Differential thermal analysis of thermostable coating based on local raw materials

In this article, the thermal stability of the thermostable oligomer synthesized on the basis of local raw materials was investigated using the differential thermal analysis (DTA) method. Today, differential thermal analysis studies changes in many chemical substances under the influence of temperature. Differential thermal analysis was performed on a NETZSCH STA-409 PG TG-DSC analyzer equipped with a K-type (Low RG Silver) thermocouple and using aluminum pegs. In this device, the temperature measurement range was 20–900 °C at a heating rate of 10 K/min. The thermostable oligomer sample showed a strong thermal emission at a temperature of 537.4°C - an exothermic reaction associated with the maximum pyrolytic decomposition of the polymer took place at 700°C. The total mass loss of the oligomer during the thermal analysis period was 35.4%. When the temperature was 755 °C, the beginning of destruction with the length of simple S-S bonds (corresponding to the enthalpy of bonds) was observed, and the process continued until the ash formation ended. It was found that an endothermic effect was observed in the thermostable oligomer when the temperature reached 537.4°C, and then an exothermic effect was observed.

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