The aim of the research was to obtain rubber composites based on SBR, NBR and EPDM and montmorillonite intercalated with ammonium cations having long alkyl chains (Cloisite^®10A and 15A) and to study the influence on vulcanizates properties. To further improve dispersion of organoclay in EPDM compounds blend of EPDM and maleic anhydride grafted EPDM-M was applied. Additionally the intercalated organoclays were modified with oleic acid. The best reinforcement by the intercalated montmorillonites was obtained in NBR and EPDM/EPDM-M (85/15) compounds. Modification of the intercalated montmorillonites with oleic acid also improved their dispersion in SBR and EPDM compounds and increased level of reinforcement.

Results: Because of better dispersion of organoclays in polar rubber NBR the achieved level of reinforcement was higher than for non-polar rubbers SBR and EPDM. To improve dispersion of organoclays in non-polar rubbers SBR and EPDM and increase level of reinforcement compatibilizers should be used. The good compatibilizer for EPDM compounds is maleic anhydride grafted EPDM (less than 2% of maleic anhydride). Improvement of organoclay dispersion in SBR and EPDM compounds can also be achieved by additional modification of organoclay with oleic acid.

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