Preparation, Characterization, Thermal, and Dielectric Properties of NVC-EMA Copolymer and Composites with Graphite

Abstract

This study analyzed polymer composite materials for applications which require processability and thermal stability. At the same time, dielectric properties were investigated to determine their capacity for energy storage. For this purpose, poly(N-vinyl carbazole-co-ethyl methacrylate), P(NVC-co-EMA), copolymer was synthesized through free radical polymerization, and composites with graphite (GR) were prepared to improve its thermal and dielectric properties. The composition of the copolymer was determined with 1H-NMR spectroscopy, and calculations indicated that 56% NVC and 44% EMA units were present in its composition. DSC analysis of P(NVC0.56-co-EMA) and its composites showed that the glass transition temperature of the polymer, which was 119.98 °C, decreased with the addition of graphite. TGA analysis confirmed higher thermal stability of graphite-doped composites compared to polymer. The thermal degradation kinetics of both the copolymer and its composite containing 10 wt% graphite were studied through utilization of the Flynn-Wall-Ozawa (FWO) and Kissinger-Akahira-Sunose (KAS) methods. Calculations showed that GR doping decreased the thermal decomposition activation energy values of the copolymer. In the dielectric measurements, it was determined that the dielectric constant (Ɛ') and dielectric loss (Ɛ'') values increased when there was a higher concentration of GR in the composites.

Keywords

• N-vinylcarbazole
• Ethyl methacrylate
• Graphite
• Thermal analysis
• Dielectic properties

NVC-EMA Kopolimerinin ve Grafit ile Kompozitlerinin Hazırlanması, Karakterizasyonu, Termal ve Dielektrik Özellikleri

Abstract

Bu çalışmada, işlenilebilirlik ve termal kararlılık gerektiren uygulamalar için polimer kompozit malzemeler çalışılmıştır. Aynı zamanda, enerji depolama uygulamaları için dielektrik özellikleri araştırılmıştır. Bu amaçla poli(N-vinil karbazol-ko-etil metakrilat), P(NVC-ko-EMA), kopolimeri serbest radikal polimerizasyonu yoluyla sentezlenmiş, termal ve dielektrik özelliklerini geliştirmek için grafit (GR) ile kompozitleri hazırlanmıştır. Kopolimerin bileşimi 1H-NMR spektroskopisi ile belirlenmiş, yapılan hesaplamalar bileşiminde %56 NVC ile %44 EMA birimlerinin olduğunu ortaya koymuştur. P(NVC0.56-ko-EMA) ve kompozitlerinin DSC analizleri, polimerin 119.98 oC olan camsı geçiş sıcaklığının, grafit eklenmesi ile düştüğünü göstermiştir. TGA analizlerinde, polimere kıyasla grafit katkılı kompozitlerin termal kararlılıklarının daha yüksek olduğu görülmüştür. Hem kopolimerin hem de ağırlıkça %10 grafit içeren kompozitinin termal bozunma kinetiği Flynn-Wall-Ozawa (FWO) ve Kissinger-Akahira-Sunose (KAS) yöntemleriyle incelenmiştir. Hesaplamalar, GR katkılamasının kopolimerin termal ayrışma aktivasyon enerjisi değerini düşürdüğünü göstermiştir. Yapılan dielektrik ölçümlerinde, kompozitlerde artan GR konsantrasyonu ile dielektrik sabiti (Ɛ') ve dielektrik kayıp (Ɛ'') değerlerinin arttığı belirlenmiştir.

Keywords

• N-vinil karbazol
• Etil metakrilat
• Grafit
• Termal analiz
• Dielektrik özellikler

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