Enhanced Thermal Conductivity for PVDF Composites with a Hybrid Functionalized Graphene Sheet-Nanodiamond Filler

A new thermal conductive poly(vinylidene fluoride) (PVDF) composite has been developed via a hybrid functionalized graphene sheets (FGS)-nanodiamonds (NDs) filler by a simple solution method. The PVDF composite showed different thermal conductivities at different proportion of hybrid filler. The thermal conductivity of the composite was up to 0.66 W/m.K for a mixture containing 45 wt% hybrid filler, which is about 2-fold increment in comparison to the PVDF martrix. The PVDF composites consisting of 20 wt% hybrid FGS/ND filler at the weight ratio of 1:3 shows the best thermal stability. The electrical conductivity of composites was increased from 5.1 x 10(-15) S cm(-1) (neat PVDF) to 7.1 x 10(-7) S cm(-1) of the PVDF composite with 10 wt% hybrid filler.