What are the effects of freeze-thaw cycles on the mechanical properties of WPC outdoor tree boxes?
Freeze-thaw cycles significantly impact the mechanical properties of Wood-Plastic Composite (WPC) outdoor tree boxes. These cycles cause repeated expansion and contraction due to water absorption and freezing, leading to microcracks, reduced flexural strength, and compromised structural integrity. Studies show that prolonged exposure to freeze-thaw conditions decreases the tensile and impact strength of WPCs, making them more brittle over time. Additionally, moisture penetration accelerates fiber-matrix debonding, further weakening the material. To enhance durability, manufacturers often incorporate additives or surface treatments to minimize water absorption. Understanding these effects is crucial for designing long-lasting WPC tree boxes suited for cold climates.
