Effect of oil heat treatment on weathering resistance of poplar wood

Document Type : Research Paper

Authors

Department of Wood and Paper Sciences and Technology, Faculty of Natural Resources, University of Tehran, Karaj, Iran.

10.22059/jfwp.2024.371195.1279

Abstract

Different methods have been developed for the heat treatment of wood. Oil heat treatment (OHT), as a unique method, can provide a dry and oxygen-free heating medium. This study used a pilot-scale oil heat treatment to treat poplar wood at different temperatures to enhance its weathering resistance. Poplar timber was subjected to oil heat treatment using a specific heating program at three target temperatures (180, 190, and 200 °C), each held for two hours. The specimens were prepared and subjected to 1000 hours of accelerated weathering with a Gardner wheel. Water absorption and volumetric swelling were also determined during seven days of soaking in water. Contact angle measurements of water droplets, colorimetry, and ATR-FTIR analysis were also conducted before and after weathering. The dimensional stability of treated wood increased with higher processing temperature. Although the water absorption values of treated wood were lower than those of the control specimens, the difference was not significant. The samples exhibited an obvious color difference before weathering due to oil heat treatment, but their color changed to silver-gray tans after weathering. The maximum ∆E value after weathering was observed in the samples treated at 200 °C. Weathering increased the wettability of wood surfaces, but the treated samples still had a higher water droplet contact angle than those of the control sample. ATR-FTIR results determined that oil heat treatment is not an effective method for preventing the degradation of lignin in wood surface exposed to weathering factors.

Keywords

Main Subjects

References

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Forest and Wood Products
Volume 77, Issue 1
June 2024
Pages 55-71

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