The presence of ultraviolet UV radiation can significantly affect the degradation and stability of polyethylene PE and polystyrene PS plastics. UV radiation, particularly in the range of 280-400 nm, can cause photo-oxidative degradation of these polymers, leading to a decrease in their mechanical properties, discoloration, and eventual disintegration.In the case of polyethylene, UV radiation can cause the formation of free radicals, which then react with oxygen to form peroxy radicals. These peroxy radicals can further react with the polymer chain, causing chain scission and the formation of carbonyl groups. This process leads to a decrease in the molecular weight of the polymer, embrittlement, and a reduction in tensile strength.Similarly, polystyrene is also susceptible to UV-induced degradation. The aromatic ring in the polystyrene structure can absorb UV radiation, leading to the formation of free radicals and subsequent oxidative degradation. This process can cause yellowing, embrittlement, and a reduction in the mechanical properties of the material.To minimize the degradation of polyethylene and polystyrene due to UV radiation, several strategies can be employed:1. Additives: Incorporating UV stabilizers, such as hindered amine light stabilizers HALS or UV absorbers, can help to protect the polymers from UV-induced degradation. These additives can either absorb the UV radiation or neutralize the free radicals formed during the degradation process.2. Coatings: Applying a protective coating, such as a UV-resistant paint or varnish, can help to shield the plastic from UV radiation and prevent degradation.3. Pigments: The use of pigments that can absorb or reflect UV radiation can also help to protect the plastic from degradation. For example, incorporating carbon black or titanium dioxide into the polymer can provide UV protection.4. Multilayer structures: Creating multilayer structures with a UV-resistant outer layer can help to protect the underlying plastic from UV radiation.5. Material selection: Choosing a plastic material with inherent UV resistance, such as high-density polyethylene HDPE or certain grades of polystyrene, can help to minimize degradation due to UV exposure.By employing these strategies, the degradation of polyethylene and polystyrene due to UV radiation can be minimized, resulting in the production of long-lasting plastic products.