Preparation and properties of epoxidized natural rubber modified graphene-carbon black/natural rubber composites

The epoxidized natural rubber(ENR) was an interfacial modifier for the preparation of graphene-carbon black/natural rubber-ENR(GR-CB/NR-ENR) composites. The effects of ENR dosage on the processing properties, mechanical properties and dynamic mechanical properties of GR-CB/NR-ENR composites were studied. The results show that the addition of ENR can improve the processing properties of GR-CB/NR-ENR composites and the dispersion of CB particles in NR matrix. Increasing the compatibility of GR with NR, the interfacial compatibility between the filler and the NR matrix is enhanced, the dynamic mechanical properties, physical properties and aging resistance are improved. When 6 wt% ENR is added, the GR-CB/NR-ENR composite has the highest tear strength and tensile strength, and the GR-CB/NR-ENR vulcanized rubber has the best aging resistance. As the ENR content increases, the compression fatigue temperature of the GR-CB/NR-ENR composite increases first and then decreases; As the strain increases, the storage modulus G' of the GR-CB/NR-ENR composite decreases continuously, and the loss factor tanδ shows a phenomenon of increasing first and then decreasing, while the dynamic modulus drops sharply with increasing strain.