The flexible film of SCF/BN/PDMS composites with high thermal conductivity and electrical insulation

The flexible heat dissipation material with high thermal conductivity and electrical insulation is ideal for highly integrated flexible electronic devices. In this study, the flexible polymer composite films were prepared by spin coating process, the thermal conductivity and electrical insulation of the composite film are significantly enhanced by adding short carbon fibers (SCF) and boron nitride (BN) particles to PDMS matrix. SCF and BN particles construct an effective thermal conduction path in the PDMS matrix, while highly insulating BN particles inhibit the formation of conductive paths. The thermal conductivity of 15%SCF/20%BN/PDMS film achieved 2.29 W/iroK when 15 wt% SCF and 20 wt% BN were loaded, which was 990% enhancement compared to pure PDMS. And its volume electrical resistivity and breakdown strength reached 2.11 x 10145 Omega.m and 12.5 KV/mm respectively, showing excellent electrical insulation property.

Automated summary

By adding short carbon fibers and boron nitride particles to the PDMS matrix, the thermal conductivity and electrical insulation of the flexible polymer composite films were significantly enhanced, showing excellent electrical insulation properties. The combination of SCF and BN particles constructed an effective thermal conduction path while inhibiting the formation of conductive paths, leading to a 990% enhancement in thermal conductivity compared to pure PDMS.