Dielectric properties of epoxy nanocomposites filled with boron nitride nanoparticles
Başlık çevirisi mevcut değil.
- Tez No: 402434
- Danışmanlar: DR. THOMAS ANDRITSCH, DR. IGOR GOLOSNOY
- Tez Türü: Yüksek Lisans
- Konular: Bilgisayar Mühendisliği Bilimleri-Bilgisayar ve Kontrol, Elektrik ve Elektronik Mühendisliği, Computer Engineering and Computer Science and Control, Electrical and Electronics Engineering
- Anahtar Kelimeler: Belirtilmemiş.
- Yıl: 2015
- Dil: İngilizce
- Üniversite: University of Southampton
- Enstitü: Yurtdışı Enstitü
- Ana Bilim Dalı: Elektronik ve Bilgisayar Eğitimi Ana Bilim Dalı
- Bilim Dalı: Belirtilmemiş.
- Sayfa Sayısı: 51
Özet
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Özet (Çeviri)
Polymeric insulation materials have gained considerable importance over the last decades because of their excellent features, such as their mechanical, electrical and thermal characteristics. Adding nanoparticles into the host material is claimed as being an effective way for improving insulator properties. There have been a number of researches carried out in this sector. Whereas some researches have reported that the addition of nanoparticles has enhanced insulator features, others have shown that nanoparticle have affected insulator materials negatively. They explain that there are a number of factors which yield unfavourable results. Firstly, the bad dispersion of particles can result in decreasing material properties. Furthermore, ambient conditions could also decrease the strength of their properties, such as humidity content and temperature. In addition, the particles' shape and size might have an effect on the materials. Finally, particles without surface treatment might negatively affect the material's properties. In this project, boron nitride (BN) nanoparticles reinforced with epoxy-based nanocomposites were studied with three different loading concentrations: 0%, 2.5%, and 5%. Initially, it was decided to prepare a 10% concentration instead of a 2.5% concentration, but due to preparation difficulties, the lower concentration was opted for. Firstly, dielectric spectroscopy measurements were conducted on the samples ranging from 0.1Hz to 1MHz. Then, the AC and DC breakdown strengths of the materials were tested. Next, in order to investigate the material's mechanical properties, a tensile test was carried out. Finally, a TGA (thermo gravimetric analysis) was done for the purpose of observing the water content and filler concentration of the samples. This study has shown that, by increasing the loading concentrations, the real part of the complex's permittivity increased, whereas its imaginary part decreased. A decrease was observed when the percentage of particles increased in both the AC and DC breakdown strength of the complex; nevertheless, the distribution parameter (β) increased with the introduction of nanoparticles. The same trend was seen in the tensile strength of the materials, with the addition of nanoparticles decreasing their mechanical properties. After a TGA was carried out, a high water content was observed, with 2.8% for the pure epoxy, 1.7% for 2.5% BN, and 1.5% for 5% BN. In addition, the filler contents of the nanocomposites were 2.2% and 4.99%. Finally, some future works were suggested in order to improve materials properties and different experiments which can be carried out was given.
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