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

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

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

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.

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