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In this study, the electrical and thermal conductivity of polyether ether ketone (PEEK)/carbon nanotubes (CNTs) with different types, namely whisker CNTs (Wh‐CNTs) and conventional CNTs were compared. PEEK/CNTs composites were melt mixed in PEEK via two screw extrusion technology. Moreover, the effects of different methods for mixing of PEEK/Wh‐CNTs, namely, dry mixing, wet mixing and melt mixing, were compared. The electrical and thermal properties were analyzed. A high thermal conductivity value of about 0.741 W/(m K) could be obtained upon loading with 10 wt% Wh‐CNTs and the PEEK/Wh‐CNTs composites had low volume resistivity value of 10.96 Ω cm at 10 wt% loading via melt mixing. Thermal conductivity values of 1.066 W/(m K) (out‐of‐plane) and 1.50 W/(m K) (in‐plane) were achieved with 10 wt% loading by wet mixing. Experimental results of out‐of‐plane thermal conductivity were more consistent with the Nan model. PEEK/Wh‐CNTs composites prepared by wet mixing exhibited higher thermal conductivity than the composites mixed using the two other methods. As the content of Wh‐CNTs in wet mixed PEEK/Wh‐CNTs nanocomposites increased, electromagnetic interference (EMI) shielding effectiveness (SE) was improved. The PEEK/Wh‐CNTs composites were 0.6 mm thick and showed an EMI SE of 21.5 dB.

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