Silika Aerojelin Hidrofobik Polistiren Nanoliflerin Termal Özellikleri Üzerine Etkisi

Year 2023, Volume: 23 Issue: 6, 1497 - 1506, 28.12.2023

Refik Arat

https://doi.org/10.35414/akufemubid.1257557

Abstract

Bu çalışmada, tetraetilen ortosilikat (TEOS) öncülünden sol-jel reaksiyonu ile sentezlenen silika aerojelleri (SA) içeren, elektroeğirme yöntemiyle üretilmiş hidrofobik polistiren (PS) bazlı nanoliflerin yapısal, morfolojik, ıslanabilirlik ve termal özellikleri sırasıyla FTIR, SEM, su temas açısı, DSC ve TGA analizleriyle incelenmiştir. FTIR analizi, SA’nın fiziksel bağlarla PS matrise dağıldığını, polimerin moleküler yapısını değiştirmediğini göstermiştir. SEM görüntülerinde SA miktarının artmasıyla birlikte nanolif çaplarında azalma, buna karşın topak oluşumunda ve yüzey pürüzlülüğünde artış görülmüştür. Ayrıca, yapısındaki Si–OH grupları nedeniyle artan SA miktarına bağlı olarak hidrofobik PS nanoliflerin su temas açılarında azalma meydana gelmiştir. Termal özelliklere bakıldığında, SA miktarının artmasıyla beraber PS bazlı nanoliflerin camsı geçiş sıcaklıklarında azalma meydana gelmiştir. Bu durum SA’ların plastikleştirici gibi davranarak polimer zincirleri arasındaki serbest hacmi arttırmasından ve zincir hareketlerini kolaylaştırmasından kaynaklanmıştır. Diğer taraftan SA miktarı arttıkça nanoliflerin termal dayanımları artmış, maksimum bozunma sıcaklıkları 33⁰C ötelenmiştir. Sonuçta SA katkısı, PS bazlı nanoliflerin hidrofobik özelliğini düşürse de plastikleştirici etkisiyle PS’nin işlenebilme sıcaklığını azaltmış, termal kararlılığını arttırmış ve daha geniş yüzey alanına sahip daha ince nanoliflerin eldesine imkan vermiştir.

Keywords

polistiren, silika aerojel, elektroeğirme, nanolif

Effect of Silica Aerogel on Thermal Properties of Hydrophobic Polystyrene Nanofibers

Abstract

In this study, the structural, morphological, wettability and thermal properties of hydrophobic polystyrene (PS) based electrospun nanofibers, which contains the silica aerogels (SA) synthesized from tetraethylene orthosilicate (TEOS) precursor by sol-gel reaction, were investigated by FTIR, SEM, water contact angle, DSC and TGA analyzes, respectively. FTIR analysis showed that the SA dispersed into the PS matrix by physical bonds and did not change the molecular structure of the polymer. The SEM images displayed that the nanofiber diameters decreased with increasing SA amount, while agglomeration and surface roughness increased. In addition, the water contact angle of the hydrophobic PS nanofibers decreased due to the increased amount of SA containing the Si–OH groups in its structure. Considering the thermal properties, the glass transition temperature of PS based nanofibers decreased with the increase of SA amount. This is due to the fact that the SA act as plasticizers, increasing the free volume between polymer chains and facilitating the chain movements. On the other hand, as the amount of SA increased, the thermal stability of the nanofibers increased, and the maximum decomposition temperature was shifted by 33⁰C. As a result, the SA additives facilitated the processability of the PS matrix thanks to their plasticizing effect, and increased the thermal stability of the nanofibers. Even though the additives reduced the hydrophobic properties of the nanofibers, provided the formation of thinner fibers with larger surface areas.

Keywords

polystyrene, silica aerogel, electrospinning, nanofiber

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