Abstract
Mixed fillers composed of functionalized graphene (f-G) and functionalized multi-walled carbon nanotubes (f-CNTs) (f-G-f-CNTs) were prepared and their synergistic effects in terms of enhancing the electrical conductivity and tensile modulus of poly(ether sulfone) (PES) composites were investigated. The results indicate that the electrical conductivity of the 5wt% f-G-f-CNTs(Wf-G/Wf-CNTs=1:1)/PES composite was 2.2 times higher than that of the 5wt% f-G/PES composite and 8.9 times higher than that of the 5wt% f-CNTs/PES composite. Moreover, the tensile modulus of the 5wt% f-G-f-CNTs(Wf-G/Wf-CNTs=1:1)/PES composite relative to that of the 5wt% f-G/PES composite and 5wt% f-CNTs/PES composite increased by 16.5% and 50.6%, respectively. Additionally, enhancements in the electrical conductivity and tensile modulus of the PES composite depended on the weight ratio of f-G and f-CNTs in the mixed fillers. The electrical conductivity and tensile modulus exhibited maximum values when the weight ratios of f-G and f-CNTs were 1:3 and 1:1, respectively. When the weight ratio of f-G and f-CNTs was fixed at 1:1, the f-G-f-CNTs(Wf-G/Wf-CNTs=1:1)/PES composite showed a percolation threshold of 0.22vol%, much lower than that of the f-G/PES composite.
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