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The results of a comparative analysis of the heat conductivity properties of polymer micro- and nanocomposites based on polyethylene obtained using methods based on the mixing of components in a dry form or a melt of a polymer matrix are submitted. For polyethylene, filled with carbon nanotubes and aluminum particles, data on the effect of methods of synthesis of composites on the values of percolation thresholds, the concentration dependence of the coefficients of heat conductivity, etc. are presented.

The results of experimental studies by the performed complex of thermophysical characteristics of created polymeric microand polycarbonate-based nanocomposites, which comprise from 0.2 to 10% carbon nanotubes and microparticles of aluminum are presented. Materials on the interpretation of the data based on the percolation theory are submitted. The possibilities of using of offered composites for the production of heat exchangers, focused on low-grade heat transfer and operating in hostile environments are previewed.