The surface-modified Al2O3 particles were introduced into polyethylene(PE) to enhance the thermal conductivity,and PE/Al2O3 cross-linked networks with improved thermal and mechanical properties were prepared through electron beam(EB) irradiation technology.The incorporation of reactive irradiation sensitizer was useful in fabricating a high degree of cross-linking(DC) PE networks under a low irradiation dose.In the PE sample containing 2％ sensitizer,DC ca.67.1％ could be obtained under 60 kGy(1 kGy=1000 J/kg).EB-irradiation greatly improved the tensile stress of PE-based samples,and the tensile stresses of the samples with 0.2％-5％ TMPTA(trimethylolpropane triacrylate) under 60 kGy were 24.61-27.77 MPa.All the EB-irradiated samples had higher Vicat softening temperatures than the samples without irradiation.After treatment at 120 kGy,the Vicat softening temperatures of PE-Al2O3-44/TMPTA-2 increased from 127 ℃ to 130.4 ℃.SEM images revealed that PE-Al2O3-50 samples with increased amount of Al2O3 particles showed a conduction “pathway,” and thermal conductivity reached 0.67 W/(m·K).Thus,high-performance pipes were extruded,which could satisfy the static hydraulic blasting test and exhibit improved thermal conduction capability.