"Effect of composite reinforcing agents on the properties of HNBR/FKM composites"

Abstract

HNBR/FKM composites were prepared by compounding carbon black (CB), hydroxide zinc monomethacrylate (HZMMA) and carbon nanotubes (CNTs) to modify hydrogenated nitrile rubber (HNBR)/ fluororubber (FKM) blend, and the effects of the composite reinforcing agent on the curing characteristics of HNBR/FKM blends, and the physico-mechanical properties, dynamic mechanical properties and thermal-oxydative aging properties of the vulcanized rubber were investigated. The results showed that the curing rate of HNBR/FKM compo-sites was accelerated and the cross-linking degree was increased when HZMMA and CNTs were added, and the physico-mechanical properties of HNBR/FKM composites were significantly improved under the synergistic effect of HZMMA and CNTs. HNBR/FKM composites reinforced by HZMMA and CNTs of 3 phr (mass) exhibited the highest retention rate of elongation at break and the lowest change rate of hardness after thermal-oxydative aging compared with that reinforced by pure CB. As the addition amount of CNTs increased, the glass transition temperature of HNBR/FKM composites moved towards the lower temperature and the loss factor decreased gradually.

Keywords

• composite reinforcing agent
• hydrogenated nitrile rubber
• fluororubber
• composite
• physico-mechanical properties
• dynamic mechanical property
• thermal-oxydative aging property