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Title
Durability-related performance of reinforced bondline by phenol formaldehyde/nano SiO2 composite in Laminated Veneer Lumber (LVL)
Type Article
Keywords
Not Record
Abstract
The development of bonding performance and cohesion of the constituent members is of great interest in the wood-based composites production process. This work presents an investigation for assessment of bondline in reinforced laminated veneer lumber. Phenol-formaldehyde was modified with silicon dioxide nanoparticles (SiO2-NPs), before applying as the binder. Experimentally, the bonding quality and durability were investigated based on penetration parameters, shear strength, apparent cohesive wood failure, and delamination ratio. Results verified that SiO2-NPs had catalytic impacts on the polymerization mechanism of phenol-formaldehyde resin. Bondline morphology was affected by SiO2-NPs presence, in a way that the penetration parameters were reduced under the influence of the viscosity rising and polymerization behavior of phenol-formaldehyde/nano SiO2 composite. With the shorter hot-pressing time, the brittle resin failed cohesively in the bondline, while the reinforced bondline by phenol-formaldehyde/nano SiO2 composite failed by delamination in the wood fibers. The highest shear strength in the core layer was recorded when 2% SiO2-NPs were presented in the bondline. The optimum shear strength and delamination ratio were observed at ≈ 135 and 330 μm penetration depth for effective penetration and maximum penetration, respectively. The SiO2-NPs promoted the bonding durability performance of the bondline, especially in the core layer of the laminated veneer lumbers with shortened hot-pressing time. This reinforced product indicated applicability of being used as a building material in high humid/exterior conditions.
Researchers Mohammad Farajollah Pour (First researcher) , Hamidreza Edalat (Second researcher) , Ali Dorieh (Third researcher) , Mohammad Valizadeh Kiamahalleh (Fourth researcher) , Mohammad Hassan Shahavi (Fifth researcher)