Production of cellulose nanocrystallites from poplar wood (Populus nigra x Populus deltoides)

Öz

Cellulose is one of the most abundant, renewable, biodegradable natural polymer. Cellulose nanocrystallites were obtained from lignocellulosic resources, various sea animals (tunicin, chitin) and bacterial cellulose. Recently, there has been an increased interest in the production of nanocrystals from cellulose. In this study, the pulps were produced from poplar wood chips by kraft pulping method with the addition of sodium borohydride (NaBH4). Firstly, -cellulose was produced from the pulp and then cellulose nanocrystallites were produced from this -cellulose. The effect of the NaBH4 addition (0%, 0,3%, 0,5% and 0,7%) on the screened pulp yields were determined and found that increasing the NaBH4 addition, increased the screened pulp yield. Addition of the 0,7% NaBH4 into cooking liquor improved the yields of the pulp, -cellulose and nanocrystallite around 5,5%, 7,4% and 3,4%, respectively. The produced nanocrystallites were characterized with Atomic Force Microscope (AFM). The dimensions of the nanocrystallites produced from poplar wood were measured 10±4 nm width and 250±80 nm long by AFM analysis. Keywords: Poplar pulp, Sodium borohydrade added kraft pulp, -cellulose, Cellulose nanocrystallites

Anahtar Kelimeler

• Poplar pulp, Sodium borohydrade added kraft pulp, -cellulose, Cellulose nanocrystallites

Kavak (Populus nigra x Populus deltoides) odunundan selüloz nanokristalit eldesi

Öz

Selüloz yeryüzünde en yaygın bulunan, yenilenebilir ve biyolojik olarak bozunabilen doğal bir polimerdir. Farklı kaynaklardan örneğin lignoselülozik materyaller, çeşitli deniz hayvanları (tunisin, kitin) ve bakterilerden selüloz nanokristalit eldesi gerçekleştirilmiştir. Son yıllarda selülozdan nanoparçacık eldesi üzerine çalışmalar yoğunluk kazanmıştır. Bu çalışmada kavak odunundan sodyum borhidrür (NaBH4) ilaveli kraft kağıt hamuru pişirme yöntemi ile kağıt hamuru üretimi gerçekleştirilmiştir. Üretilen kağıt hamurlarından önce -selüloz ve bunlardan da asit hidroliz tekniği kullanılarak selüloz nanokristalit eldesi başarı ile gerçekleştirilmiştir. Farklı oranlarda (%0,3, %0,5 ve %0,7) NaBH4 ilavesi kağıt hamuru elenmiş verimi üzerine etkisi belirlenmiş, NaBH4 ilavesindeki artış elenmiş kağıt hamuru verimini artırmıştır. Pişirme esnasında %0,7 oranında NaBH4 ilavesi kağıt hamuru verimini %5,5 oranında, -selüloz verimini %7,4 ve nanokristalit verimini %3,5 oranında artırmıştır. Üretilen selüloz nanokristalitleri atomik güç mikroskobunda (AFM) karakterize edilmiştir. AFM analizleri ile kavak odunundan üretilen selüloz nanokristalit boyutları 10 ± 4 nm çapında ve 250±80 nm uzunluğunda olduğu ölçülmüştür. Anahtar kelimeler: Kavak kağıt hamuru, Sodyum borhidrür ilaveli kraft pişirme, -selüloz, Selüloz nanokristalit

Anahtar Kelimeler

• Kavak kağıt hamuru, Sodyum borhidrür ilaveli kraft pişirme, -selüloz, Selüloz nanokristalit

Kaynakça

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