Ethylene-propylene-diene terpolymer peroxide-curing

The curing process was analyzed by means of a rheometry test. The rheograms of ethylene-propylene-diene composites show that the maximum for a sample of sul-fonated ethylene-propylene-norbomene was three times higher than that for virgin ethylene-propylene-norbomene terpolymer. This result suggests that the incorporation of sulfonate groups onto the carbon nanotube surface reduces the cross-limiting efficiency of the benzoyl peroxide catalyst used in the preparation. 

EPDM is a terpolymer of ethylene, propylene, and a small amount (<10%) of an unsaturated diene third monomer to provide a cure site. Unlike the elastomers previously discussed, the unsaturation in EPDM is not in the main chain, but it is pendent to the chain. Peroxide cure gives superior aging resistance and low compression set. 

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