Mechanical, morphological and thermal properties of nano-boron nitride treated wood materials

Abstract

Thermal instability is the one of the most important disadvantages of wood since it begins to decompose at a low temperature (˃110 °C). Many scientists, past and present, have conducted studies aimed at improving the thermal stability of wood. The aim of this study was to impregnate wood with nano-sized boron nitride (NBN) to improve its thermal stability and to investigate the changes in the properties of Scots pine (Pinus sylvestrist), Ash (Fraxinus exelsior), and Iroco (Chlorophora excelsa) woods after the impregnation. The effects of the impregnation with NBN also were investigated on the heat-treated woods. The impregnation was conducted with using full-cell method in a chamber under a pressure of 0.6 MPa for 1 h. Densities at 0% and 12% moisture content (MC), mechanical properties, color changes, thermal stability, and scanning electron microscopy (SEM/EDAX) analysis were determined. The test results showed that the impregnation of wood with NBN increased generally the flexural strength and elasticity of modulus at bending, but the NBN impregnation decreased generally the compression strength except for ACI, ATWI, IC, and ICI. It was also determined that the changes in density and color were statistically different after the impregnation. According to the SEM/EDAX results, deposits of nano-sized boron nitride were found inside the cell wall and on the pits. But the deposits were also determined in inside structure of the wood with EDAX analysis. Thermal stability in T 10% and T 50% of wood was found to improve after the impregnation with NBN. TG/DTG and DTA values for some samples were found to fluctuate due to the heterogeneous dispersion of the NBN in the wood.

Physical, mechanical and thermal properties of wood/zeolite/plastic hybrid composites

“…There is a lot of studies on the effects of filler such as WF, wheat straw, nanoclays and carbon nanotube on the physical, mechanical and thermal performance of WPCs. (Khonsari et al 2015, Samariha et al 2015, Aydemir et al 2016, Valles-Rosales et al 2016a, Nafchi et al 2015. But, currently there is little information available concerning on effect of zeolites mining on mechanical, physical, and thermal properties of WPCs.…”

Formulating environmentally benign wood preservatives based on chicken feather protein combined with copper and boron salts

“…By contrast, the residual char values of samples treated by P 2 and P 3 signi cantly surpassed that of control samples and P 1 group, due to the more active components Cu and B. It can also be seen from the TGA curves that the initial precarbonization temperatures of three treated samples were obviously lower than that of control samples, as a consequence of the introduction of Cu and B elements, which could promote char forming during the heating process (Helsen et al 1999;Aydemir et al 2016). Additionally, the eventual carbon residues of treated samples were all higher than that of control samples, indicating the function of CFP-WP on the treated wood samples, and further con rming the penetration and xation of CFP-WP onto wood structures.…”

Flammability of a softwood impregnated with alumina nanoparticles

“…On the other hand, pine woods have low natural durability and low mechanical performance, especially those woods planted in tropical countries, like Brazil (Acosta et al 2020b). These woods are susceptible to be degraded by both biotic (including fungi, insects, and termites) and abiotic (like ultraviolet radiation, rain, and humidity) agents, which restrict their useful life (Aydemir et al 2016).…”

“…The impregnation of inorganic particles seems to be a promising alternative in order to improve technological properties of several organic materials, including wood (Aydemir et al 2016). Aluminum oxide particles (Al 2 O 3 ), also called alumina particles, were already used as flame retardants in some applications, but their effect, when impregnated in solid woods, was not elucidated yet.…”