Fabrication and Characterization of Closed-Cell Rubber Foams Based on Natural Rubber/Carbon Black by One-Step Foam Processing

Abstract

A novel one-step compression molding was proposed and successfully employed for preparation of closed-cell foams based on natural rubber (NR)/carbon black (CB) composite. The uniqueness of this new method was that both the foam density and expansion ratio became independent of the CB content. The rheometrical findings indicated that the increase in the CB content from 0 to 20 phr yielded a 0.91 and 3.51 N m increase in the initial and the final torque, respectively. The SEM results demonstrated that the prepared foam had three different layers including the skin, transition, and core layers. Almost 14-fold enhancement of the cell density (from 8 to 117 cells/cm 3 ) was obtained by increasing the CB content in a constant foam density. Although, curing properties, cell morphology, and mechanical properties of the foam improved by increasing the CB content, the gradual deterioration was observed for sound absorption properties.

Effect of graphene treated with cyclohexyl diamine by diazonium reaction on cure kinetics, mechanical, thermal, and physical properties of natural rubber/graphene nanocomposite foam

“…The elongation at break of NRF/UG3 and NRF/CG3 were similar to that of unfilled NRF. Generally, the elongation at break of NRF composites decreased with increasing filler content due to the rigidity of fillers . However, in our case the addition of graphene particles does not impair the elongation at break of NRF nanocomposites, meaning that it can retain the elastic behavior of NRF product with high tensile strength.…”

“…Some fillers (e.g., calcium carbonate , kenaf powder , and rice husk powder ) can significantly improve tensile strength and compressive stress of NRF only at high filler loading. Nevertheless, some fillers such as carbon black and NRF/organoclay nanocomposites can provide high impact on the properties of NRF. The intrinsic filler factors that effect on the final properties of NRF composites include filler geometry, size and size distribution, content, compatibility, filler‐polymer interaction and the functional group of filler.…”

The Synergy of Double Cross-linking Agents on the Properties of Styrene Butadiene Rubber Foams

“…Because of these excellent properties, they have been used in many applications, including thermal and sound insulators, packaging, electromagnetic shielding materials, structural components and medical devices45. In recent years, elastic foams have been successful made from styrene butadiene rubber (SBR)6, poly(ethylene vinyl acetate) (EVA)7, poly(ethylene propylene diene) (EPDM)8, natural rubber (NR)9, polyurethane (PU)10 and polychloroprene rubber (CR)11. The literature review revealed that the rubber foams were mainly studied from two aspects: (a) their morphology, microstructure and resultant properties; (b) Physical and mechanical properties such as density, hardness, rebound resilience, compression set, tensile strength, tear strength and elongation at break.…”

Effect of carbon nanotube on PA6/ECO composites: Morphology development, rheological, and thermal properties

“…3 Since these materials are not vulcanized so they can be recycle and re-shape via a re-melting process similar a thermoplastic materials. [5][6][7] Carbon nanotubes (CNTs) are known as the ideal reinforcing fillers to produce high-performance nanocomposites with excellent mechanical, thermal, and electrical properties 8,9 compared with other fillers such as glass fiber, talc, calcium carbonate, carbon black, and carbon nanofiber. [5][6][7] Carbon nanotubes (CNTs) are known as the ideal reinforcing fillers to produce high-performance nanocomposites with excellent mechanical, thermal, and electrical properties 8,9 compared with other fillers such as glass fiber, talc, calcium carbonate, carbon black, and carbon nanofiber.…”