Experimental study demonstrates enhanced thermal stability in gamma-irradiated carbomer 940, suggesting secondary crosslinking of residual unsaturated bonds.
Changes in the thermal properties of carbomer after gamma irradiation have been analyzed using differential scanning calorimetry and thermogravimetric analysis. A multistep mechanism of thermal degradation of the polymer has been revealed upon heating in the range from 25 to 500°C. The most intense polymer degradation occurs at temperatures above 270°C. Thermogravimetric analysis revealed a shift in the peaks on the differential thermogravimetric curves, a decrease in their area, and an increase in the thermal degradation temperature, confirming an increase in post-irradiation thermal stability. It can be hypothesized that the increase in carbomer thermal stability under high radiation doses is associated with a decrease in the number of unsaturated bonds of pentaerythritol allyl ether that are not involved in primary crosslinking. The obtained data expand our understanding of the processes occurring in polyacrylates under the influence of ionizing radiation. This study has implications for the development of polymeric materials with controlled thermal and radiation properties.
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Gorbunova et al. (2026) studied this question.
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