Abstract
The article deals with research related to the issues of nanomodification of elastomers as a basis of electric heaters with self-regulating temperature. The effect of multistage mechanical activation of multilayer carbon nanotubes (MCNTs) with graphite on the uniformity of the temperature field distribution on the surface of nanomodified organosilicon elastomer has been studied. The influence of the stages of mechanical action on the parameters of MCNTs is revealed. It has been ascertained that for the MCNTs/graphite bulk material, which has passed the stage of mechanical activation in the vortex layer apparatus, a more uniform distribution of the temperature field and an increase in temperature to 57.1 °C at the supply voltage of 100 V are typical. The distribution of the temperature field in the centrifugal paddle mixer “WF-20B” for mixing MCNTs with graphite has been investigated. It has been found that there is also a thermal effect in addition to the mechanical action on the MCNTs in the paddle mixer “WF-20B”. The thermal effect is associated with the transfer of the mechanical energy of friction of the binary mixture MCNTs/graphite on the paddle and the walls of the vessel. The multiplicity of the starting current Ip to the nominal In (Ip/In) is 5 for the first sample, 7.5 for the second sample, and 10 for the third sample at the supply voltage of 100 V. The effect of reducing the starting current and stabilizing the temperature indicates the presence of self-regulation, which is expressed in maintaining a certain level of temperature.
Highlights
New polymer materials are an integral part of the development of the modern energyefficient and resource-saving industry [1]
The purpose of the work is to ascertain the effect of multistage mechanical activation on the percolation of the electrical conductivity of a composite based on organosilicon elastomers and multilayer carbon nanotubes (MCNTs) mixed with graphite, as well as to study the uniformity of the heat release during the electric current flow
The second stage in the vortex layer apparatus provides an increase in the bulk density from 46.1 to 370.4 kg/m3, which is associated with high-energy mechanical action and intensive mechanical grinding of MCNTs
Summary
New polymer materials are an integral part of the development of the modern energyefficient and resource-saving industry [1]. Various approaches are used to obtain new materials. The most efficient approach is the synthesis of nanomaterials. Carbon nanostructures are of great importance among various types of nanomaterials [2,3]. The technology of obtaining nanomodified materials is one of the topical areas of research in the field of modern materials science. Nanomodification or nanostructuring opens up new horizons for the use of composite materials based on elastomers, thermoplastics, and thermosets, which will increase their resistance to both mechanical stress [4,5] and erosive wear [6,7]
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