When polymer products exposed to air absorb oxygen oxidation , forming Hydroperoxide , further decomposition active center , forming free radicals, and then generating free radicals chain reaction (i.e Autoxidation Process). Oxidative degradation depends on polymer molecular structure There are differences. The presence of oxygen can also aggravate the damage of light, heat, radiation and mechanical force on the polymer, making it more complex Degradation reaction 。 Oxidative degradation is the main reason for the deterioration of the physical and mechanical properties of polymer products.
Add in polymer Antioxidant , which can slow down the oxidative degradation. 
