Surface degradation of styrene acrylonitrile exposed to corona discharge

Handala, Mohand Amokrane; Lamrous, Omar

doi:10.1002/etep.189

Cited by 12 publications

(5 citation statements)

References 38 publications

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“…The work of Moudoud and others [30] showed that the electrical ageing induces a change in the polymethyl methacrylate color. In the work concerning the styrene acrylonitrile surface degradation exposed to corona discharge, Handala and Lamrous [31] observed a change in the material appearance. They indicated that these evolutions are due to oxidation or functional group elimination along the polymer chain.…”

Section: Termination Stepmentioning

confidence: 99%

Effect of Ultraviolet Radiations on Medium and High Voltage Cables Insulation Properties

Hedir¹,

Moudoud²

2016

IJET

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Under operating conditions effect, insulated power cables can undergo critical degradations. Ultraviolet (UV) radiations are one of the most destructive constraints which affect the properties of the material used for insulation. Because of its good properties, crosslinked polyethylene (XLPE) is widely used in medium voltage (MV) and high voltage (HV) cables insulation. Regardless of its excellent performances, XLPE can degrade when exposed to UV. The objective of this work is to report experimental results concerning the effect of accelerated UV ageing on the properties of XLPE insulation. For this purpose, dielectric characterization, visual observations and scanning electron microscopy (SEM) analysis are performed to assess the extent of ageing. Obtained results show that UV ageing affects greatly the XLPE insulation. So, an evolution in the dielectric properties (dielectric constant, dissipation factor, dielectric loss index and AC volume resistivity), color change and deterioration of surface morphology with ageing time are noticed.

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Section: Termination Stepmentioning

confidence: 99%

Effect of Ultraviolet Radiations on Medium and High Voltage Cables Insulation Properties

Hedir¹,

Moudoud²

2016

IJET

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“…Several works focused on the study of the electric breakdown phenomenon of insulating materials and its corresponding driving force have been reported [1,3,[5][6][7][8][9][10][11][12][13][14]. Electric breakdown occurs when the current flowing through the sample increases, leading to its failure and consequently, the applied voltage cannot be stable.…”

Section: Introductionmentioning

confidence: 99%

Influence of empty space and internal stresses on dielectric strength in two-phase polymer

Lambri

Tarditti

Cano

et al. 2013

IEEE Trans. Dielect. Electr. Insul.

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In the present work, a study on the dependence of the Dielectric Strength (DS) as a function of the empty space and the internal stresses into polymer samples has been performed. The empty space was measured by means of positron annihilation lifetime spectroscopy. The internal stresses into the polymer matrix, due to the appearance of the crystalline zones, were determined by applying the inclusion theory results to the dynamic mechanical analysis measurements. Attention to the effect of the chain movement on the electrical breakdown process has been paid. The study has been performed at a mesoscopic scale with the aim of demonstrating the influence of the thermal, mechanical or electrical stresses on the chains movement and their effect on the dielectric breakdown phenomenon. It has been verified that, DS is a function of the empty space into the sample and also of the internal stresses acting at the polymer chains, which result from the crystalline state promoted by chemicrystallization. The empty space decrease and the internal stresses act overlapped against the electrical force operating on the polymer chains. It is deduced from the work, that the precursor phenomenon for the electrical breakdown is the bend of polymer chains, prior to the onset of their collective movement promoted by the electrical forces.Index Terms -EPDM, molecular chain movements, electric breakdown, positron annihilation lifetime spectroscopy, dynamic mechanical analysis.

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“…To investigate the impacts of long-term corona discharges on the hydrophobicity characteristics of composite insulator surface as well as on the ageing involved, different artificial corona ageing tests [1,5,10,15,16,[23][24][25][26][27][28][29][30][31][32] have been developed, so as to avoid the randomness of distribution and uncontrollability of the discharge intensity. The work carried out internationally and concentrating on investigations of the "polymer-corona" system in high voltage outdoor applications has been summarized in our former paper [33].…”

Section: Introductionmentioning

confidence: 99%

AC and DC zone-induced ageing of HTV silicone rubber

Gubanski

Hillborg

2011

IEEE Trans. Dielect. Electr. Insul.

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On the way of making efforts to standardize the selection of polymeric materials for high voltage outdoor environments, the resistance to corona and ozone has been recognized as one among twelve parameters to be evaluated within the CIGRÉ Working Group D1.14 [1]. Our previous related work reported on the evaluation of the resistance of five commercially available polymeric materials to ac corona-ozone treatment, according to the test procedure recommended by this Working Group. With the same test arrangement in use, this report focuses on comparing the influences of ac and dc corona-ozone exposures on high temperature vulcanized (HTV) silicone rubbers. For this purpose, two types of HTV materials were used, each one characterized by different resistivity levels and tensile strength. For defining the treatment conditions, the ac and dc coronas were characterized by measuring the associated discharge current as well as the power released from the electrode. The intensity of ac corona discharge was found to be higher than that of dc corona, the latter being controlled by electrostatic charging of the treated polymeric surfaces, which also resulted in significant differences of the resulting ozone concentration. Experimental investigations after the treatments concentrated on evaluating dielectric properties (e.g. surface and volume resistivities, dielectric response (DR)), mechanical properties (e.g. tensile strength and elongation at break), as well as chemical and structural analyses (e.g. X-ray photoelectron spectroscopy (XPS) and Fourier transform infrared spectroscopy (FTIR)). Results obtained from the measurements of dielectric properties indicated a strong sensitivity of surface resistivity to the treatments, though the impact of the dc corona remained less pronounced. On the other hand, the dielectric response and volume resistivity did not exhibit a high susceptibility to the exposure. No substantial differences were also found among the ac and dc corona treated samples as regards the mechanical properties. The XPS and FTIR analyses revealed proofs of surface oxidation for the samples treated by ac corona, while the samples treated by dc corona showed much less tendency for oxidation.

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Surface degradation of styrene acrylonitrile exposed to corona discharge

Cited by 12 publications

References 38 publications

Effect of Ultraviolet Radiations on Medium and High Voltage Cables Insulation Properties

Effect of Ultraviolet Radiations on Medium and High Voltage Cables Insulation Properties

Influence of empty space and internal stresses on dielectric strength in two-phase polymer

AC and DC zone-induced ageing of HTV silicone rubber

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