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Effect of alumina and halloysite clay in silicone rubber nanocomposite on the electrical tree characteristics / Mohd Hafiz Ismail

Effect of alumina and halloysite clay in silicone rubber nanocomposite on the electrical tree characteristics_Mohd Hafiz Ismail _E3_2016_MYMY
Kajian kesan pengisi nano dalam SiR terhadap sifat dielektrik adalah masih baru. Oleh itu, kajian ini perlu diteruskan untuk mendapatkan pemahaman yang lebih jelas dan terang. Beberapa kajian telah dilaporkan bahawa pengisi nano-alumina dan tanah liat haloisit mampu meningkatkan ciri-ciri elektrik dan mekanik dalam bahan polimer seperti dalam nanokomposit epoxy dan LDPE. Oleh itu, dalam kajian ini kesan pengisi nano-alumina dan tanah liat haloisit dalam SiR terhadap ciri-ciri elektrik seperti voltan permulaan pokok (TIV), proses perkembangan pokok elektrik, kebarangkalian kejadian struktur pokok elektrik, jenis-jenis pokok elektrik, panjang pokok elektrik dan kadar perkembangan pokok elektrik telah dikaji. Selain itu, medan elektrik maksimum, kerosakan terkumpul dan faktor perkembangan juga telah dipelajari dan dikaji. Analisis struktur permukaan nanokomposit SiR/Alumina dan SiR/Tanah liat haloisit juga telah dilakukan menggunakan pengimbas Elektron Mikroskop (SEM). Selain itu, jarak antara zarah-zarah nano (permukaan ke permukaan) di dalam nanokomposit SiR/Alumina yang dianalisa menggunakan mesin SEM dipastikan dengan menggunakan perisian ImejJ dan persamaan untuk pengiraan jarak antara zarah-zarah juga turut dibincangkan. Keputusan telah menunjukkan 2 vol% nano-alumina di dalam SiR berkemampuan untuk memperbaiki ciri-ciri pokok elektrik seperti voltan permulaan pokok, panjang pokok elektrik dan kadar perkembangan pokok elektrik berbanding SiR yang asli. Walau bagaimanapun pengisian nano-alumina kepada 3 vol% telah menjatuhkan TIV secara drastik dan menyebabkan kadar perkembangan pokok dan pecah tebat berlaku dengan cepat. Sebaliknya pengisian tanah liat haloisit sehingga 3 vol% dalam SiR telah memperbaiki voltan permulaan pokok, panjang pokok elektrik dan kadar perkembangan pokok elektrik berbanding SiR yang asli. Keputusan ini menunjukkan pengisian nano-alumina sehingga 2 vol% dan pengisian tanah liat haloisit sehingga 3 vol% di dalam SiR cenderung untuk pokok elektrik muncul dengan pokok jenis bush. Selain itu ia juga telah meningkatkan medan elektrik maksimum, kurangkan peratusan kerosakan terkumpul dan faktor perkembangan terjadi lebih kurang 1. Selain itu, keputusan dari analisa imej SEM menunjukkan bahawa nano-alumina bertaburan secara sekata sehingga 2 vol% walau bagaimanapun pengisian sehingga 3 vol% pengisi nano-alumina dalam SiR cenderung terjadinya gumpalan pada pengisi nano. Jarak antara zarah-zarah nano dalam nanokomposit SiR/Alumina( permukaan ke permukaan) pada 1 vol% dan 2 vol% hampir sama setelah dipastikan dengan menggunakan perisian ImejJ dan persamaan untuk pengiraan jarak antara zarah-zarah. Sementara itu, untuk tanah liat haloisit, pengisi nano bertaburan sekata sehingga 3 vol%. __________________________________________________________________________________ The research on the effect of nanofiller in SiR on the dielectric properties is still new. Thus, it needs to be explored to expand on past work in the field for better understanding. It has been reported that research on nano-alumina and halloysite nanoclay have been carried out where the nanofillers has an ability to enhance the electrical and mechanical properties in other polymer material such as in epoxy and LDPE nanocomposites. Thus in this research, the influence of nano-alumina and halloysite nanoclay in SiR on the electrical tree characteristics tree such as tree inception voltage (TIV), electrical tree growth process, probability occurrences of electrical tree structure, types of electrical tree, electrical tree length and electrical tree growth rate are investigated. In addition, maximum of electrical field, accumulate damage and expansion coefficient are also studied and investigated. Surface morphology analysis of SiR/Alumina nanocomposites and SiR/Halloysite clay nanocomposites using Scanning Electron Microscopy (SEM) are also performed. Furthermore, the inter particle distance of nanofiller (surface to surface) in SiR/Alumina nanocomposites analyzed from SEM images are evaluated using ImageJ software and inter particles distance equation is also discussed. The results have revealed that 2 vol% nano-alumina has an ability to improve the electrical tree characteristics such as tree inception voltage (TIV), electrical tree length, electrical tree growth rate compared to unfilled SiR. However the increase of nano-alumina up to 3 vol% drops the TIV and contributes to rapid electrical tree growth rate and insulation breakdown. On the other hand, the presence of halloysite nanoclay up to 3 vol% in SiR has improved the TIV, electrical tree length,electrical tree growth rate compared to the unfilled SiR. It is shown that, the addition of nano-alumina up to 2 vol% and up to 3 vol% for halloysite nanoclay in SiR tends the tree structure appeared in bush type tree. Furthermore, it has also increased the maximum electrical field, reduced the percentage of accumulate damage and the expansion coefficient is varied almost to unity. In addition, the result from SEM image analysis depicted that nano-alumina is homogenously dispersed up to 2 vol% however further increase of 3 vol% nano-alumina in SiR yielded to the filler agglomeration. The inter particle distance of nano-alumina (surface to surface) in SiR/Alumina nanocomposites at 1 vol% and 2 vol% are considered similar evaluated by using ImageJ software and inter particles distance equation. Meanwhile, the halloysite nanoclay in SiR is homogenously dispersed up to 3 vol%.
Contributor(s):
Mohd Hafiz Ismail - Author
Primary Item Type:
Thesis
Identifiers:
Accession Number : 875008380
Language:
English
Subject Keywords:
nanocomposites; morphology; SiR/Alumina
Sponsor - Description:
Pusat Pengajian Kejuruteraan Elektrik & Elektronik -
First presented to the public:
12/1/2016
Original Publication Date:
10/21/2019
Previously Published By:
Universiti Sains Malaysia
Place Of Publication:
School of Electrical & Electronic Engineering
Citation:
Extents:
Number of Pages - 137
License Grantor / Date Granted:
  / ( View License )
Date Deposited
2019-10-21 11:52:29.218
Date Last Updated
2020-11-13 11:23:15.703
Submitter:
Mohamed Yunus Yusof

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Effect of alumina and halloysite clay in silicone rubber nanocomposite on the electrical tree characteristics / Mohd Hafiz Ismail1 2019-10-21 11:52:29.218