What are the differences in oxidation resistance between PVC and polyethylene?

PVC (Polyvinyl Chloride) and polyethylene are two widely used plastics, but they exhibit significant differences in oxidation resistance. PVC contains chlorine atoms in its molecular structure, which provide inherent resistance to oxidation and degradation when exposed to UV light and harsh chemicals. This makes PVC more durable in outdoor and industrial applications.

On the other hand, polyethylene lacks chlorine and is more susceptible to oxidation, especially under prolonged exposure to sunlight and oxygen. However, additives such as stabilizers and antioxidants can improve polyethylene's resistance. High-density polyethylene (HDPE) generally performs better than low-density polyethylene (LDPE) due to its tighter molecular structure.

In summary, PVC offers superior natural oxidation resistance, while polyethylene requires additives for enhanced durability. The choice between the two depends on the specific environmental conditions and application requirements.