Decrease in Swelling Capacity of Pine Wood Modified with Aminoborates

[摘要] Upon direct contact of wood with water, a hydrophilic hydroxylated substrate actively absorbs water molecules due to the capillary-porous structure of the wood. Since water is characterized by high dielectric permittivity, sorption of water is usually accompanied by the swelling of the wood. It leads to the deterioration of the physical and the mechanical properties of the wood composite and, when the surface is covered with a film of paintwork materials while the wood is not subjected to an appropriate treatment, the pressure of the constrained swelling can cause destruction of the substrate. We have established in our work that the modification of the pine wood with the aqueous solutions of aminoborates leads to a decrease in the equilibrium degree of swelling, with 50 % modifier solutions being the most effective in this respect. In this study, the swelling rate of the substrate was found to be inversely proportional to the concentration of the modifier - with an increase of the concentration of the modifiers the swelling rate was markedly reduced due to the rate constants decrease. The results obtained allow us to speak of a decrease in swelling capacity of pine wood modified with aminoborates.

[发布机构] Department Engineering and Materials Science, Federal State Budget Educational Institution of Higher Education, Bryansk State Technical University, Boulevard 50 let Oktyabrya, 7, Bryansk; 241035, Russia^1;Department of Building Materials and Materials Science, Federal State Budget Educational Institution of Higher Education, Moscow State University of Civil Engineering (National Research University), Yaroslavskoye shosse, 26, Moscow; 129337, Russia^2

[关键词] Degree of swelling;Direct contact;High dielectrics;Hydroxylated substrates;Porous structures;Swelling capacities;Swelling rates;Wood composites