Effects of h-BN on the thermal and mechanical properties of PBT/PC/ABS blend based composites

Hexagonal boron nitride microplatelets (h-BNMPs) or h-BN microplatelets/h-BN nanospheres (h-BNNSs) hybrids-filled polybutylene terephthalate (PBT)/polycarbonate (PC)/acrylonitrile butadiene styrene (ABS) blends with a mass proportion of 7 : 2 : 1 were prepared. The use of h-BNMPs resulted in composites with higher enhancement than h-BN hybrid fillers in terms of thermal conductivity. The addition of h-BN hybrids (h-BNMPs and h-BNNSs at the weight ratio of 8 : 2) achieved highest enhancement of mechanical properties, adding 6 wt% h-BN hybrids achieved a 39% increase in notched impact strength and a 4.9% increase in tensile strength. Moreover, not only did the incorporation of h-BN hybrids significantly enhance the mechanical performance of composites, but it remarkably improved the thermal conductivity of composites. Nevertheless, the doping of h-BNMPs resulted in the decrease of mechanical properties, although it availably contributed to the rise of thermal conductivity compared to the neat PBT/PC/ABS matrices.