This article discusses the study of the structure and physicochemical properties of polystyrene compositions filled with secondary kaolin. Physicochemical processes were studied by thermo graphic analysis. The article also talks about thermo graphic studies of experimental masses, which made it possible to establish the temperature ranges of exothermic and endothermic effects, the rate of sintering processes and the nature of its course over time. In this article, a study of the thermal conductivity of soot-filled compositions based on polystyrene and polyvinylidene fluoride. Also presented are the experimental results of studies of the dependences of the thermal conductivity of compositions based on polystyrene on the concentration of soot and on temperature. The presence of reversible structural rearrangements in polymer soot-filled compositions was found.