Fire behavior of polymeric materials

Tewarson, A.

doi:10.1109/57.55286

Cited by 4 publications

(3 citation statements)

References 8 publications

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“…Permittivity ( e ' ) and loss factor (e") of different EVA-EPDM blends at ambient temperature (30°C) Figure 7 Permittivity and dielectric loss factor of different EVA-EPDM blend compositions at ambient temperature. .-…”

Section: Electrical Propertiesmentioning

confidence: 99%

EVA–EPDM blends as cable insulant

Ray

Khastgir

1994

J of Applied Polymer Sci

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SYNOPSISBase materials for heat-resistant cable insulant have been developed from blends of ethylene vinyl acetate (EVA) copolymer containing 28% VA and ethylene propylene diene (EPDM) rubber. Different electrical, mechanical, and thermal properties of these blends have been studied extensively. Aging under different conditions has also been studied. The chemical and mechanical stability of these compositions has been assessed at the actual temperature range of application. Dielectric properties have been determined against varying temperature. These blends may be used as insulating materials having a temperature rating around 90-130°C, which is above the temperature rating ( 85-9OoC) of heat-resistant insulation based on EPDM.

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Section: Electrical Propertiesmentioning

confidence: 99%

EVA–EPDM blends as cable insulant

Ray

Khastgir

1994

J of Applied Polymer Sci

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“…Zhang Yinxi et al investigated PVC/ EPDM blends compatibilized by NBR-18 and reported that the blends exhibited excellent electrical insulation properties (7) . The selection of polymeric insulating materials for cable application depends upon number of factors including good mechanical, electrical and weather resistance behavior (8)(9)(10)(11)(12)(13) . Gartasegna et al developed a product for low voltage and medium voltage cable insulation using vinyltrimethoxysilane grafted and moisture cross-linked ethylene-propylene co-polymer and ethylene-propylene-diene terpolymer and characterized (14) .…”

Section: Introductionmentioning

confidence: 99%

Studies on Comparison of Electrical Properties of Nanoclay Reinforced EPDM-g-TMEVS/PS and EPDM-g-TMEVS/PMMA Blends

Ramar¹,

Alagar

2008

Progress in Rubber, Plastics and Recycling Technology

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A novel graft copolymer of tris(2-methoxyethoxy) vinylsilane grafted ethylenepropylene-diene terpolymer (EPDM-g-TMEVS) has been developed by grafting of tris(2-methoxyethoxy) vinylsilane (TMEVS) onto EPDM using dicumyl peroxide (DCP) as radical initiator in a twin screw extruder. The linear polystyrene and polymethylmethacrylate blends based on EPDM-g-TMEVS have been synthesized with varying weight percentages of polystyrene (PS) and polymethylmethacrylate (PMMA) by melt mixing in a twin-screw extruder. The dynamically vulcanized and nanoclay reinforced blends of EPDM-g-TMEVS/PS and EPDM-g-TMEVS/ PMMA were developed by using DCP and organically modifi ed montmorillonite clay in a twin-screw extruder. The linear, dynamically vulcanized and nanoclay reinforced EPDM-g-TMEVS/PS and EPDM-g-TMEVS/PMMA blends have been characterized by different experimental studies to assess their suitability for cable insulation applications. The effect of incorporation of TMEVS grafted EPDM on electrical properties such as volume resistivity, surface resistivity, arc resistance and dielectric strength of EPDM-g-TMEVS/PS and EPDM-g-TMEVS/ PMMA blends have been studied. The values of volume resistivity, surface resistivity, arc resistance and dielectric strength are increased with increasing percentage concentration of EPDM-g-TMEVS due to the presence of-Si-O-Silinkages. The blends fi lled with nanoclay exhibit improved electrical properties due to the presence of inorganic moiety, which in turn enhance the insulation behavior. However, among the hybrid polystyrene and polymethylmethacrylate thermoplastic blends studied in the present investigation, EPDM-g-TMEVS/PS blends possess better insulating behavior than that of EPDM-g-TMEVS/PMMA blends due to thermally stable-Si-O-Si-linkages, hydrophobic and non-polar

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“…[1][2][3] Different thermal and electrical testing techniques are applied for quality checkup for cable materials. [4][5][6] Cables for special applications areas such as resistance to oil, resistance to flame and fire requires specific characteristics. 7,8 Gartasegna 9 developed low-voltage and mediumvoltage cable insulant products using vinyltrimethoxysilane (VTMO) grafted and moisture crosslinked ethylene-propylene copolymer (EPR) and ethylenepropylene-diene terpolymer (EPDM) and charecterised.…”

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confidence: 99%

Studies on Electrical and Thermal Properties of Vinyloxyaminosilane Grafted Ethylene–Propylene–Diene Terpolymer/Linear Low Density Polyethylene Blends for Cable Applications

Alagar

Kumar

Prabu

2003

Polym J

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ABSTRACT:A new terpolymer of vinyloxyaminosilane (VOS) grafted onto ethylene-propylene-diene terpolymer (EPDM) has been synthesised in a Haake Rheocord-90, torque rheometer. Vinyloxyaminosilane grafted ethylenepropylene-diene terpolymer/linear low density polyethylene (EPDM-g-VOS/LLDPE) blends with different compositions were prepared using a two roll mixing mill. The electrical properties such as surface and volume resistivities, dielectric strength and arc resistance are decreased and dielectric constant and dielectric loss are increased with increasing percentage composition of LLDPE in EPDM-g-VOS/LLDPE blends due to enhanced crosslink density. The incorporation of VOS moiety onto EPDM improves the inception decomposition and final decomposition temperatures due to stable three dimensional network and high bond energy of -Si-O-Si-linkage. The values of T g are increased with increasing concentration of LLDPE in the EPDM-g-VOS/LLDPE blends due to enhanced crystallinity and crosslink density. Thermal aging studies on mechanical properties show that the tensile strength, elongation at break and Young modulus are decreased due to disruption of crosslinking at LLDPE sites.KEY WORDS Vinyloxyaminosilane grafted Ethylene-Propylene-Diene Terpolymer/Linear Low Density Polyethylene (EPDM-g-VOS/LLDPE) Blends / Dielectric Strength / Arc Resistance / Dielectric Constant / Inception Decomposition / Thermal Ageing / Synthetic polymers find number of applications in the field of electrical insulation, as molded components and as extruded cables. Crosslinking of thermoplastic polymers with organic and/or other curing agents leads to a three dimensional network structure having adequate thermal endurance properties coupled with good dielectric and mechanical properties. A good combination of flexibility and strength is an essential requirement of cable insulant. A continuous effort is being made to improve mechanical and thermal endurance properties of cable insulant without significant loss of dielectric characteristics. The advent of a newer technique, involving the grafting of silanes onto the polymer chain followed by its subsequent condensation reaction in the presence of moisture and catalyst is more attractive due to various advantages. The service life of cable insulant materials suffers from thermooxidative aging and degradation. Thermal stability of these polymers depends upon the type and nature of cross-link system.The selection of polymeric insulating material for cable application depends upon various factors. 1-3 Different thermal and electrical testing techniques are applied for quality checkup for cable materials. [4][5][6] Cables for special applications areas such as resistance to oil, resistance to flame and fire requires specific characteristics. 7,8 Gartasegna 9 developed low-voltage and mediumvoltage cable insulant products using vinyltrimethoxysilane (VTMO) grafted and moisture crosslinked ethylene-propylene copolymer (EPR) and ethylenepropylene-diene terpolymer (EPDM) and charecterised. Tanida et al. 10...

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Fire behavior of polymeric materials

Cited by 4 publications

References 8 publications

EVA–EPDM blends as cable insulant

EVA–EPDM blends as cable insulant

Studies on Comparison of Electrical Properties of Nanoclay Reinforced EPDM-g-TMEVS/PS and EPDM-g-TMEVS/PMMA Blends

Studies on Electrical and Thermal Properties of Vinyloxyaminosilane Grafted Ethylene–Propylene–Diene Terpolymer/Linear Low Density Polyethylene Blends for Cable Applications

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