Resumo

SOARES, Bluma G.  e  OLIVEIRA, Paulo J. de. Effect of the compatibilization of NBR/EVA blends on co-continuous morphology. Polímeros [online]. 2003, vol.13, n.1, pp.28-35. ISSN 1678-5169.  http://dx.doi.org/10.1590/S0104-14282003000100008.

The influence of ethylene-vinyl acetate copolymer functionalized with mercapto groups (EVALSH) on rheological, morphological and dynamic mechanical properties of nitrilic rubber (NBR)/ ethylene - vinyl acetate copolymer (EVA) blends has been investigated. Selective extraction experiments of NBR phase and scanning electron micrography suggest that co-continuous morphologies were formed in a range of blend compositions from 30 to 60 wt% of EVA. The addition of EVALSH did not affect the co-continuous range but shifted the percolation threshold of NBR-richer blends towards lower amount of EVA. The co-continuous range was also evidenced by dynamic mechanical analysis. Rheological data also revealed that the presence of EVALSH increased the viscosity of the blends containing higher amounts of NBR.

Palavras-chave : NBR; EVA; compatibilization; co-continuity; DMTA; rheology.

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