What are the effects of oxidation on the mechanical properties of PVC over time?

Oxidation significantly impacts the mechanical properties of PVC (polyvinyl chloride) as it ages, leading to material degradation and reduced performance. Over time, exposure to oxygen, UV radiation, and environmental stressors causes chain scission in the polymer structure, weakening its tensile strength and flexibility. This process results in increased brittleness, cracking, and loss of impact resistance, making PVC less durable in applications such as piping, construction, and industrial uses. Studies show that oxidized PVC exhibits lower elongation at break and reduced load-bearing capacity, compromising its long-term reliability. Preventive measures, including UV stabilizers and antioxidants, can slow oxidation, but prolonged exposure inevitably diminishes PVC's mechanical integrity. Understanding these effects is crucial for selecting appropriate materials in engineering and design.