Islak Elektroeğirme ile PS/PVC/Bi2O3 Nanokompozit Liflerin Elektriksel Eğirilebilirliğinin Sağlanması

Öz

İşlem, çözelti ve çevresel parametrelerin elektrospun yüzeylerin karakteristik özellikleri üzerinde önemli etkilerinin olduğu bilinmektedir. Elektrospinning yöntemi, çeşitli katkı maddeleri ile takviyelendirilmiş polimer çözeltilerden lifsi yüzey üretimine olanak tanıdığından dolayı, fonksiyonel, hafif ve yenilikçi yüzeylerin üretimi açısından gelecek vaad eden bir tekniktir. Bu çalışmada yüksek ve orta düzeyde radyasyon kalkanlama etkinliklerine sahip olan PS ve PVC polimeri ve bu polimerlerin çözücüleri ile hazırlanan ikili polimer çözeltisine Bi2O3 tozu ilave edilmiştir. Elektrospun yüzeylerin karakterizasyonu sonucunda, hazırlanan polimer çözeltisinin işlem, çözelti ve çevresel parametreler sabit tutularak ıslak elektroeğirme tekniği ile eğirilebilirliğinin mümkün olduğu gözlenmiştir. Islak elektroeğirme yöntemi ile üretilen yüzeylerde ortalama lif çapının 979.18 nm olduğu, daha kalın yüzey eldesinin sağlandığı ve sadece bir kaç boncuk oluşumunun var olduğu görülmüştür. Ancak kuru elektroeğirme tekniği ile üretilen yüzeylerde ortalama nanolif çapı daha ince (271.22 nm) olmasına karşın yoğun boncuk oluşumu tespit edilmiştir. Islak ve kuru elektroeğirme yöntemleri ile üretilen yüzeylerin benzer kristalin özellikler sergiledikleri tespit edilmiş ve moleküller arası yeni bağ oluşumuna rastlanmamıştır. Islak elektroeğirme tekniği ile üretilen yüzeylerin, kuru elektroeğirme ile üretilen yüzeylerden yaklaşık 65 kat daha kalın olduğu görülmüştür. Islak elektroeğirmede, kollektör içerisinde distile su gibi yüksek yüzey gerilimine sahip akışkan kullanımın üretilen yüzey düzgünsüzlüğünü geliştirdiği, boncuk oluşumunu azalttığı, lif-lif arası etkileşimi kolaylaştırdığı ve gözenek dağılımını olumlu yönde etkilediği tespit edilmiştir.

Anahtar Kelimeler

• Bizmut oksit
• polistiren
• polivinil klorid
• ıslak elektroeğirme tekniği

Enabling the Electrospinnability of PS/PVC/Bi2O3 Nanocomposite Fibers via Wet Electrospinning

Öz

It has been well-known that process, solution and environmental parameters have significant effects on characteristics of electrospun mats. Electrospinning is a promising technique for manufacturing of functional, lightweight and novel surfaces due to producibility of fibrous mats from polymer solutions loaded with various additives. In this study, Bi2O3 was incorporated into binary polymer solutions prepared with polymers having high and moderate shielding efficiency (PS and PVC, respectively) and their appropriate solvents. The characterization of electrospun mats showed that electrospinnability of prepared solution was possible with wet electrospinning at identical process, solution and environmental conditions. It was noticed that the average fiber diameter was 979.18 nm, thicker nanofibrous mats were fabricated and a few bead formation was observed in wet electrospun mats. But bead-dominant structure was obtained in dry electrospun mats despite of finer average fiber diameter (271.22 nm). Similar crystalline structure and no distinct bond occurence was observed in wet and dry electrospun nanocomposite mats. The average mat thickness of wet electrospun mats was approximately 65 times higher than dry electrospun mat. In wet electrospinning, use of liquid in collector promoted surface unevenness, decreased beading formation, facilitated fiber-to-fiber interaction and influenced pore distribution positively due to high surface tension of distilled water.

Anahtar Kelimeler

• bismuth oxide
• polstyrene
• polyvinyl chloride
• wet electrospinning technique

Kaynakça

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