THE EFFECT OF MASS LOSS ON MECHANIC PROPERTIES OF HEAT - TREATED PAULOWNIA WOOD

WOS: 000269071600010In this study, the effect of mass loss on mechanic properties of Paulownia (Paulownia elongata) wood was investigated. For this study, three different temperatures (160, 180, and 200 degrees C) and durations (3, 5, and 7 hours) were carried out. After heat treatment, the mass loss of the heat-treated samples were found and then it is determined how affected on mechanic properties of Paulownia wood The data obtained were analyzed using variance analysis, and then Tukey's test was used to determine the effect on mechanic properties of mass loss during heat treatment. The results show that mechanic properties were occurred decreasing in variation ration in relate with mass loss. While the maximum mass loss found was 9,78% at 200 degrees C and 7 hour, the compression strength, modulus of elasticity, bending strength and impact strength decreased about 17, 19, 78 and 88%, respectively. Hence, it is determined that the mass loss on mechanic properties of Paulownia wood significantly affected

Some Physical Properties of Heat-Treated Paulownia (Paulownia elongata) Wood

The aim of this study was to determine the changes in physical properties of Paulownia (Paulownia elongata) wood, a fast-growing species, during heat treatment at three different temperatures (160, 180, and 200C) and durations (3, 5, and 7h). After heat treatment, changes in swelling, density, color, and equilibrium moisture content at 35, 65, and 85\% RH were investigated. The results indicated that the minimum and maximum decrease swelling ratios were 6-46\% for tangential, 4-32\% for radial, and 12-64\% for longitudinal. The equilibrium moisture contents were 1-26\% for 35\% RH, 1-33\% for 65\% RH, and 1-38\% for 85 RH, respectively; the density of air-dried and oven-dried samples decreased by 1-16\% and 1.5-15\%, respectively, and color changes values (L{*}) were 10-40\%

The Effect of Nanoboron Nitride on Some Properties of Biopolymer Nanocomposites with Cellulose Nanofibrils and Nanoclays

The aim of this study was to investigate the effect of nanoboron nitride (BN) as nano-fire retardant on some properties of polylactic acid (PLA) and polyhydroxybutyrate (PHB) biopolymer nanocomposites reinforced with cellulose nanofibrils (CNFs) and nanoclays (NC). BN particles, as nano-fire retardant, were added to enhance the thermal stability of the obtained biopolymer nanocomposites. PLA and PUB nanocomposites were prepared with a twin screw extruder and characterized with mechanical tests, TGA, and DSC. Densities of the PI A and PUB nanocomposites were found to decrease with the addition of NBN loading. The mechanical properties of biopolymer nanocomposites decreased, except for tensile modulus. A ccording to TGA results. NBN loadings generally improved the thermal stability of the PLA and PUB nanocomposites. The degradation temperature for weight loss at 10 \%, 50 \% and 85 \% (T-10\% , T-50\% and T-55\%) increased with NBN loadings: the value of DTCmax was determined to improve with the loading of BN. DSC results showed that melt temperature (T-m ) and crystallization temperature (T-c) generally increased with BN loadings, whereas crystallinity (Xc) decreased with BN loadings in PLA nanocomposites

THE EFFECT OF TREATMENT TIME ON DIMENSIONALLY STABILITY, MOISTURE CONTENT AND MECHANICAL PROPERTIES OF HEAT TREATED ANATOLIAN CHESTNUT (CASTANEA SATIVA MILL.) WOOD

In this study, the effect of treatment time on dimensional stability, moisture content, and mechanical properties of heat-treated Anatolian chestnut (Castanea sativa Mill.) were investigated. Test specimens were subjected to a temperature of 180 degrees C at atmospheric pressure for five different treatment times (2, 4, 6, 8, and 12 hours). After the heat treatment of the specimens was completed, their moisture contents at relative humidity (RH) conditions of 45, 55, 65, 80, and 95\%, their dimensional stabilities, their mechanical properties, e.g., bending strength, modulus of elasticity, and compression strength, were determined. The data obtained were analyzed using variance analysis, and then the statistical analysis of Tukey's test was conducted. The results showed that heat treatment resulted in decreased (i.e., improved) moisture content, enhanced dimensional stability, and reductions of the mechanical properties. The decrease of mechanical properties that resulted from the 12-hour test was greater than the reductions observed for the tests that lasted 2, 4, 6, and 8 hours