2 Pitch-based carbon fiber and graphene synergistically increase thermal conductivity of composites
Author Ye Ji Noh, Seong Yun Kim et al. published an article “Synergistic improvement of thermal conductivity in polymer composites filled with pitch-based carbon fiber and graphene nanoplatelets” in the Polymer Testing magazine，and the paper mainly studied the phenomenon that pitch-based carbon fiber and graphene synergistically increase the thermal conductivity of composite materials. They use powder mixing and the in-situ polymerization method to uniformly disperse the fillers of different shapes and sizes, and the reasons for the synergistic effect of the thermal conduction were mainly studied and attempted to optimize the thermal conductivity. It was found that composites containing 5% uniformly dispersed pitch-based carbon fibers and 15% graphene increase 82% in isotropic thermal conductivity and 183% in plane thermal conductivity compared to composites containing only 20% graphene microchips, also the composites containing 5% uniformly dispersed pitch-based carbon fibers and 15% graphene increase 65% in isotropic thermal conductivity and 74% in plane thermal conductivity compared to composites containing only 20% pitch-based carbon fiber. This thermal conductivity synergy is mainly due to the founded of an internal three-dimensional network structure that facilitates phonon transport and an effective heat conduction path between the pitch-based carbon fibers and graphene with specific ratio and size.