Improved Thermal Conductivity and Mechanical Property of PTFE Reinforced with Al2O3

To achieve polymer-based composites for electronic packaging with high thermal conductivity, Al 2 O 3 nanoplatelets were introduced into polytetrafluoroethylene (PTFE) matrix via a cold pressing and sintering method. The effect of mass content of the Al 2 O 3 platelets on the morphology, mechanical properties, thermal conductivity and dielectric properties of the composites was investigated. The results revealed that the Al 2 O 3 /PTFE nanocomposites exhibited higher thermal conductivities, better thermal stabilities, enhanced mechanical properties with considerable dielectric properties. The largest thermal conductivity of the Al 2 O 3 /PTFE nanocomposites filled with 25[Formula: see text]wt.% Al 2 O 3 platelets was 0.461[Formula: see text]W[Formula: see text]m[Formula: see text][Formula: see text]K[Formula: see text], increased by 85% compared with that of pure PTFE. The improved thermal conductivity of Al 2 O 3 /PTFE can be attributed to the formation of effective thermal conductance network within the PTFE matrix due to the interconnectivity of Al 2 O 3 platelets.