Effects of High-Temperature Heat Treatment Modification by Impregnation on Physical and Mechanical Properties of Poplar

Abstract

To expand the application range of fast-growing poplar, a modification method of poplar impregnated with nano-SiO2 and urea-formaldehyde resin was proposed in this study. Taking the mass ratio of nano-SiO2 mass to the solid content of urea-formaldehyde resin impregnation solution (W), high-temperature (H), and high-temperature time (T) as influencing factors, the effects of impregnation high-temperature heat treatment modification on the physical and mechanical properties of fast-growing poplar were explored. At the same time, the weight loss rate, oven-dry density, dry shrinkage properties, swelling properties, modulus of rupture (MOR), and modulus of elasticity (MOE) of the modified poplar were measured. The research results show that both the weight loss rate and the coefficient of variation of the oven-dry density have a high correlation with the temperature; the high-temperature immersion heat treatment can reduce the dry shrinkage and swelling of poplar, improve the dimensional stability, MOR, and MOE. W is 0–1%, H is 160 °C, and T is 2–4 h. The impregnated heat-treated wood has good MOR and MOE. Therefore, the combination of nano-SiO2 and urea-formaldehyde resin impregnation and heat treatment to modify poplar can improve some physical and mechanical properties of fast-growing poplar, expand the use of poplar, increase its added value, and realize high-value utilization.

Study on Modification of Poplar Wood via Composite Impregnation with Silica Sol/Melamine–Glyoxal Resin

“…Poplar from Jiaohe Forestry, Jilin Province, was used in this study with a density of about 0.42 g/cm 3 . The utilized samples were defect-free, devoid of cracks or knots.…”

“…Fast-growing poplar wood presents challenges such as low density, low strength, easy deformation and cracking, flammability, and perishability, which limit its potential applications and utilization. In order to improve the performance of fast-growing poplar wood and extend its service life, modified treatment is needed [3].…”

Prototipo secador de madera para procesamiento secundario con tecnología de efecto invernadero, colectores solares de aire y sistemas de control electrónico

“…Nos basamos en propuestas como la de Xue et al (2022), quienes mejoraron la estabilidad dimensional y reducen las propiedades de contracción en seco de la madera. También en Chi et al (2022), quienes evaluaron los efectos del secado solar asistido por aire en los procesos de secado de madera de álamo en regiones de zonas subfrígidas.…”

“…La madera es un material polimérico renovable, que se usa ampliamente en la construcción, muebles y decoración de interiores debido a sus excelentes propiedades, como la alta relación resistencia-peso y la protección del medio ambiente (Xue et al, 2022). En Perú, la industria maderera la conforman 111 000 empresas de las que 98% son micro-empresas, siendo la segunda industria de importancia después de la textil por el número de empresas (Dourojeanni et al, 2021).…”

Effect of NaOH Pretreatment on Permeability and Surface Properties of Three Wood Species

“…Poplar, a common fast-growing broad-leaf wood, is mostly dark yellow and has a loose fiber structure, limiting its use. Researchers have conducted many modification treatments to expand the range of applications for poplar. − Wood pretreatment is a necessary step before various modification treatments of wood, aiming to improve the permeability of wood and reduce the resistance of wood’s anisotropy to the penetration and diffusion of modifying agents. However, there is currently limited research on the pretreatment of cedar, white oak, and poplar with NaOH, especially regarding the effects of NaOH on the quality changes and surface properties of these three types of wood.…”