Performance of Brutian Pine (Pinus brutia Ten.) Particles Modified with NaOH in Board Production

Yıl 2018, Cilt: 9 Sayı: 2, 187 - 196, 11.07.2018

Abdullah Beram Samim Yaşar

https://doi.org/10.29048/makufebed.421675

Cited By: 4

Öz

In this study, particles from brutian pine (Pinus brutia Ten.)  were
soaked in 0.25, 0.50, 0.75 and 1% NaOH solutions. The changes in the chemical
and thermal properties of the particles caused by these treatments were indicated
and the effects of these treatments on the physical and mechanical properties
of the produced boards were evaluated. Main chemical component and fourier
transform infrared (FTIR) spectroscopic analysis showed that the extractive,
hemicellulose and lignin content of the particles decreased during the alkali
treatments, while the cellulose content increased. Thermogravimetric analysis
(TGA) indicated that the particles treated with NaOH solutions exhibited lower
thermal stability than the untreated particles. Alkali treatments caused water absorption (WA) and thickness swelling
(TS) increase of the produced particleboards. The mechanical properties of the
produced particleboards were improved by alkali treatments. The modulus of
elasticity (MOE), modulus of rupture (MOR) and internal bond (IB) strength
values of the produced particleboards met the requirements for general-purpose
particleboards used in dry conditions, as defined by the TS-EN 312 (2012)
standard.

Anahtar Kelimeler

Brutian pine, alkali treatment, chemical composition, particleboard, physical and mechanical properties

NaOH ile Modifiye Edilmiş Kızılçam (Pinus brutia Ten.) Yongalarının Levha Üretimindeki Performansı

Öz

Bu çalışmada, %0.25,
0.50, 0.75 ve 1’lik NaOH çözeltileri ile işlem görmüş kızılçam (Pinus brutia Ten.)  yongalarının kimyasal bileşimindeki ve termal
özelliklerindeki değişimler ve bu değişimlerin üretilen levhaların fiziksel ve mekanik
özellikleri üzerine etkileri değerlendirilmiştir. Ana kimyasal bileşen ve
fourier dönüşümlü kızılötesi (FTIR) spektroskopisi analizleri, alkali
işlemlerde NaOH derişimi arttıkça yongalardaki ekstraktif madde, lignin ve
hemiselüloz miktarlarında sürekli düşüş, selüloz miktarında ise sürekli artış
olduğunu göstermiştir. Termogravimetrik analiz (TGA) sonuçları, alkali işlemin
yongaların termal dayanıklılığını düşürdüğünü ortaya koymuştur. Uygulanan
alkali işlemler, üretilen levhaların su alma (SA) ve kalınlığına şişme (KŞ)
değerlerini sürekli artırmıştır. Üretilen levhaların mekanik özelliklerinin
uygulanan alkali işlem derişimi arttıkça gelişme gösterdiği belirlenmiştir.
Çalışmada üretilen levhalarda belirlenen eğilmede elastikiyet modülü (EM),
eğilme direnci (ED) ve yüzeye dik çekme direnci (YDÇD) değerlerinin TS EN 312
(2012) standardında belirtilen kuru şartlarda genel amaçlı kullanılan levhalar
için beklenilen değerlerden yüksek olduğu görülmüştür.

Anahtar Kelimeler

Kızılçam, alkali işlem, kimyasal bileşim, yongalevha, fiziksel ve mekanik özellikler

Kaynakça

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