Effect of Nanofillers on the Polarization and Depolarization Current Characteristics of New LLDPE-NR Compound for High Voltage Application

Polymeric nanocomposites in which the nanosize fillers are evenly distributed in the polymer material attract attention as an insulating material due to their ability to enhance the materials performance properties of electrical and mechanical. For high voltage (HV) insulation application, one of the targets is to obtain new insulators with improved dielectric properties. This paper presents the outcome of an experimental study to determine the conductivity level of the linear low-density polyethylene- (LLDPE-)natural rubber (NR) compound, filled with different amount of SiO2and TiO2nanofiller by using the polarization and depolarization current (PDC) measurement technique. linear low-density polyethylene (LLDPE) and natural rubber (NR) with the ratio composition of 80 : 20 are selected as a base polymer. The experiment was conducted to find PDC pattern and conductivity variations of each of the LLDPE-NR/SiO2and LLDPE-NR/TiO2samples. The results show that the addition of SiO2filler exhibited less conductivity compared to TiO2filler with certain percentage. From the study, it can be concluded that LLDPE-NR/SiO2is a better insulator compared with LLDPE-NR/TiO2.

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Application of PDC Analysis to Identify Effect of Electrical Tracking on Conductivity of LLDPE-NR Nanocomposite

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.785.325 ◽

2015 ◽

Vol 785 ◽

pp. 325-329

Author(s):

N.A.M. Jamail ◽

M.A.M. Piah ◽

Nor Asiah Muhamad ◽

Hanafiah Kamarden ◽

Qamarul Ezani Kamarudin

Keyword(s):

Electrical Performance ◽

Low Density Polyethylene ◽

Linear Low Density Polyethylene ◽

Polymeric Nanocomposites ◽

Depolarization Current ◽

Physical Conditions ◽

Measurement Results ◽

Polymeric Insulators ◽

Base Polymer ◽

Good Electrical Performance

Polymeric nanocomposites are widely used for high voltage outdoor insulating application due to their good electrical performance. Recently, SiO2, TiO2 and MMT nanofillers are being used as filler because there are listed as main nanofiller commonly used in electrical engineering. Natural rubber (NR) was used because the nature of the interphase is found to affect viscoelasticity and it develops several interphases with the Linear Low-Density Polyethylene (LLDPE) matrix. One of the problems associated with outdoor polymeric insulators is tracking of the surface which can directly influence the reliability of the insulator. This paper presents the outcome of an experimental study to determine the conductivity level of the LLDPE-NR compound, filled with different amount of SiO2, TiO2 and MMT nanofiller using Polarization and Depolarization Current (PDC) measurement technique. LLDPE and NR with the ratio composition of 80:20 were selected as a base polymer. Results show that different compositions as well as the surface physical conditions affect the PDC measurement results.

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Degradation of epoxidized natural rubber compatibilized linear low density polyethylene/ soya powder blends: the effect of natural weathering

Journal of Polymer Engineering ◽

10.1515/polyeng-2013-0002 ◽

2013 ◽

Vol 33 (7) ◽

pp. 579-588 ◽

Cited By ~ 5

Author(s):

S.T. Sam ◽

H. Ismail ◽

H.P.S. Abdul Khalil

Keyword(s):

Natural Rubber ◽

Exposure Period ◽

Natural Weathering ◽

Epoxidized Natural Rubber ◽

Low Density Polyethylene ◽

Low Density ◽

Linear Low Density Polyethylene ◽

Scanning Calorimetry ◽

Powder Blends ◽

Compatibilized Blends

Abstract In the present study, linear low density polyethylene (LLDPE)/soya powder blends were compatibilized with epoxidized natural rubber (ENR 50) and exposed to natural weathering. The exposure period for the blends was 1 year. It was found that the degradability of the compatibilized blends was higher than that of uncompatibilized blends. Fourier transform infrared (FTIR) spectra, the tensile test, scanning electron microscopy (SEM), and differential scanning calorimetry (DSC) were applied to analyze the degradability of the blends. IR spectra showed that the carbonyl index (CI) of the blends increased as a function of exposure period and soya powder content. The compatibilized blends gave higher carbonyl indices. The retention tensile strength and elongation at break (Eb) of the compatibilized blends after weathering was generally lower than for the uncompatibilized blends. The increase of crystallinity also indicated a reduction of the amorphous portion after degradation. The higher crystallinity in compatibilized blends further confirms the higher degradability of ENR 50 compatibilized blends. The weight loss and molecular weight change indicated that the incorporation of ENR 50 into LLDPE/soya powder blends can enhance the degradability of the blends upon outdoor exposure.

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Thermal Properties of Linear-Low Density Polyethylene (LLDPE)/Soya Spent Powder Blends with the Addition of Epoxidised Natural Rubber

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.795.433 ◽

2013 ◽

Vol 795 ◽

pp. 433-437 ◽

Cited By ~ 1

Author(s):

S.T. Sam ◽

N.Z. Noriman ◽

S. Ragunathan ◽

O.H. Lin ◽

H. Ismail

Keyword(s):

Thermal Properties ◽

Natural Rubber ◽

Mixing Time ◽

Low Density Polyethylene ◽

Low Density ◽

Linear Low Density Polyethylene ◽

Scanning Calorimetry ◽

Powder Composites ◽

Powder Content ◽

Internal Mixer

Soya spent powder as an inexpensive and renewable source has been used as a filler for linear-low density polyethylene (LLDPE) in this study. Linear-low density polyethylene (LLDPE)/soya spent powder composites were prepared by using Haake internal mixer. The mixing time was 10 minutes at 150°C with rotor speed 50 rpm. Epoxidised natural rubber (ENR 50) has been used as a compatibilizer in the present study. The thermal properties of the LLDPE/soya spent powder composites with and without ENR were studied with a differential scanning calorimetry (DSC). The crystallinity of the LLDPE/soya spent powder composites decreased with increasing soya spent powder content. However, the addition of ENR 50 as a compatibilizer increased the crystallinity of the LLDPE/soya spent powder composites.

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