Influences of porous reduction graphene oxide/molybdenum disulfide as filler on dielectric properties, thermal stability, and mechanical properties of natural rubber

A ternary composite system consisting of natural rubber (NR), porous reduced graphene oxide (rPGO), and molybdenum disulfide (MoS2) was introduced for applying in the dielectric field, of which rPGO and MoS2 hybrid conductive filler (rPGM) was prepared by an effective and environmentally friendly method-microwave reduction. And the well-dispersed NR composites (NGM) were made by the latex co-precipitation method. Due to the large specific surface area of rPGM itself and the synergistic dispersion of rPGO and MoS2, it formed many stable interface structures with the NR matrix, which not only made the blend exhibit high elasticity and withstood large deformation as NR but also greatly improved the dielectric, mechanical and thermal stability of the NR matrix. Compared with neat NR, the dielectric constant of nanocomposite increased by 11 times in the presence of rPGM conductive filler, and the leakage current generated by direct contact of fillers was reduced due to the attachment of MoS2 to the surface of rPGO; when 2% rPGM was added, the NR exhibited the highest tensile strength (21.3 MPa), elongation at break (495%), and abrasion resistance (0.165 cm(-3)); in addition, the thermal stability of the nanocomposite was also improved. These phenomena indicate that rPGM had great potential in conductive fillers and provided a reliable way for NR applications in the field of dielectric elastomers.

Automated summary

A novel ternary composite system was introduced, with rPGM conductive filler prepared by microwave reduction, resulting in NR composites with high elasticity and thermal resistance. The addition of rPGM significantly improved the electrical, mechanical, and thermal stability of the NR composites.