RESEARCH OF ACTIVATION ENERGY OF THERMAL BREAKDOWN OF POLYMER COMPOSITES MODIFIED BY 4-AMINOBENZOIC ACID

Calculation of the effective activation energy of thermo-oxidative breakdown (E) of modified epoxy composite materials is carried out on the basis of thermogravimetric analysis using the Broido double logarithmic method. The maximum values of activation energy (E = 152.1 kJ/mol and 152.3 kJ/mol) were found experimentally for composite materials modified by 0.25 wt.% and 0.50 wt.% of 4-aminobenzoic acid, respectively. The values obtained indicate a significant effect of modifier on the activation energy of epoxy composite materials. The results found experimentally show the formation of relatively thermally stable intra- and intermolecular bonds, which indicates the improvement of cross-linking of epoxy composite macromolecules. Improving the cross-linking of epoxy composite macromolecules leads to an increase of thermal stability, which as a result, has an effect on increasing the materials durability.