Hindistan Cevizi Liflerinin Yüzey Özelliklerine, Termal Bozunma Davranışlarına ve Yapısal Karakterizasyonuna Oksidatif Modifikasyonun Etkisi

Yıl 2018, Cilt: 25 Sayı: 111, 189 - 195, 01.10.2018

Yasemin Seki

Öz

Bu çalışma kapsamında,
Hindistan cevizi liflerinin kimyasal, yapısal, termal ve morfolojik
özelliklerine, bu lifler için yeni bir modifikasyon maddesi olan sodyum
perborat tetrahidratın etkisi incelenmiştir. Lifler sodyum perborat
tetrahidratın farklı konsantrasyonlardaki sulu çözeltileri ile modifiye
edilmiştir. Modifikasyon işlemlerinin liflerin yüzey kimyasına, fonksiyonel
gruplarına, termal bozunma davranışlarına, kristalin yapısına ve yüzey
özelliklerine etkisi sırası ile x-ışını fotoelektron spektroskopisi, fourier dönüşümlü kızılötesi
spektroskopisi, termogravimetrik analiz, x-ışını difraksiyonu ve taramalı
elektron mikroskobu ile incelenmiştir. Yapılan işlemlerin lifin yüzey
karbon/oksijeni arttırarak yüzey hidrofilliğini azalttığı, aynı zamanda lifte
bulunan lignin ve hemiselülozun varlığını gösteren absorpsiyon piklerinin
şiddetinde azalmaya neden olduğu ve lif yüzeyinde temizlik meydana getirdiği
tespit edilmiştir. Hindistan cevizi liflerinin kristalin yapısı yapılan modifikasyon
işlemlerinden önemli derecede etkilenmezken, modifikasyon sonucu ligninin
miktarında meydana gelen değişimle birlikte maksimum bozunma sıcaklıkları azalmıştır.
Modifikasyon sonrası kül miktarında meydana gelen artışla birlikte liflerin güç
tutuşurluk özelliğinde iyileşme meydana gelebileceği belirlenmiştir.

Anahtar Kelimeler

Hindistan cevizi lifleri, selüloz, kompozit, sodyum perborat tetrahidrat

The Effects of Oxidative Modification on the Surface Properties, Thermal Degradation Behavior and StructuralCharacterization of Coir Fibers

Öz

In this study, the effect of sodium perborate tetra hydrate
that is a new alternative modification agent for coir fibers was investigated on
chemical, structural, thermal and morphological properties of the fibers. The
coir fibers were modified at different concentrations of sodium perborate tetra
hydrate aqueous solutions. The effects of the modifications on surface
chemistry, functional groups, thermal degradation behavior, crystalline
structure and surface properties were investigated by fourier transform
infrared spectroscopy, thermogravimetric analyses, x-ray difraction and
scanning electron microscopy, respectively. According to the results, the
modification processes decreased fiber surface hydrophilicity by increasing
carbon/oxygen ratio and also decreased the intensities of the absorption peaks
indicating hemicellulose and lignin. Cleaner fiber surface was achieved after
the modifications. However, crystalline structure of the fiber was not affected
significantly. The maximum degradation temperatures decreased with changes in
lignin content of the fibers. The char yield values of the fibers increased after
the modification which can possibly indicate enhancement in flame retardancy. 

Anahtar Kelimeler

Coir fibers, cellulose, composite, sodium perborate tetra hydrate

Kaynakça

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