Non-destructive assessment of dynamic properties of acetylated beech wood (Fagus orientalis L.) under varying impregnation and reaction times

Authors : Seyyed Khalil Hosseinihashemi, Mojtaba Esfandyar

Pages : 430-444

Doi:10.33725/mamad.1804312

View : 67 | Download : 134

Publication Date : 2025-12-25

Article Type : Research Paper

Abstract :The aim of this study was to investigate the effect of impregnation and reaction times during acetylation on the dynamic mechanical and acoustic properties of beech wood using non-destructive vibration testing. Acetylated solid wood from beech (Fagus orientalis L.) was prepared with acetic anhydride, without catalyst, by soaking impregnation. Oven-dried, defect-free specimens (20 × 20 × 360 mm3; R × T × L) were treated at 120 ± 3 °C under oven-dry conditions with impregnation times of 60 or 180 min and reaction times of 60 or 120 min. Dynamic properties of modified and unmodified samples were measured by free flexural and longitudinal vibration tests in radial and tangential directions. Impregnation and reaction durations significantly affected physical and dynamic properties. Longer impregnation (Im180) increased density and weight percent gain (WPG ≈ 4%), indicating greater chemical uptake and reduced porosity. In contrast, extended reaction time (Re120) reduced the dynamic modulus of elasticity and acoustic coefficient by about 6-8%, suggesting partial stiffness loss at higher acetylation intensity. The best balance between mass gain, stiffness retention, and acoustic performance occurred at moderate conditions (Im60-Re60).
Keywords : Kayın, Asetilasyon, WPG, MOE, Yoğunluk, Kesme, Akustik

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