Thermal oxidative stabilization of radiation‐crosslinked polyethylene‐ethylene propylene rubber blends

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Abstract
The influence of co‐ and termonomers on the thermal‐oxidative stability of radiation‐crosslinked stabilized polyethylene‐ethylene propylene rubber (PE/EPR) blends is discussed. For these investigations the selected criteria were the induction period in the oxygen‐uptake test and the resulting mechanical properties after oven‐aging at 135°C.From the experiments it has been concluded that the addition of only a small portion of EPR containing 5% dicyclopentadiene (DCP) as termonomer greatly reduces the protection against aging as compared to low density polyethylene. The protection against aging for those blends containing the tercomponent 5‐ethylidene‐2‐norbornene (EN) was found to be (up to a ratio of 80% EPDM (EN)) above the values obtained for PE/EPM blends. In this connection the influence of the polymeric antioxidant 2,2,4‐trimethyl‐1,2‐dihydroquinoline on the degree of crosslinking will be considered.

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