS CONTAINING SOME COPPER COMPOUNDS AFTER WEATHERING
    (SLOVAK FOREST PRODUCTS RESEARCH INST, 2016) Ustun, Suleyman; Baysal, Ergun; Turkoglu, Turkay; Toker, Hilmi; Sacli, Cevdet; Peker, Huseyin
    In this study, it was aimed to investigate surface hardness, gloss, and color changes of Scots pine treated with chemicals containing some copper compounds after six months weathering. Adolit KD-5 (AD KD-5), celcure AC-500 (CAC-500), and wolmanit CX-8 (WCX-8) were used as impregnation chemicals containing copper compounds. Scots pine wood specimens were treated with 2 % aqueous solution of chemicals according to ASTM D1413-07e1 (2007) standard. Results showed that while surface hardness and gloss values of untreated Scots pine wood specimens were decreased after weathering, they increased treated Scots pine wood specimens after weathering. The decrease in L* of untreated and treated wood indicates that the specimens became darker after weathering. While weathering caused less green and less yellow for untreated control specimen, it caused less red and less yellow for treated wood. Treated Scots pine wood specimens showed better color stability compared to untreated Scots pine after weathering. In terms of surface hardness, gloss, and color stability values CAC-500 treated Scots pine gave the best results after weathering.
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    THERMAL CHARACTERISTICS OF ORIENTAL BEECH WOOD TREATED WITH SOME LEACHING RESISTANT BORATES
    (SLOVAK FOREST PRODUCTS RESEARCH INST, 2017) Deveci, Ilyas; Baysal, Ergun; Toker, Hilmi; Yuksel, Mehmet; Turkoglu, Turkay; Peker, Huseyin
    It was aimed to investigate thermogravimetric analysis (TGA), differential-thermogravimetric (DTG), and differential-thermal analysis (DTA) of Oriental beech (Fagus orientalis L.) wood treated with some leaching resistant borates such as sodium tetraphenylborate (STPB) and phenylboronic acid (PBA). In this study; 0.25, 1.00, and 4.70 % aqueous solutions of borates were prepared. Results of the study indicated that pyrolysis occurred in three stages for STPB and PBA treated Oriental beech wood. Generally, while concentrations of the STPB and PBA increased, Ti and Tmax values of STPB and PBA treated wood specimens decreased. Residual char contents of STPB and PBA treated wood specimens for all concentrations were higher than untreated control specimen.