Dielectric properties of flame resistant EPDM composites

Canaud, Cristine; Visconte, Leila L. Y.; Sens, M.A.; Nunes, Regina C. R.

doi:10.1016/s0141-3910(00)00124-5

Cited by 39 publications

(37 citation statements)

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“…Power frequency determination of relative permittivity and dielectric loss through dielectric spectroscopy measurement is a fundamental study which is important in understanding underlying mechanisms relating to electrical insulating materials. Permittivity or dielectric constant measures the ability of material to store charge and the absolute values for this property should be as low as possible for a material to be considered as electrical insulator . Permittivity represents the ability of the material to be polarized by an electric field.…”

Section: Properties Of Nanocomposites For High Voltage Insulatormentioning

confidence: 99%

“…In relation with permittivity, the loss tangent is a measure of the dielectric loss that occurs due to the dielectric relaxation, in consequence of a delay in the dipole orientation with the applied field. The variation of loss tangent with frequency is due to the reduction of the permittivity as the frequency increases and is directly related to a higher or lower easiness the dipoles have to align themselves with the alternate field . The manner in which the permittivity and the loss factor change with the frequency is illustrated in Fig.…”

Section: Properties Of Nanocomposites For High Voltage Insulatormentioning

confidence: 99%

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A review of thermoplastic elastomeric nanocomposites for high voltage insulation applications

Ismail

Mariatti

2018

Polymer Engineering & Sci

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Thermoplastic elastomer (TPE) has gained acceptance as third generation of polymeric materials for high voltage (HV) insulators. The interesting features showed by TPEs were found to fulfill some particular requirements for HV insulations, at least for the distribution class applications, especially at light contamination environments. Introduction of nanomaterials which widely reported to give significant improvements in the electrical, mechanical, thermal and other properties of polymer has attracted attention to the synergistic properties of combining the two complementary technologies of thermoplastic elastomers and nanocomposites. In this paper, research works on various types of TPEs having promising performance as HV insulators are thoroughly reviewed. The emergence of nanocomposites in the electrical insulation field and the important properties consideration for HV insulators as well as the processing techniques of TPE nanocomposites are also discussed. Finally, some of the past and recent developments of TPE nanocomposites focusing on the electrical insulation properties are highlighted in this article. POLYM. ENG. SCI., 58:E36–E63, 2018. © 2018 Society of Plastics Engineers

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Section: Properties Of Nanocomposites For High Voltage Insulatormentioning

confidence: 99%

Section: Properties Of Nanocomposites For High Voltage Insulatormentioning

confidence: 99%

A review of thermoplastic elastomeric nanocomposites for high voltage insulation applications

Ismail

Mariatti

2018

Polymer Engineering & Sci

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“…EPDM is a saturated polyolefin that is used in many applications because of its ability to accommodate high amount of fillers. Due to the nonpolar hydrocarbon nature of polymers, EPDM shows excellent water resistance (Salamone, 1996;Canaud et al, 2000;Noordermeer, 2002). However, incorporating polar organophilic fillers such as clay, and dispersing silicate layers in the EPDM matrix is considered a hard practice.…”

Section: Introductionmentioning

confidence: 99%

Investigating Thermal Stability and Flame Retardant Properties of Synthesized Halloysite Nanotubes (HNT)/Ethylene Propylene Diene Monomer (EPDM) Nanocomposites

Azarmgin

Kaffashi

Davachi

2015

International Polymer Processing

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In this work, Halloysite Nanotube (HNT) was synthesized, using a modified method, from kaolin clay. The scanning electron microscopy (SEM) of the synthesized HNT revealed that many of the nanotubes were tubular; however, spherical and semi-spherical, platy and semi rolled structures were also observed. Fire retardant EPDM compounds composed of typical flame retardants (FR), deca-bromo diphenyl oxide (DBDPO), antimony oxide (Sb 2 O 3 ), talc and carbon black were prepared. Three elastomer compounds, with 5, 10 and 20 wt.% of synthesized HNT, and one more compound with 10 wt.% of synthesized HNT and 10 wt.% of conventional flame retardants were prepared and formed by a two roll mill. A TEM micrograph was presented to prove the well dispersion of HNT in polymer matrix. The flammability, thermal stability and tensile strength of the compounds were compared to that of typical fire retarded EPDM. The results showed that the typical flame retardants diminish the tensile strength and elongation at break of EPDM elastomers; in addition, these compounds showed the lowest thermal stability among the typical formulations. The extent of flammability of the compounds was characterized using the cone calorimetry technique. The compound containing 5 wt.% HNT showed the highest tensile strength, the least flammability and the highest thermal stability compared to the other compounds. This was related to the good dispersion and also on the tubular structure of the synthesized nanotubes. The peak of heat release rate (PHRR) and total heat release (THR) as well as the amount of hazardous gas emission for the sample having the highest mechanical response was smaller than those with conventional micro-filler flame retardants.

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“…[7][8][9][10][11] In order to get the effective flame retardancy, the ATH must be added into the material with a sufficient amount (>50 wt %), and this could cause decrease in some of the physical and mechanical properties of the composites. 7,8 The addition of the nanoclay into polymers has been identified that the composite can increase in some extent of thermal stability, flame retardancy, mechanical property, and the capability of smoke suppression.…”

Section: Introductionmentioning

confidence: 99%

Synergistic effect of aluminum hydroxide and nanoclay on flame retardancy and mechanical properties of EPDM composites

Yen

Wang

Guo

2013

J of Applied Polymer Sci

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ABSTRACT:The composites based on ethylene-propylene-diene monomer rubber (EPDM) with aluminum hydroxide (ATH), nanoclay, vulcanizing agent, and curing accelerator were prepared by conventional mill compounding method. The thermal stability and the flame retardant properties were evaluated by thermogravimetric analysis (TGA), limiting oxygen index (LOI), UL-94 test, cone calorimeter, and smoke density chamber tests. The results indicated that the substitution of the nanoclay in the EPDM/ATH composites increased the 50% weight loss temperature and the LOI value, and reduced the peak heat release rate (pk-HRR), the extinction coefficient (Ext Coef), the maximal smoke density (Dm), and the whole smoke at the first 4 min (VOF4) of the test specimens. The synergistic flame retardancy of the nanoclay with ATH in EPDM matrix could imply that the formation of a reinforced char/nanoclay layer during combustion prevents the diffusion of the oxygen and the decomposed organic volatiles in the flame. The mechanical properties of the composites have been increased by replacing more of the nanoclays into the EPDM/ATH blends. The best loading of the nanoclay in EPDM/ATH composites is 3 wt %, which keeps LOI in the enough value, the V-0 rating in the UL-94 test, and the improved mechanical properties with better dispersion and exfoliation of the nanoclays shown by transmission electron microscopy (TEM) micrographs.

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Dielectric properties of flame resistant EPDM composites

Cited by 39 publications

References 1 publication

A review of thermoplastic elastomeric nanocomposites for high voltage insulation applications

A review of thermoplastic elastomeric nanocomposites for high voltage insulation applications

Investigating Thermal Stability and Flame Retardant Properties of Synthesized Halloysite Nanotubes (HNT)/Ethylene Propylene Diene Monomer (EPDM) Nanocomposites

Synergistic effect of aluminum hydroxide and nanoclay on flame retardancy and mechanical properties of EPDM composites

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