Measurements of dielectric properties of High Density Polyethylene-Nano-Composites

Measurement ◽  
2019 ◽  
Vol 134 ◽  
pp. 624-633 ◽  
Author(s):  
Ossama E. Gouda ◽  
Ahmed S. Haiba
Keyword(s):  
Dielectric Properties ◽  
High Density Polyethylene ◽  
High Density ◽  
Nano Composites

Electrical and dielectric sensitivities to thermal processes in carbon nanofiber/high-density polyethylene composites

2011 ◽  
Vol 18 (1-2) ◽  
pp. 51-60 ◽  
Author(s):  
Tian Liu ◽  
Weston Wood ◽  
Bin Li ◽  
Brooks Lively ◽  
Wei-Hong Zhong
Keyword(s):  
Dielectric Properties ◽  
Thermal Treatment ◽  
High Density Polyethylene ◽  
Ac Conductivity ◽  
Elevated Temperatures ◽  
Carbon Nanofiber ◽  
Polymeric Materials ◽  
High Density ◽  
Heating Process ◽  
Thermal Processes

AbstractOwing to the huge interface region existing in a polymer nanocomposite, the effects of thermal processes on properties of nanocomposites are much more complicated than in a pure polymer. It is therefore important to determine the effects of thermal processes on nanocomposites with different interfacial interactions between the nanofillers and the polymer matrix. It is also important to explore the performance changes for nanocomposites under elevated temperatures over pure polymers. In this investigation, we examined the correlation of thermal treatment with dielectric properties of carbon nanofiber (CNF) reinforced high-density polyethylene nanocomposites. The thermal treatment of specimens was conducted for up to 120 h at 87°C and 127°C. Then, alternating current (AC) conductivity and dielectric properties were tested after definite intervals of time. Their changing rates over treatment time were analyzed. The results revealed the approximate linear relationships of AC conductivity and dielectric constant vs. heating time. Modified CNF reinforced nanocomposites had less influence by the heating treatments exhibiting better thermal resistance. The change rates of AC conductivity σ and dielectric properties have higher sensitivity to the treatment at a higher temperature. This study provides potential for further research on application of electrical and dielectric signals to detect the effects of heating process on lifetime of polymeric materials.

Influence of Gamma-Irradiation on Dielectric Properties of Recycled Polyethylene Composites

2007 ◽  
Vol 1038 ◽  
Author(s):  
Ulmas Gafurov ◽  
Zekie Fazilova
Keyword(s):  
Experimental Data ◽  
Dielectric Properties ◽  
Gamma Irradiation ◽  
High Density Polyethylene ◽  
High Density ◽  
Dielectric Losses ◽  
Γ Irradiation ◽  
Ethylene Propylene ◽  
Recycled Polyethylene ◽  
Polyethylene Composites

AbstractThe influence of γ-irradiation on the dielectric losses (tg δ) and permittivity (ε′) of recycled high density polyethylene (HDPER) thermoplastic dynamic vulcanizates (TDV) has been investigated. The materials and composites that were studied include HDPER:EPDM, HDPER+EPDM+GTR, HDPER+EPDM+GTR/plast; EPDM (ethylene-propylene diamine).The experimental data obtained shows significant differences between dielectric properties different samples, as well as between the unirradiated and γ-irradiated samples.

Investigation of thermal and dielectric properties of Fe3O4/high-density polyethylene nanocomposites

2017 ◽  
Vol 51 (28) ◽  
pp. 3923-3929 ◽  
Author(s):  
Fatemeh Ahangaran ◽  
Ali Hassanzadeh ◽  
Sirous Nouri ◽  
Rasoul Esmaeely Neisiany
Keyword(s):  
Dielectric Properties ◽  
Crystalline Structure ◽  
High Density Polyethylene ◽  
Electrochemical Impedance ◽  
High Density ◽  
Degree Of Crystallinity ◽  
Scanning Calorimetry ◽  
Melt Mixing ◽  
Polyethylene Matrix ◽  
Average Size

High-density polyethylene nanocomposites containing Fe3O4 nanoparticles were prepared by employing melt mixing process. The amorphous Fe3O4 nanoparticles with average size about 50 nm were prepared by the conventional coprecipitation method from iron (ΙΙ and ΙΙΙ). Thermal and dielectric properties of high-density polyethylene and its nanocomposites were investigated via differential scanning calorimetry and electrochemical impedance spectroscopy. The crystalline structure of high-density polyethylene and Fe3O4/high-density polyethylene nanocomposite were studied by wide-angle X-ray diffraction, which confirmed orthorhombic crystalline structure. The results of thermal and dielectric analysis indicated that the addition of Fe3O4 nanoparticles to high-density polyethylene matrix leads to decreasing degree of crystallinity and improvement of dielectric constant.

Dielectric Properties and Relaxation Behavior of High Density Polyethylene (HDPE)

2015 ◽  
Vol 799-800 ◽  
pp. 1319-1324
Author(s):  
F. Benabed ◽  
Tahar Seghier
Keyword(s):  
Dielectric Properties ◽  
Dielectric Response ◽  
High Density Polyethylene ◽  
Chemical Structure ◽  
High Density ◽  
Dielectric Relaxation Spectroscopy ◽  
Dielectric Studies ◽  
Frequency Range ◽  
Wide Range

The method of dielectric spectroscopy is an instrument of choice for the diagnosis of insulation used in high voltage and also to assess the quality of the insulation of HV equipment such as transformers, cables, capacitors, etc...This method allows to estimating the state and the quality of the insulation using the dielectric response of the frequency range. In this article, we have presented results of dielectric studies in high-density polyethylene (HDPE) by means of dielectric relaxation spectroscopy (DRS) in frequency range 10-2 - 106 Hz and temperature between-60 and 60 °C, we will invest this method to measure the dielectric properties and evaluate the performance of this insulator witch has always been chosen as a model polymer material because it is the simplest polymer with respect to its chemical structure and is used in a wide range of applications in daily life.

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