How does the addition of rubber particles improve the impact resistance of WPC outdoor trash cans?

The addition of rubber particles to Wood-Plastic Composite (WPC) materials significantly improves the impact resistance of outdoor trash cans through several key mechanisms. Firstly, rubber particles act as elastic components within the rigid WPC matrix. When the trash can is subjected to a sudden impact, such as being knocked over or hit, these rubbery domains absorb and dissipate a substantial amount of the impact energy. Instead of the energy concentrating and causing a crack in the brittle plastic/wood matrix, it is absorbed by the flexible rubber particles, which deform elastically. This process reduces the stress concentration at the tip of any potential micro-cracks, preventing them from propagating. Secondly, the rubber particles improve the material's toughness by increasing its ability to undergo plastic deformation before failure. This enhanced toughness makes the trash can less prone to shattering or cracking upon impact, especially in cold weather when standard plastics become more brittle. Furthermore, the incorporation of rubber can improve the interfacial compatibility between the wood flour and the plastic matrix, leading to a more homogeneous material with better overall mechanical properties. The result is a more durable and long-lasting outdoor trash can that can withstand the physical abuses common in public environments, from vandalism to accidental collisions, ensuring greater longevity and reduced maintenance costs.