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An experimental study on pore structural changes of ultrasonic treated Korean paulownia (Paulownia coreana)

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Abstract

This study investigated the effects of ultrasonic treatment on the pore structure of the Korean paulownia (Paulownia coreana). Cylindrical samples (10 mm thickness and 29 mm in diameter) were taken from heartwood in longitudinal direction and divided into two groups; Group (A) consisted of samples with 2 to 3 annual rings, while the samples of Group (B) had 5 to 6 annual rings. Changes in pore structure, gas permeability, and sound absorption were measured after ultrasonic treatment for between 30 and 90 min. This study confirmed that open-pore porosity significantly increased as a result of ultrasonic treatment. However, gas permeability increased only within the first 30 min of ultrasonic treatment, but then did not increase proportionally with increasing treatment time. This study determined that during the early stage of ultrasonic treatment the number of through pores increased, but as treatment time was extended the number of blind pores increased but not the number of through pores. The sound absorption coefficient increased after ultrasonic treatment, but similar to gas permeability, only up to a certain point, beyond which increased treatment time did not result in further improvements. In addition, paulownia’s tyloses were broken by ultrasound treatment, which was responsible for the increase in blind-pore porosity.

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Acknowledgements

This research was supported by the Basic Science Research Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Education (NRF-2019R1I1A3A02059471) and was supported under the framework of an international cooperation program managed by the NRF of Korea (NRF-2020K2A9A2A08000181). Authors are also thankful to the ‘‘The Business Startup Incubator Support Program’’ supported by the Ministry of Education and National Research Foundation of Korea.

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Authors and Affiliations

  1. Department of Housing Environmental Design, and Research Institute of Human Ecology, College of Human Ecology, Jeonbuk National University, Jeonju, 54896, South Korea

    Eun-Suk Jang & Chun-Won Kang

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  1. Eun-Suk Jang
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  2. Chun-Won Kang
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Contributions

Eun-Suk Jang: First author, Conceptualization, Methodology, Experiment, Formal analysis, Writing (original draft), Writing (review & editing). Chun-Won Kang: Corresponding author, Supervision, Writing (review & editing).

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Correspondence to Chun-Won Kang.

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Jang, ES., Kang, CW. An experimental study on pore structural changes of ultrasonic treated Korean paulownia (Paulownia coreana). Wood Sci Technol 56, 883–898 (2022). https://doi.org/10.1007/s00226-022-01382-1

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  • DOI: https://doi.org/10.1007/s00226-022-01382-1