How does resin chain scission under UV exposure impact WPC flower box durability?

UV exposure significantly impacts the durability of Wood-Plastic Composite (WPC) flower boxes by causing resin chain scission, a form of polymer degradation. When WPC materials are exposed to sunlight, ultraviolet rays break the molecular bonds in the resin matrix, weakening the composite's structural integrity. This process leads to surface cracking, discoloration, and reduced mechanical strength over time.

The extent of damage depends on factors like resin type, UV stabilizer presence, and exposure duration. To mitigate these effects, manufacturers often incorporate UV-resistant additives or protective coatings. Understanding this degradation mechanism helps in designing longer-lasting WPC flower boxes for outdoor use. Regular maintenance and proper placement can also extend their service life despite UV challenges.