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  1. Article ; Online: Flame Retardancy and Excellent Electrical Insulation Performance of RTV Silicone Rubber

    Muhammad Tariq Nazir / Arslan Khalid / Imrana Kabir / Cheng Wang / Juan-Carlos Baena / Shakeel Akram / Muhammad Shoaib Bhutta / Ghulam Yasin / Bao Toan Phung / Guan Heng Yeoh

    Polymers, Vol 13, Iss 2854, p

    2021  Volume 2854

    Abstract: Room temperature vulcanized (RTV) silicone rubber filled with aluminum trihydrate (ATH) is substantially engaged in electrical outdoor insulation applications. The pristine silicone rubber is highly combustible. ATH filled silicone rubber offers ... ...

    Abstract Room temperature vulcanized (RTV) silicone rubber filled with aluminum trihydrate (ATH) is substantially engaged in electrical outdoor insulation applications. The pristine silicone rubber is highly combustible. ATH filled silicone rubber offers excellent electrical insulation but lacks in providing adequate flame retardancy. This short communication reports the novel results on improved flame retardancy of pristine and ATH filled silicone rubber whilst retaining the electrical insulation properties to a great extent. Results suggest that the presence of only one percent of graphene nanoplatelets with ATH sharply reduces the heat release rate and rate of smoke release. A minor reduction in dielectric breakdown strength and volume resistivity is noticed. Furthermore, permittivity and dielectric loss at power frequency suggest that a marginal 1% concentration of nanoplatelet with ATH is an excellent approach to fabricate flame retardant silicone rubber with an acceptable electrical insulation level.
    Keywords silicone rubber ; flame retardancy ; combustibility ; electrical insulation ; dielectric response ; dielectric breakdown ; Organic chemistry ; QD241-441
    Subject code 620
    Language English
    Publishing date 2021-08-01T00:00:00Z
    Publisher MDPI AG
    Document type Article ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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  2. Article ; Online: Steady-State Conduction Current Performance for Multilayer Polyimide/SiO 2 Films

    Muhammad Shoaib Bhutta / Shakeel Akram / Pengfei Meng / Jerome Castellon / Serge Agnel / Hui Li / Yecai Guo / Ghulam Rasool / Shahid Hussain / Muhammad Tariq Nazir

    Polymers, Vol 13, Iss 4, p

    2021  Volume 640

    Abstract: The steady-state electrical conduction current for single and multilayer polyimide (PI) nanocomposite films was observed at the low and high electric field for different temperatures. Experimental data were fitted to conduction models to investigate the ... ...

    Abstract The steady-state electrical conduction current for single and multilayer polyimide (PI) nanocomposite films was observed at the low and high electric field for different temperatures. Experimental data were fitted to conduction models to investigate the dominant conduction mechanism in these films. In most films, space charge limited current (SCLC) and Poole–Frenkel current displayed dominant conduction. At a high electric field, the ohmic conduction was replaced by current–voltage dependency. Higher conduction current was observed for nanocomposite films at a lower temperature, but it declined at a higher temperature. PI nanocomposite multilayer films showed a huge reduction in the conduction current at higher electric fields and temperatures. The conclusions derived in this study would provide the empirical basis and early breakdown phenomenon explanation when performing dielectric strength and partial discharge measurements of PI-based nanocomposite insulation systems of electric motors.
    Keywords polymer nanocomposites ; space charge limited current (SCLC) ; Poole–Frenkel ; conduction current ; multilayer insulation ; Organic chemistry ; QD241-441
    Subject code 620
    Language English
    Publishing date 2021-02-01T00:00:00Z
    Publisher MDPI AG
    Document type Article ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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  3. Article ; Online: Influence of Repetitive Square Voltage Duty Cycle on the Electrical Tree Characteristics of Epoxy Resin

    Peng Wang / Suxin Hui / Shakeel Akram / Kai Zhou / Muhammad Tariq Nazir / Yiwen Chen / Han Dong / Muhammad Sufyan Javed / Inzamam Ul Haq

    Polymers, Vol 12, Iss 2215, p

    2020  Volume 2215

    Abstract: The application of wide band-gap power electronic devices brings more challenges to insulating packaging technology. Knowing the influence of applied voltage parameters on insulation performance is helpful to evaluate the insulation condition of electric ...

    Abstract The application of wide band-gap power electronic devices brings more challenges to insulating packaging technology. Knowing the influence of applied voltage parameters on insulation performance is helpful to evaluate the insulation condition of electric power equipment. In this paper, the effect of repetitive square wave voltage duty cycle on the growth characteristics of electrical trees in epoxy resin was studied. The experimental results show that the square wave voltage duty cycle has a significant influence on treeing features. The electrical tree proportion initiation has shown a decreasing trend, and the shape of the electrical tree changes from pine-like to branch-like by increasing the duty cycles. The length and damaged area of electrical tree increased with the increase in the duty cycle up to 10% and then decrease by increasing the duty cycle higher than 30%. It indicates that a low duty cycle will enhance the electron injection and accumulate space charges and thus accelerate electrical tree development. Under short duty cycles, the electric field due to the shielding effect near the needle tip suppresses the electrical tree growth, which results in treeing growth stagnation. The obtained results are helpful to keep these parameters in mind during the design of epoxy-based insulation such high-voltage rotating machines and power electronic device packaging.
    Keywords epoxy resin ; electrical tree ; duty cycle ; power electronic devices ; square wave voltage ; electric machines insulation ; Organic chemistry ; QD241-441
    Subject code 621
    Language English
    Publishing date 2020-09-01T00:00:00Z
    Publisher MDPI AG
    Document type Article ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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  4. Article ; Online: Simulation and Experimental Investigation on Carbonized Tracking Failure of EPDM/BN-based Electrical Insulation

    Muhammad Tariq Nazir / Faizan Tahir Butt / Bao Toan Phung / Guan Heng Yeoh / Ghulam Yasin / Shakeel Akram / Muhammad Shoaib Bhutta / Shahid Hussain / Tuan Anh Nguyen

    Polymers, Vol 12, Iss 3, p

    2020  Volume 582

    Abstract: Correspondence: tariq [.] ...

    Abstract * Correspondence: tariq [.]
    Keywords n/a ; Organic chemistry ; QD241-441
    Language English
    Publishing date 2020-03-01T00:00:00Z
    Publisher MDPI AG
    Document type Article ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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    Inter-library loan at ZB MED

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