Abstract
The reactive compatibilization of ethylene-propylene-diene (EPDM/nitrile rubber( NBR) blends was performed using mercapto-modified copolymers (mercapto-modified EPDM, EPDMSH, and mercapto-modified ethylene-vinyl acetate copolymer, EVASH) in combination with oxazoline-functionalized NBR (NBR-ox). The best mechanical performance was achieved with the two EVASH-based compatibilizing systems, especially the one containing the co-reactive copolymers because of the reactivity of the oxazoline group. The presence of insoluble material in non-vulvanized blends suggested the reactive compatibilization. The morphologies of these blends were examined through scanning electron microscopy (SEM). Blends compatibilized with the EVASH-based systems showed finer morphologies than the non-compatibilized blend or those compatibilized with the EPDMSH-based systems. In non-vulcanized NBR/EPDM (70:30 wr-%) blends, the presence of the co-reactive EVASH/NBR-ox system changes the morphology from a cocontinuous structure towards a droplet-matrix morphology, and also results in a significant broadening of the damping curve related to the NBR transition, observed from DMTA analysis. The effect of the compatibilization on aging resistance has also been evaluated.
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