PHYSICOCHEMICAL AND THERMAL PROPERTIES OF NATURAL AGING EXPANDED POLYSTYRENE

The article contains the results of studies indicating irreversible physicochemical changes in the composition and structure of gas-filled polymers (using the example of expanded polystyrene) in the process of natural aging under the influence of environmental factors. The identified characteristic changes in the structure are associated with the destruction of the shells of the granules of the polymer material and the migration of the functional filler TiO2, which leads to a decrease in density and an increase in the amorphization of the polymer thermal insulation. The more open surface of naturally aged samples contributes to increased contamination of the surface zone of the thermal insulation: non-polymer particles (Cr, Cu, Ni, Pb, V, Zn, MgO, Sr, Fe2O3, etc.) have been found in the structure, which to varying degrees can affect the operational and fire hazard characteristics of the material. The degree of contamination and its chemical nature largely depend on the duration and conditions of operation of thermal insulation materials.

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