ABSTRACT:A systematic electrical and mechanical study was carried out on styrene butadiene rubber (SBR), as a nonpolar rubber, and nitrile rubber (NBR), as a polar one blended with pure and waste polyethylene (PE), low and high density. The compatibility investigations, which were carried out by the dielectric method and confirmed by the calculated heat of mixing, indicate that SBR-PE blends (either low or high density) are compatible, while NBR-PE blends are incompatible. From the electrical and mechanical results, it is found that the addition of waste PE to either polar or nonpolar rubber leads to better electrical and mechanical properties when compared with those for the blends having pure PE. The values of permittivity 1 are found to increase pronouncely, while the values of dielectric loss 1Љ slightly decrease. Shore hardness was also measured for all the investigated systems and found to vary linearly with the permittivity 1.

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The permittivity Ј and dielectric loss Љ for different ratios of an ethylene propylene diene monomer (EPDM)-chloroprene rubber (CR) blend ranging from 0 to 100 phr were measured over a frequency range from 400 Hz to 60 kHz. The measurements were carried out at room temperature (25°C). The values of Ј and Љ were found to decrease with increasing EPDM content in the EPDM-CR blend. The sample which possesses the best mechanical and electrical properties was a 50 EPDM-50 CR blend. This sample was chosen to be loaded with 40 phr of some white fillers, namely, calcium carbonate, silica, silitan z, and talc. From the electrical and mechanical investigations, it was found that the use of silica and calcium carbonate in these blends could improve these properties. The electrical and mechanical properties were also studied for the investigated blends loaded with both silica and calcium carbonate with different contents

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