Oxidative degradation after use

It has been known for some time that these redox reactions amoimt to a lowering of the activation energy of bimolecular peroxide decomposition. This decomposition by a redox couple (a transition metal in two oxidation states) will be a factor in bofti heat and light-induced oxidation. 

The temperatures in commercial composting are much higher than in a landfill, commonly above 70 C for some days and in excess of 60 °C for weeks. 

HDPE carrier bag/TDPA outdoor exposure carbonyl index = 0.31 after 59 days (with no TDPA, no embrittlement after outdoor exposure)  

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