Effect of reduced graphene oxide, multi-walled carbon nanotubes and their mixtures on the electrical conductivity and mechanical properties of a polymer composite with a segregated structureстатья
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Аннотация:The development of new electrically conductive polymer composites is one of the most important research areas ofcomposite materials science community nowadays. This work is devoted to the preparation and study of electricallyconductive polymer composites with a segregated network structure with mixtures of reduced graphene oxide/multiwalledcarbon nanotubes (rGO/MWCNTs) in various ratios. At a fixed value of the total mass fraction of rGO/MWCNTs(1 wt.%), the set of samples with different rGO/MWCNTs ratio was obtained and examined via scanning electron microscopy,wide range dielectric spectroscopy and tested under compression. We have shown that the use of grapheneoxide in a mixture with MWCNTs makes it possible to significantly improve the uniformity of MWCNTs distributionduring the formation of a filler layer on polymer particles, which leads to an increase in the electrical conductivity of thecomposites in comparison with samples containing only rGO or MWCNTs. It was also shown adding 1 wt.% of rGO to thepolymer increases the elastic modulus by 18% compared to the pure polymer. In turn, adding of MWCNTs, there is a dropin the elastic modulus by a quarter. It was found that fillers do not affect the plastic flow initiation stress of the material,which is 21 ± 1 MPa.
