What role do coupling agents play in improving the adhesion between wood fibers and plastic in WPC?
Coupling agents play a critical role in improving the adhesion between wood fibers and plastic in Wood-Plastic Composites (WPC). These chemical additives act as a bridge, creating strong bonds at the interface of the hydrophobic plastic matrix and hydrophilic wood fibers. By modifying the surface properties of wood fibers, coupling agents enhance compatibility, reduce moisture absorption, and increase mechanical strength. Common types include silanes, maleic anhydride-grafted polymers, and isocyanates. Their application significantly boosts WPC performance, ensuring better durability, dimensional stability, and resistance to environmental factors. Understanding their function helps optimize WPC formulations for superior end-use applications.
