Material CharacterisationQuantification of hindered phenols in polyamide 11 during thermal aging

Polyamide 11 films stabilized by Irganox® 1098, Irganox® 1010 or Irganox® 245 were subjected to thermal oxidation at 110 °C. The residual phenol content was assessed by comparing three analytical methods: high performance liquid chromatography (HPLC), determination of the Oxidation Induction Time (OIT) and Onset Oxidation Temperature (OOT) by thermal analyses. Both OIT and OOT are reliable for virgin PA11 after a relevant calibration by HPLC measurement. In the case of oxidized samples, OOT measurements have the benefits of being more easily interpretable than OIT and less time-consuming than HPLC measurements.