An investigation of dynamic mechanical, thermal, and electrical properties of housing materials for outdoor polymeric insulators

Ehsani, Morteza; Borsi, H.; Gockenbach, E.; Morshedian, Jalil; Bakhshandeh, G. R.

doi:10.1016/j.eurpolymj.2004.03.014

Cited by 80 publications

(40 citation statements)

References 9 publications

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“…The obtained solution was dried at 80 °C for 6 h, and then the calcinations step was carried out at three different temperatures of 500, 600, and 800 °C for 2 h with a heating rate of 10 °C/min, resulting three powders entitled α, β, and γ-NZF, respectively. The details of this method have been explained elsewhere [32][33][34] . Extraction of NZF pigments was proceeded as described by Pouget et al 35 .…”

Section: Low Carbon Steel Panelsmentioning

confidence: 99%

Potency of ZnFe2O4 Nanoparticles as Corrosion Inhibitor for Stainless Steel; the Pigment Extract Study

et al. 2017

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The corrosion inhibition of nanoparticulates zinc ferrite (NZF) pigment was studied. The steel samples were immersed in the NZF pigment extract in 3.5 wt. % NaCl. Electrochemical tests such as electrochemical impedance spectroscopy (EIS) and polarization as well as surface analysis were employed to evaluate the effect of NZF on the steel corrosion. The concentration of Zn and Fe in the pigment extracts before and after immersion of mild steel samples was evaluated by inductively coupled plasma-optical emission spectrometry (ICP-OES). EIS results in total agreement with results of polarization test demonstrated superiority of NZF as an anticorrosion pigment. In the case of samples exposed to NZF extract, the higher resistance and lower double layer capacitance extracted from impedance spectra as well as lower current density from polarization results might be attributed to precipitation of an inhibitive layer on the surface. This was also supported by SEM/EDS and ICP-OES results.

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Section: Low Carbon Steel Panelsmentioning

confidence: 99%

Potency of ZnFe2O4 Nanoparticles as Corrosion Inhibitor for Stainless Steel; the Pigment Extract Study

et al. 2017

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“…It can be widely used in many fields [1][2][3][4][5][6][7] because its backbone is almost saturated. During outdoor applications, it is degraded by heat [8][9][10], radiation [11][12][13], chemical environment [14][15][16][17] and ozone [18,19], which can cause the loss of bulk properties such as tensile strength and elongation at fracture and result in the reduction of the service life.…”

Section: Introductionmentioning

confidence: 99%

Degradation Characterization of Ethylene-Propylene-Diene Monomer (EPDM) Rubber in Artificial Weathering Environment

Zhao

et al. 2010

J Fail. Anal. and Preven.

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Ethylene-propylene-diene monomer containing 5-ethylidene-2-norbornene as diene was exposed to artificial weathering environment produced by a xenon lamp light exposure and weathering equipment for different periods of time. The changes of surface color and mechanical properties were monitored by spectrophotometer, computer-controlled tensile testing and hardness measurements. Crosslink density of ethylene-propylenediene monomer specimens was measured by the solvent swell method. The results showed that the surface of ethylene-propylene-diene monomer became yellower due to the form of carbonyl group. The degradation process proceeded predominantly via cross-linking. With increase in crosslink density, the tensile strength increased and the elongation at fracture decreased.

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“…In outdoor high voltage applications, electrical insulation often experiences stresses that can be withstood by only a few materials. Stresses arise from multiple sources including environmental (UV, moisture, temperature, chemical), electrical (dry band arcing, partial discharge, Corona) and mechanical (cyclic loading) [1][2][3][4][5].…”

Section: Introductionmentioning

confidence: 99%

Effects of Ph<sub>12</sub>SQ on the thermal stability and mechanical properties of high temperature vulcanized (HTV) silicone rubber

Moghadam

Morshedian

Ehsani

et al. 2014

IEEE Trans. Dielect. Electr. Insul.

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Ph 12 SQ (C 6 H 5 SiO 1.5 ) 12 was blended into a polydimethylsiloxane (PDMS) based HTV silicone rubber as a reinforcing filler at loadings of (0, 2.5, 5, 10, 15, 20% by weight). The thermal stabilities and mechanical properties of these HTV silicone rubber composites were studied by thermal gravimetric analysis (TGA) and tensile testing, respectively. Dispersions of Ph 12 SQ were characterized by scanning electron microscopy (SEM). The obtained results show the presence of SQ-rich regions that affect the thermal stabilities and mechanical properties of HTV silicone rubber. TGA shows that T d1% is delayed from approximately 215 C for DD 0 to 350 C (DD 20 ) (about 130C) and the T d5% mass loss exhibits a similar trend. The thermo-oxidative stability also increases with Ph 12 SQ weight fraction. Also, the tensile strength and elongation at break of these HTV silicone rubbers increase from 8.8 to 11 MPa and 655 to 950 % with incremental loading of Ph 12 SQ to 5 wt% (DD 5 ). Moreover, the addition of Ph 12 SQ increases its relative permittivity from 3.2 to 14.2 and the dissipation factor at 1 MHz increases from 0.01 to 0.05. Finally, the values of T d5% at different heating rates were applied for comparison of the lifetime of DD 0 and DD 5 samples according to the D&R model. The results show that DD 5 offers a longer lifetime than DD 0 at different temperatures. He has advised nearly 100 M.S. and Ph.D. students with whom he has published over 200 papers and three books in structure-rheology correlation, polymer processing, and particularly reaction compounding with internal mixers and extruders for modified properties. Chemical, and radiation crosslinking of polyolefin is chief among his research work.

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An investigation of dynamic mechanical, thermal, and electrical properties of housing materials for outdoor polymeric insulators

Cited by 80 publications

References 9 publications

Potency of ZnFe2O4 Nanoparticles as Corrosion Inhibitor for Stainless Steel; the Pigment Extract Study

Potency of ZnFe2O4 Nanoparticles as Corrosion Inhibitor for Stainless Steel; the Pigment Extract Study

Degradation Characterization of Ethylene-Propylene-Diene Monomer (EPDM) Rubber in Artificial Weathering Environment

Effects of Ph<sub>12</sub>SQ on the thermal stability and mechanical properties of high temperature vulcanized (HTV) silicone rubber

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