The diffusion and solubility of Irganox® 1098 in polyamide 6

Diffusion coefficients (D) and solubilities (S) of a phenolic antioxidant (Irganox® 1098) in polyamide 6 were determined in the temperature range of 139-180 °C. D and S show Arrhenius and van't Hoff dependences on temperature respectively, with discontinuities at the melting temperature of the antioxidant. The activation energies for diffusion and enthalpies of solution are lower above than below the melting temperature. Based on the determined parameters for diffusion and solubility, the blooming of Irganox® 1098 as a function of temperature and time was calculated.