Composites of ethylene – propylene, acrylonitrile – butadiene with micro size Fe₃O₄, Fe₂O₃ and nano size Fe₃O₄ as the fillers were tested. Iron oxides were found to be active fillers which improved mechanical properties of elastomers. Additionally, they also changed their magnetic properties. Moreover, a chemical modification of the surface of micro size Fe₃O₄ was done, in order to upgrade mechanical properties of the vulcanizates. Itaconic acid, methacryloxypropyltrimethoxy silane and monododecyl maleate were used as the modifiers. To improve dispersion in polymers matrix, non-ionic (NF-PEG), anionic (calcium stearate), cationic (DTAB, DTAC, DDAB, CTAB) and ionic liquids (HMIMBF₄, BMIMPF₆, OMIMPF₆) as the dispersing agents were tested. It was observed that non-modified and modified micro iron oxides and non-modified nano iron oxides showed better properties of tested vulcanizates.

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