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This work describes the influence of the concentration and type of peroxides on cure efficiency of various types of EPDMs (ethylene propylene diene monomer (M-class) rubber), [1][2][10]) with the various content of ethylene characterized by a wide range of applications. Rheology characteristics was investigated using the Monsanto Rheometer in the temperature range between 180 and 200 °C, with the data provided every 10 °C. Mechanical properties (tensile strenght and elongation at break) was investigated using tensile tests according to standard ASTM D-412. The obtained results showed that peroxide (2.5-Dimethyl-2.5-Di (tert-butylperoxy) hexane (DTBPH) with the concentration of 7.5 phr (cure time 1.5 min) had a higher performance at the temperatures of 180 to 190 °C. At the higher peroxide level, there is the increase in the amount of residual peroxide, as well as the possibility of the formation of clusters due to the nonhomogeneous distribution of crosslinks. Peroxide cured EPDM with 45 wt% of the ethylene content gives the most effective mechanical properties for medium voltage cables. It is to be noted that t 100 for Dicumyl peroxide (DCP), Di (tert-butylperoxyisopropyl) benzene (DTBPIB), and (2.5-Dimethyl-2.5-Di (tert-butylperoxy) hexane (DTBPH) accounts for an average of 2 to 3 half-lives.

The effect of organic peroxides on the curing behavior of EPDM isolation medium voltage cables