Abstract
This study was conducted to investigate the uptake of castor oil (CAO) in some wood specimens and the effect of CAO on the leaching ability, dimensional stability and fungal-decay resistance of the wood specimens. CAO was infused into the specimens using a pressure treatment. Uptakes of CAO penetrated in yellow poplar (YEP), Japanese cedar (JAC) and Douglas fir (DOF) blocks were higher than 100 %. The leaching ability of the CAO-based suspensions against saline water was the lowest in YEP, followed by Japanese larch (LAR), JAC and DOF. The retention values were 90 % or higher in most of the specimens. Radial and tangential swellings of CAO-treated strips submerged in saline water for 2 weeks were restrained compared to control specimens. No significant differences were found between bending strength and Janka hardness of CAO-treated and control strips. CAO treatment provided acceptable decay resistance to most wood specimens against Fomitopsis palustris and Trametes versicolor. Retention of CAO in the leached strips were identified through X-ray microscopic observation. Based on the results, CAO was determined to be an effective agent for improving the dimensional stability of wood. These results demonstrate the great potential of CAO as an environmentally friendly wood preservative and dimensional stabilizer, allowing CAO-permeated wood as raw materials for both indoor and outdoor use.
Funding source: R&D program of the Support for Creative Challenge Research Foundation funded by the National Research Foundation of Korea
Award Identifier / Grant number: NRF-2021R111A1A01050489
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Research ethics: The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.
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Author contributions: The authors have accepted responsibility for the entire contentof this manuscript and approved its submission.
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Competing interests: The authors state no conflict of interest.
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Research funding: R&D program of the Support for Creative Challenge Research Foundation funded by the National Research Foundation of Korea (Grant Number: NRF-2021R111A1A01050489).
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Data availability: The raw data can be obtained on request from the corresponding author.
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