One of the main challenges in WPC production is to improve their mechanical properties (for structural applications such as Pallets) [14]. Because of the incompatible nature of wood particle-PE matrix, wetting and especially distribution of the particles in the matrix have profound effect on the strength [15]. When fractured, crack initiation and growth takes place at the weak interface of the wood particles and polymeric matrix. Employing a coupling agent improves interfacial bonding which results in a more efficient stress transfer between matrix and wood particles. In addition, lack of good adhesion gives rise to void creation between wood particles and polymeric matrix which promotes stress concentration and crack propagation. Many studies have been conducted to address this issue illustrated in Fig. 1