EVA–EPDM blends as cable insulant

Ray, Indrajit; Khastgir, Dipak

doi:10.1002/app.1994.070530306

Cited by 15 publications

(13 citation statements)

References 9 publications

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“…Detailed studies on the relationship between morphology of LDPE/EVA blends and their mechanical properties, dynamic mechanical properties and electrical resistance have been reported. [21][22][23][24][25][26] Ray and Khastgir [22] found that an interpenetrating polymer network-like structure was formed in LDPE/EVA blends with a minimum content of 50 wt.-% EVA. Up to now no information has been reported on the ESCR behavior of LDPE/EVA blends.…”

Section: Resultsmentioning

confidence: 99%

Environmental Stress‐Cracking Resistance of LDPE/EVA Blends

Borisova

Kreßler

2003

Macro Materials & Eng

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Blends of low‐density polyethylene with random copolymers of ethylene and vinyl acetate (PE/EVA) are studied with respect to their environmental stress‐cracking resistance (ESCR) using the Bell‐telephone test. This system shows the shortest time to failure in the ESCR test after annealing at 50 °C in a stress‐cracking agent (Igepal solution) compared with that in the tests conducted at 30 and 70 °C. The increase of the time to failure at 70 °C as compared with that at 50 °C is probably the result of the semicrystalline proportion of EVA melting. Transmission electron microscopy images (see Figure) reveal that EVA particles are molten and deformed in bending direction of the sample at 70 °C in contrast to samples annealed at 50 and 30 °C. TEM pictures of a failed sample during the test conducted at 50 °C indicate that EVA particles can stop crack propagation.TEM image of PE/EVA‐5.4 after 1 000 h in ESCR test conditions at 70 °C.magnified imageTEM image of PE/EVA‐5.4 after 1 000 h in ESCR test conditions at 70 °C.

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Section: Resultsmentioning

confidence: 99%

Environmental Stress‐Cracking Resistance of LDPE/EVA Blends

Borisova

Kreßler

2003

Macro Materials & Eng

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“…1 Blend (EVA/EPDM) had partial miscibility in the amorphous region. 2 Dicumyl peroxide (DCP) was used as an initiator in cross-linking EVA/EPDM over the entire range of composition. 3 Consequently, miscibility and mechanical properties of EVA/EPDM were improved.…”

Section: Introductionmentioning

confidence: 99%

Kinetic study on cross‐linking and blowing behavior of EVA/EPDM/CPE high elasticity material

Liu

Lin

2007

J of Applied Polymer Sci

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Blend of ethylene-vinyl acetate copolymer (EVA), ethylene-propylene-diene terpolymer rubber (EPDM), and chlorinated polyethylene (CPE) filled with talc was cross-linked with dicumyl peroxide and blown simultaneously with azodicarbonamide for preparation of high elasticity material by injecting, cross-linking, and blowing process. It had excellent mechanical properties and elasticity. It was found that mechanical properties were a function of cross-linking and blowing temperature and time and formula. A good cross-linking and blowing temperature was in the range of 440-450 K and the optimum temperature and time were 448 K and 360 s, respectively. Kinetics of both cross-linking and blowing reactions were investigated by closed nonrotor torque rheometer. The results showed that both cross-linking and blowing reactions were first order. The activation energy of the cross-linking reaction was higher than that of the blowing reaction. With increasing of EDPM content, the activation energy of the crosslinking reaction reduced whereas it increased for the blowing reaction. The gas cell morphology was characterized by scanning electron microscopy (SEM). The results of SEM and mechanical property analyses showed that the morphology and mechanical properties were improved by incorporating CPE.

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“…4,5 Earlier studies on accelerated ageing of rubber vulcanizates show that the properties such as elongation at break, tensile strength, and modulus undergo changes due to deterioration. 6 It is well known that for many unsaturated rubbers, the hydrogen atom of a-methylenic carbon is abstracted in the presence of oxygen and an oxidative reaction chain is initiated which propagates auto-catalytically and ends in chain scission. Besides scission of the main chain and of the cross-links, depending upon polymers, ageing causes the formation of more cross-links of the same type as those already present or of a different type, which may be inactive to further scission.…”

Section: Introductionmentioning

confidence: 99%

Ageing studies of ethylene propylene diene monomer rubber/styrene butadiene rubber blends: Effects of heat, ozone, gamma radiation, and water

Nair

Kumaran

Unnikrishnan

et al. 2007

J of Applied Polymer Sci

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ABSTRACT:The ageing behavior due to the effects of heat, ozone, g-radiation, and water on ethylene propylene diene monomer rubber/styrene butadiene rubber (EPDM/ SBR) blends was studied. The tensile strength, crack initiation, ozone ageing, gamma radiation, and water resistance of the blends were measured and used to determine the extent of ageing. Tensile strength of blends of different compositions increased after thermal ageing for 96 h at 1008C probably due to the continued cross-linking. It has been observed that an increase in EPDM in the blends improves the ozone resistance of the blends. Crack initiation was noted only in blends with lesser amount of EPDM and the cracks in such blends were found deeper, wider and continuous. With 15 kGy irradiation dose, the tensile strength of the blends found to be decreased while it increased with 80 kGy dosage of g-radiation. The elongation at break showed a decreasing trend with increased dosage of g-radiation. It has also been observed that the EPDM rich blends showed negligible water uptake.

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EVA–EPDM blends as cable insulant

Cited by 15 publications

References 9 publications

Environmental Stress‐Cracking Resistance of LDPE/EVA Blends

Environmental Stress‐Cracking Resistance of LDPE/EVA Blends

Kinetic study on cross‐linking and blowing behavior of EVA/EPDM/CPE high elasticity material

Ageing studies of ethylene propylene diene monomer rubber/styrene butadiene rubber blends: Effects of heat, ozone, gamma radiation, and water

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