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What are the effects of aging on the mechanical properties of polymeric materials?

Up to 70% of light stabilizers produced globally are used to protect polyolefins like polyethylene and polypropylene from photo-oxidation. This highlights the pervasive challenge of degradation, which begs the question: What are the effects of aging on the mechanical properties of polymeric materials, and how can these impacts be mitigated for long-term reliability and safety?