The paper discusses scientific publications regarding polymer composites based on epoxy resins, which are the main competitor of many traditional structural materials. The review on carbon nanofillers for composite materials, such as graphene, graphene oxide, carbon nanotubes, etc., is given. Methods for introducing these nanomaterials into different binders are considered, and comparative results of improving the strength characteristics of nanocomposites are presented.
Multi-walled carbon nanotubes (CNTs) were used to reduce the electrical resistivity (i.e., increase the conductivity) of industrial epoxy. Samples loaded with 6 wt.% CNTs showed a 9-fold increase in the conductivity. The starting epoxy resin is dielectric. The electrical resistivity data showed a percolation threshold between 0.5 and 2 wt.% CNTs loading. The temperature coefficient of electrical resistivity of the samples containing 2 wt.% in the temperature range from 20 to 60°C was 11.5·10-3 K-1. These results suggested that the conductivity of the CNTs-epoxy composites is improved, without any need for chemical functionalization of the nanotubes.
The present paper considers the effect of multi-walled carbon nanotubes (acting as a part of a silicon-organic composite) on the properties of a self-regulating electric heater. Flat electric heaters were manufactured with a heat exchange area of 1600 m2. The heater operating parameters were studied in the temperature range from -60°C to +70°C. The dynamics of the electric current consumed was investigated under self-regulation in the same temperature range It was revealed that when cutting the self-regulating heater into separate parts, the properties of self-regulation and power are maintained in proportion to the size.
The present paper discusses the possibility of simultaneously using two methods for the modification of multi-walled carbon nanotubes - high-temperature annealing and halogen-assisted modification. The nanotube modification was carried out during the high-temperature annealing in the presence of iodine. A change in the structure and an increase in the electrical conductivity of the modified multi-walled carbon nanotubes was observed.
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