Ömer Faruk ÜNSAL, Yasin ALTIN, Ayşe ÇELİK BEDELOĞLU

Polianilin İle Fonksiyonelleştirilmiş Karbon Nanotüp/PDMS Nanokompozitlerin Dielektrik Özellikleri

Son yıllarda, yüksek uzunluk/çap oranı ile hafif ve sağlam kompozitler hazırlanmasını mümkün kılan karbon nanotüpler, yüksek ısıl ve elektriksel iletkenlikleri gibi benzersiz özelliklerinden dolayı iletkenlik veya dielektrik özellikleri yüksek polimer nanokompozitlerin üretiminde kullanılan bir malzeme olarak ortaya çıkmıştır. Bununla birlikte, bu malzemelerle polimerik nanokompozitlerin hazırlanması sırasında bazı problemlerle karşılaşılmaktadır. En büyük sorunlardan biri, bu iletken malzemeleri hazırladıktan veya polimere ekledikten sonra, iletken yapılarınedeniyle topaklanma, topak oluşturma eğilimi göstermeleridir. Bu nedenle, bu çalışmada ilk olarak, çok duvarlı karbon nanotüpler (MWCNT'ler) polianilinin iletken formu (PANI) ile fonksiyonelleştirilmiştir. Ardından, farklı konsantrasyonlarda fonksiyonelleştirilmiş çok duvarlı karbon nanotüplere sahip nanokompozit poli(dimetil siloksan) (PDMS) polimer filmler hazırlanmıştır. Daha sonra ise, filmlerin yapısal, morfolojik, elektriksel ve dielektrik özellikleri karakterize edilmiştir. Sonuç olarak, sadece % 1,5 PANI-CNT ilavesiyle, PDMS'nin dielektrik sabiti 1 Hz'de 47 kat arttırılmıştır. Burada ortaya konulduğu gibi dielektrik filmler kapasitörler, esnek elektronik, dielektrik elastomer ve yapay kas uygulamalarında kullanılabilir.

Anahtar Kelimeler:

Karbon Nanotüp (CNTs), İletken Polimer, Dielektrik, Polianilin (PANI), Polimer Nanokompozit, Poli (dimetil siloksan) (PDMS)

DIELECTRIC PROPERTIES OF POLYANILINE-FUNCTIONALIZED CARBON NANOTUBE/PDMS NANOCOMPOSITES

In recent years, carbon nanotubes (CNTs) have emerged as materials that are often used in the preparation of polymer nanocomposites with conductive or advanced dielectric properties due to their unique properties including high temperature and electrical conductivity, which allows the production of very light and robust materials with a very high length-to-diameter ratio. However, during the preparation of polymeric nanocomposites with these materials, some problems are encountered. One of the major problems is that after preparing these conductivematerials or adding them into the polymer, they tend to aggregate, forming agglomerate, due to their conductive structures. Therefore, in this study, firstly, multi-walled carbon nanotubes (MWCNTs) were functionalized with conductive form of polyaniline (PANI) and subsequently, the poly (dimethyl siloxane) (PDMS) polymer nanocomposite films with different concentrations of functionalized multi-walled carbon nanotubes were prepared. Then, the structural, morphological, electrical and dielectric properties of the films were characterized. As a result, with the addition of only 1.5% PANI-CNT, the dielectric constant of PDMS was increased by 47-fold at 1 Hz. The dielectric films like presented here can be used in capacitors, flexible electronics, dielectric elastomers and artificial muscle applications.

Keywords:

Carbon Nanotubes (CNTs), Conductive Polymer, Dielectric, Polyaniline (PANI), Polymer Nanocomposite, poly(dimethyl siloxane) (PDMS),

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