Experimental demonstration of polymer matrix oxidation and validation of the oxidation model
Thermo-oxidation of binder (DMPE)
Demonstration of surface oxidation after 6-month ageing at 40ºC and 60º C but not at room temperature (homogeneous oxidation) using two different techniques.
Oxygen concentration profile using MEB/EDX (DMAS)
Oxygen concentration profile by elemental chemical analysis
External oxidation layer < 3 mm (approx. 10% of height)
Ageing at 60 °C
Conclusions
- Conformity of simulated profiles with SEM data
- Diffusion limited by oxidized surface layer
- Faster saturation at 60°C due to accelerated oxidation
