Polyethylene (PE) is one of the most widely used thermoplastics due to its excellent electrical properties, ease of processing and mechanical properties. However, the usage of polyethylene where high temperature is required is limited due to its low glass transition temperature. In order to improve the thermal stability and mechanical properties of polyethylene, crosslinking method is frequently used in the literature. In this study, triallyl isocyanurate (TAIC) was used as coagent. The effect of TAIC loading level (0.5, 1 and 2 phr) on the mechanical, thermal, rheological and structural properties of two metallocene based low density PE (LLDPE-C6 and LLDPE-C8) was investigated. Di tert-butyl cumyl peroxide was used as a crosslinking agent. The peroxide (PRX) content was kept constant at 1 phr. LLDPE/TAIC/PRX compounds were prepared in an Xplore model microcompounder at a barrel temperature of 135°C. Crosslinking was carried out using a hot press under pressure of 15 MPa at 175°C. The samples were characterized by performing tensile tests, differential scanning calorimetry (DSC), scanning electron microscopy (SEM), rheology. The rheology test results show that storage modulus and complex viscosity of LLDPE/TAIC/PRX increased as coagent increased, indicating higher crosslinking degree. Tensile test results revealed that LLDPE/TAIC/PRX exhibited higher tensile strength and E-modulus values as compared to LLDPE/PRX.