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Polímeros

versão impressa ISSN 0104-1428versão On-line ISSN 1678-5169

Resumo

PASSADOR, Fábio R.; PESSAN, Luiz A.  e  RODOLFO JR., Antonio. PVC/NBR blends by reactive processing II: physical-mechanical and morphological characterization. Polímeros [online]. 2008, vol.18, n.2, pp.87-91. ISSN 0104-1428.  https://doi.org/10.1590/S0104-14282008000200004.

Dynamic vulcanization is a process of vulcanization of an elastomer during melt mixing with a thermoplastic. This process increases the mechanical resistance of elastomers through the increase of elastic modulus, hardness and abrasion/fatigue resistance. In this study, it was evaluated the physical-mechanical and morphological behaviors of the PVC/NBR blends obtained by reactive processing. The dynamic vulcanized blends have a better performance compared to the similar conventional ones. It was observed an increase of 205% in the elastic modulus to the dynamic vulcanized blend PVC/NBR (90/10) compared with the conventional blends. The morphology of the blends examined by scanning electron microscopy evidenced the crosslinking formation only in the elastomeric phase. The vulcanized rubber particles are responsible by the increase of stiffness and consequently displayed better mechanical properties.

Palavras-chave : Dynamic vulcanization; poly (vinyl chloride); nitrile rubber; reactive processing; PVC/NBR blends; physical-mechanical properties.

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