İğne Çapı ve Besleme Hızının Elektro Çekim Tekniğiyle Üretilmiş Poliakrilonitril Nanoliflerinin Morfolojisine Etkisi

Öz

Elektro çekim tekniği, sahip olduğu avantajlar sayesinde nanolif üretiminde en çok kullanılan ve araştırılan yöntemdir. Üretilen nanolif morfolojisi üzerinde etkili olan elektro çekim parametrelerinde, bazı parametreler (viskozite, yüzey gerilimi vb.) birinci dereceden önemliyken bazıları (voltaj, çözelti besleme hızı vb.) da ikinci derece öneme sahiptir. Çeşitli polimerler için özellikle iğne çapı ve ortalama nanolif çapı arasında birbirinden farklı ilişkilerin gözlemlendiği tespit edilmiştir. Bu çalışmada, poliakrilonitril (PAN) polimeri için dört farklı iğne çapı ve dört farklı çözelti besleme hızı kullanılarak elektro çekim tekniğiyle üretilen nanoliflerin morfolojisi incelenmiştir. Üretilen nanoliflerin taramalı elektron mikroskobu (SEM) görüntüleri alınarak, bir görüntü analiz programı yardımıyla ortalama nanolif çapları ve varyasyonları ölçülmüştür. Sonuç olarak iğne çapındaki ve çözelti besleme hızındaki artışın ortalama nanolif çaplarında artışa neden olduğu görülmüştür. Bununla beraber kalın iğnelerde daha düşük nanolif çap varyasyonu elde edilmiştir. Özellikle 60 µL/min besleme hızı için iğne çapı artışının boncuklanmayı artırdığı gözlemlenmiştir.

Anahtar Kelimeler

• Elektro çekim,Nanolif,Poliakrilonitril,İğne çapı,Besleme hızı

Effect of Needle Diameter and Flow Rate on Electrospun Polyacrylonitrile Nanofiber Morphology

Öz

Due to the advantageous properties, electrospinning is the most common method in nanofiber production. While some electrospinning parameters (viscosity, surface tension etc.) are fundamentally important on nanofiber morphology, the others (applied voltage, feed rate etc.) are also important. Different relationships between needle diameter and average nanofiber diameter for various polymers have been mentioned in the literature. In this study, the effect of needle diameter and flow rate on morphology of electrospun polyacrylonitrile (PAN) nanofibers are investigated. Scanning electron microscopy (SEM) is used for determination of morphology and also an image processing software is used for determination of average diameter and standard deviation of PAN nanofibers. The results show that, average nanofiber diameter increases with increasing of needle diameter and flow rate. Also, lower nanofiber diameter deviation is obtained in larger diameter needles. Also it is seen that, bead formation increases with increasing of needle diameter for especially 60 µL/min of feed rate value.

Anahtar Kelimeler

• Electrospin,Nanofiber,Polyacrylonitrile,Needle diameter,Flow rate

Kaynakça

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