AbstractThe structure and properties of dynamically cured ethylene‐propylene‐diene terpolymer (EPDM) and ionomer blends have been studied. The blends were prepared in a laboratory internal mixer, where EPDM was cured under shear in the presence of ionomer with dicumyl peroxide (DCP) under different shear conditions. The effects of EPDM/ionomer compositions, DCP concentration and the intensity of shear mixing were investigated using capillary rheometer, differential scanning calorimeter (DSC) and scanning electron microscopy (SEM) techniques. Two kinds of poly(ethylene‐co‐methacrylic acid) ionomers containing different metal ions(Na+and Zn++) were compared and the effect of the metal ion type for neutralization was considered. The Zn‐neutralized ionomer showed better miscibility with EPDM than the Na‐neutralized ionomer. It is concluded from the rheological properties, crystallization behavior and morphology that the dynamically cured EPDM and Zn‐ion ionomer blends show the behavior of a thermoplastic interpenetrating polymer
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