Moisture absorption and dimensional stability of poplar wood impregnated with sucrose and sodium chloride

Abstract

This paper deals with the effect of vacuum-pressure impregnation of Poplar wood (Populus alba) by aqueous solutions of sucrose and sodium chloride on its physical properties. Groups of samples with different concentrations of substances in the aqueous solution were compared within each other and also with a reference (non-impregnated) group. The specimens from all groups were tested for density, moisture absorption and dimensional stability. The obtained data were statistically analysed and compared each other. The most satisfying final properties were achieved in impregnation of sucrose with concentration of 6,25 g/100 ml H 2 O. The retention was 31 kg m -3 (WPG around 8 %). The values of ASE (anti-swelling efficiency) reached to 36 % and MEE (moisture exclusion efficiency) was reduced by 33 %.

Dielectric and surface properties of wood modified with NaCl aqueous solutions and treated with FE-DBD atmospheric plasma

“…In this manner, common availability, low cost, simple preparation and application process of NaCl aqueous solution exhibit a good potential for further research. Depending on the concentration and properties of salt solution, it significantly influences the MC of wood in the upper hygroscopic region (relative humidity = above 75%), where it starts to absorb airborne water (Hertel 1997;Pařil and Dejmal 2014;Konopka et al 2018;Pouzet et al 2019). During modification of wood with NaCl, its solution penetrates in wood very well and NaCl can crystallize in wood after drying, while the adsorbed and free water present in wood works as a solvent for NaCl (Lesar et al 2009).…”

“…An increase in concentration of NaCl in aqueous solutions leads to the decrease in pH value and therefore higher availability of H + ions (Lima et al 2017). The density of the samples increases with an increasing concentration of NaCl, while such a modification has a positive effect on the dimensional stability of wood (Pařil and Dejmal 2014). The introduction of NaCl ions into wood increases its conductivity and dielectric constant (Sikder et al 2009).…”

Thermal Characterization of Pinus radiata Wood Vacuum-Impregnated with Octadecane

“…Pinus radiata wood comes from Yumbel city, Chile (72 • 36 57.42 longitude, 37 • 5 18.17 south latitude). The sample are made in slices of cylindrical shape, according to Chilean standard NCh631:2003 [22] ( Figure 1). The humidity content of the samples is 12%, corresponding to the dry wood condition.…”

Características higroscópicas de las maderas Spathodea campanulata, Fraxinus americana y Albizia plurijuga impregnadas con boro

“…En el mismo sentido, la disminución en la magnitud de la higroexpansión en la madera como efecto del tratamiento con sales de boro es interpretado por el bloqueo de los lúmenes celulares por cristales de boro y por la alteración de los componentes químicos presentes en la pared celular. Otros factores son la especie, el contenido de humedad y densidad de la madera en estudio (Hernández, 2007;Islam et al, 2012;Qian et al, 2019;Kocaefe et al, 2015;Sargent, 2019); la concentración, retención y clase de las sustancias de impregnación, (Temiz et al, 2008;Lesar et al, 2011;Qian et al, 2013;Petr y Aleš, 2014;González-Laredo et al, 2015;Giridhar et al, 2017;Qian et al, 2018;He et al, 2019); así como los tiempos, presiones y temperaturas aplicados en los procesos (Esteves y Pereira, 2009;Caldeira, 2010;Soltani et al, 2013;Gérardin, 2016;Fu et al, 2019). Como resultado, la biodiversidad de especies, reflejada en densidades y en estructuras anatómicas y en planos leñosos particulares a cada especie, árbol y tipo de tejido, así como las diferentes perspectivas experimentales, repercuten en una amplia variabilidad en los parámetros de higroscopía que caracterizan a una madera.…”