Advanced Structures & Composites Center

Published: 2024

Publication Name: Universidad del Bio-Bio maderas: Ciencia Y Tecnologia

Publication URL: https://doi.org/10.22320/s0718221x/2024.23

Abstract:

In this study, different loading levels of cellulose nanofibril and borax were added as
reinforcement in melamine-urea-formaldehyde adhesive to enhance the performance properties
of plywood panels as engineered wood composites. Physical properties (density, thickness
swelling, water absorption, and moisture content), mechanical properties (modulus of rupture,
modulus of elasticity, and bonding strength), and formaldehyde content were tested using
relevant standards. The results showed that cellulose nanofibril and borax had a synergistic
effect, resulting in improved physico-mechanical properties. The best results were obtained by
combining 3 % cellulose nanofibril and borax. It was determined that the combination of
cellulose nanofibril and borax reinforcement resulted in a significant improvement of around
15 % in the thickness swelling, water absorption, and moisture content of plywood panels. The
combination of cellulose nanofibril and borax reinforcing resulted in a significant increase of
around 26 % in the modulus of rupture and modulus of elasticity of plywood panels, with a
bonding strength of around 47 %. The reinforcement technique did result in a 34 % decrease in
free formaldehyde content. As a consequence, cellulose nanofibril and borax can be used as
effective additives in the production of plywood panels to enhance their performance properties.