Electron beam curing of EVM and HNBR for cable compounds

La Rosa, M.; Hoch, M.; Wrana, C.
June 2007
Chemical Business;Jun2007, Vol. 21 Issue 6, p62
Trade Publication
Due to their profile of properties, EVM (Levapren) and HNBR (Therban) rubbers are well suited for cable applications in harsh environments. Cables used for military and navy must comply with very high requirements in terms of swelling in aggressive media (oils, ester based fluids, diesel fuel) as well as high temperature resistance and mechanical performance. The properties of the finished rubber parts are defined by the microstructure of the polymers, the type and strength of the network formed during the electron beam treatment and by the interaction of the polymer matrix with reinforcing fillers. Radiation cure is an alternative to peroxide cure and is gaining increasing importance especially in cable manufacturing. In this paper we systematically analyse the influence of radiation dosage and type and amount of coagents typically used for peroxide cure on the crosslink density of the resulting vulcanisates of HNBR and EVM. Based on our findings an optimization can be achieved through selection of the specific coagent, polymer blending ratio and radiation dosage.


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