Investigation of physical and mechanical performance of wood-based composites after laboratory accelerated aging

Document Type : Research Paper

Authors

1 M.Sc. graduated student, Department of wood industry, Faculty of materials engineering and new technologies, Shahid Rajaee teacher training university, Tehran, Iran

2 Assistant Prof., Department of wood industry, Faculty of materials engineering and new technologies, Shahid Rajaee teacher training university, Tehran, Iran

Abstract

Abstract
The aim of current study is to determine the physical and mechanical properties of wood-based composites commonly used in Iran’s market before and after accelerated aging. Accelerated aging process performed based on ASTM D1037. Specimens of particleboard and medium-density fiberboard (MDF) made of wood and bagasse obtained from various factories. Physical properties including density, water uptake and thickness swelling (after long-term water soaking), and mechanical properties including flexural strength, modulus of elasticity and internal bonding before and after aging. The most density loss observed in MDF after aging, while particleboard specimens were less damaged. Water absorption and thickness swelling of MDF specimens were less than those of particleboards during long immersion, due to the smoother surface and lower permeability. After aging, water uptake and swelling increased in all boards due to hydrolysis of resin and bulking the boards. After aging process, highest reduction in flexural strength and modulus of elasticity observed in MDF although a significant reduction observed in particleboard. Internal bonding of specimens were higher than standard level before aging process; but after aging decreased significantly, due to hydrolysis of resin in alternating drying-wetting conditions.

Keywords

References

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Iranian Journal of Wood and Paper Industries
Volume 9, Issue 1
June 2018
Pages 103-117

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