Journal of the Korean Wood Science and Technology

The Korean Society of Wood Science & Technology (한국목재공학회)
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Resistance of Polystyrene-Impregnated Glued Laminated Lumbers after Exposure to Subterranean Termites in a Field

  • Dede HERMAWAN (IPB University (Bogor Agricultural University), Kampus IPB Darmaga) ;
  • Mahdi MUBAROK (IPB University (Bogor Agricultural University), Kampus IPB Darmaga) ;
  • Imam Busyra ABDILLAH (IPB University (Bogor Agricultural University), Kampus IPB Darmaga) ;
  • Yusuf Sudo HADI (IPB University (Bogor Agricultural University), Kampus IPB Darmaga) ;
  • Cossey YOSI (The Papua New Guinea University of Technology) ;
  • Aujchariya CHOTIKHUN (Faculty of Science and Industrial Technology, Prince of Songkla University) ;
  • Rohmah PARI (Research Center for Biomass and Bioproducts, National Research and Innovation Agency (BRIN)) ;
  • Gustan PARI (Research Center for Biomass and Bioproducts, National Research and Innovation Agency (BRIN))
  • Received : 2023.10.25
  • Accepted : 2023.12.15
  • Published : 2024.01.25
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Abstract

Termites are a serious threat to wood-based products in Indonesia. This study investigated the termite resistant property of glulam made from polystyrene-modified wood. Three tropical fast-growing wood species, namely mangium (Acacia mangium), manii (Maesopsis eminii), and rubberwood (Hevea brasiliensis), were prepared for flat-sawn laminae. After getting air-dried condition, the laminae were impregnated with polystyrene using potassium peroxydisulphate as a catalyst followed by polymerization at 80℃. Polystyrene-impregnated and control glued-laminated lumbers (glulams) were manufactured, and solid wood was provided. Three wood species and three wood products with six replicates were exposed in a field in Bogor, Indonesia, for four months, and before the tests, their density and moisture content were measured. At the end of the field tests, the weight loss and protection levels of each test sample were determined. A completely randomized factorial design was used for data analysis. The weight percentage gains for mangium, manii, and rubberwood were 22.30%, 18.22%, and 10.44%, respectively. The results showed that manii belonged to low-density wood, whereas the other two woods were medium-density wood, and the moisture content was the ambient moisture content, typical of the Bogor area. Regarding weight loss and protection level, mangium was the most durable against subterranean termite attacks, followed by rubberwood and manii. Among the wood products, the polystyrene-impregnated glulam presented the highest durability, followed by the control glulam and solid wood. Therefore, mangium and rubberwood polystyrene-impregnated glulams are recommended for future product development.

Keywords

Acknowledgement

The authors would like to express their appreciation to the Indonesian Ministry of Education, Culture, Research and Technology, National Research and Innovation Agency, and the Department of Research Strengthening and Development, which sponsored the research grant via the National Competitive Basic Research Scheme, No. 001/E5/PG.02.00. PL/2023. The authors also thank the IPB University (Bogor Agricultural University) for facilitating this research funding through research contract no. 15895/IT3. D10/PT01.02/P/T/2023, and the Research Center for Biomass and Bioproducts (National Research and Innovation Agency (BRIN), all in Bogor, Indonesia) for the use of their research facilities.

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