Değişen emprenye ve reaksiyon süreleri altında asetillenmiş kayın odununun (Fagus orientalis L.) dinamik özelliklerinin tahribatsız değerlendirilmesi

Abstract

Bu çalışmanın amacı, tahribatsız titreşim testleri kullanarak, asetilasyon sırasında emprenye ve reaksiyon sürelerinin kayın ağacının dinamik mekanik ve akustik özellikleri üzerindeki etkisini incelemektir. Katkısız olarak asetik anhidrit ile emprenye yöntemiyle asetillenmiş katı kayın (Fagus orientalis L.) örnekleri hazırlanmıştır. Fırın kurusu, kusursuz örnekler (20 × 20 × 360 mm3; R × T × L) 120 ± 3 °C’de fırın kurusu koşullarında 60 veya 180 dakikalık emprenye süreleri ve 60 veya 120 dakikalık reaksiyon süreleri ile muamele edilmiştir. Modifiye ve modifiye edilmemiş örneklerin dinamik özellikleri, radyal ve teğet yönlerde serbest eğilme ve boyuna titreşim testleri ile ölçülmüştür. Emprenye ve reaksiyon süreleri, fiziksel ve dinamik özellikleri önemli ölçüde etkilemiştir. Uzun emprenye süresi (Im180) yoğunluk ve ağırlık kazanımını (WPG ≈ %4) artırmış, daha fazla kimyasal alımı ve azalmış gözenekliliği göstermiştir. Buna karşılık, uzun reaksiyon süresi (Re120) dinamik elastik modülü ve akustik katsayıyı yaklaşık %6-8 azaltmış, yüksek asetilasyon yoğunluğunda kısmi sertlik kaybını işaret etmiştir. Kütle kazanımı, sertlik korunumu ve akustik performans arasındaki en uygun denge, orta düzey koşullarda (Im60-Re60) sağlanmıştır.

Keywords

• Kayın
• Asetilasyon
• WPG
• MOE
• Yoğunluk
• Kesme
• Akustik

Thanks

The authors wish to thank for the support of the Department of Wood Science and Paper Technology, Ka.C., Islamic Azad University, Karaj, Iran.

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

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

• Beech
• Acetylation
• WPG
• MOE
• Density
• Shear
• Acoustic

Thanks

The authors wish to thank for the support of the Department of Wood Science and Paper Technology, Ka.C., Islamic Azad University, Karaj, Iran.

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