In order to improve the thermal conductivity of 30 wt
% synthetic
graphite (SG)-filled polyketones (POKs), conductive fillers such as
multiwall carbon nanotubes (CNTs) and hexagonal boron nitride (BN)
were used in this study. Individual and synergistic effects of CNTs
and BN on 30 wt % synthetic graphite-filled POK on thermal conductivity
were investigated. 1, 2, and 3 wt % CNT loading enhanced the in-plane
and through-plane thermal conductivities of POK-30SG by 42, 82, and
124% and 42, 94, and 273%, respectively. 1, 2, and 3 wt % BN loadings
enhanced the in-plane thermal conductivity of POK-30SG by 25, 69,
and 107% and through-plane thermal conductivity of POK-30SG by 92,
135, and 325%. It was observed that while CNT shows more efficient
in-plane thermal conductivity than BN, BN shows more efficient through-plane
thermal conductivity. The electrical conductivity value of POK-30SG-1.5BN-1.5CNT
was obtained to be 1.0 × 10–5S/cm, the value
of which is higher than that of POK-30SG-1CNT and lower than that
of POK-30SG-2CNT. While BN loading led to a higher heat deflection
temperature (HDT) than CNT loading, the hybrid fillers of BNT and
CNT led to the highest HDT value. Moreover, BN loading led to higher
flexural strength and Izod-notched impact strength values than CNT
loading.