THE PHYSICAL PROPERTIES AND COLOR CHANGES OF TREATED FAST-GROWING WOODS WITH BORON COMPOUNDS, CHITOSAN, AND HEATING
DOI:
https://doi.org/10.59465/ijfr.2026.13.2.301-323Keywords:
Boric acid, chitosan, impregnation, physical properties, weatheringAbstract
This research aimed to evaluate the effects of boric acid preservative, chitosan, and heat treatments on physical properties, preservative leaching, and weathering resistance of two fast-growing woods. Manii (Maesopsis eminiii Engl.) and mindi (Melia azedarach Linn.) woods were impregnated with 5% boric acid preservative at a pressure of 7 kg cm-2 for 4 hours. The next step involves a second-stage impregnation with chitosan (at a 2% concentration), and mixed combination of boric acid-chitosan, under the same pressure and duration. The final step was heat-treatment at 70 ºC and 140 ºC under atmospheric conditions for 4 hours. The retention of boric acid in manii and mindi woods was 18,1 ± 0,8 kg m-3 and 12,7 ± 0,9 kg m-3, respectively. The interaction of boric acid, chitosan, and heat treatments significantly affected the density, water absorption, leaching, wood dimensional stability, shrinkage, and wood resistance to weathering. Impregnation boric acid-chitosan mixture and heating at 140 ºC (M140) successfully increased the density, ASE, and reduced water absorption and leaching in manii and mindi woods.
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