Aspects of producing hydrogenated nitrile butadiene rubber (HNBR) nanocomposites by melt compounding processing

Abstract

Industry is constantly demanding for materials with differential properties that explores nanoscale fillers functionality. Unfortunately, most of the papers present processing methods that are hard to scale up. Effects in addition different amounts of multiwall carbon nanotubes (MWCNT) and few-layer graphene (FLG) on cure behaviour, viscoelastic, mechanical and electrical properties of a hydrogenated nitrile butadiene rubber (HNBR) are investigated and compared with those composites having carbon black (CB) as filler. Looking for scale up the produced nanocomposites, rubber composites were produced in a closed mixing chamber by melt mixing with unmodified fillers. Addition of nanotubes reduces curing time. Microstructural analyses indicate that FLG cannot be easily dispersed by this methodology. Significant improvement in mechanical properties is observed with MWCNT addition, with 940% modulus increment regarding to the pure polymer and also, in lower intensity, in HNBR/FLG composites. Moreover, HNBR/MWCNT composites presented a sharp reduction in electrical resistivity at low loading level.

Preparation and Properties of SBR Composites Containing Graphene Nanoplatelets Modified with Pyridinium Derivative

“…It is known that an efficient elastomer curing is fundamental to produce composites with satisfactory properties. Some authors noticed that the presence of carbon filler led to TC2 shortening, probably due to an increment in thermal conductivity in presence of those fillers that promoted fulfilment of curing [56]. Our research did not confirm this.…”

“…Several factors, e.g., concentration as well as filler dispersion within polymer have crucial meaning for the enhancement of electrical conductivity of polymer composites [63]. One of the ways to increase the electrical conductivity of elastomers is to introduce conductive fillers, for example GnPs [56]. Figure 7 shows the electric volume resistivity (ρ) of SBR composites fabricated with the use of GnPs modified during rubber mix preparation on two-roll mill or from solution.…”

Aramid pulp reinforced hydrogenated nitrile butadiene rubber composites with ionic liquid compatibilizers

“…Rubber vulcanization was carried out in a hot press at 185°C and 6 tons for 6 min, defined on the basis of the rheometric curve for pure HNBR. According to the recent literature, the t 90 of HNBR at 180 °C is 5.4 min and, with the addition of filler, its value reduces more than 50%, reaching 2.5 min. Thus, in the present work, curing was carried out for 6 min at 185 °C to ensure total curing of all materials.…”

Graphene/carbon black/natural rubber composites prepared by a wet compounding and latex mixing process

“…As a new type of materials, graphene is a prospective filler for rubber materials. It has attracted worldwide attention due to its extraordinary properties [1-6] such as: (1) high modulus of ∼1 TPa with flexibility and lightweight, and thus better mechanical reinforcement effect compared to conventional filler; (2) high electrical and thermal conductivity; (3) gas barrier properties higher than clay; (4) higher specific area, leading more interfacial contact and larger strain-induced crystallization ability compared with clay and carbon nanotubes. Therefore, graphene, as one of the most powerful 2D material, represents a good opportunity for the revolution of traditional rubber technology.…”