Abstract
ABSTRACTThe effect of carbon fiber (CF) modification with multiwall carbon nanotube (CNT) on the electrical, mechanical, and rheological properties of the polycarbonate (PC)/CF/CNT composite was investigated. The CF and multiwall CNT (MWCNT) were treated with sulfuric acid and nitric acid (3:1 wt %) mixture, to modify the CF with the CNT. For the PC with acid‐treated CNT (a‐CNT) modified acid‐treated CF (a‐CF) (PC/a‐CF/a‐CNT) composite, the electrical conductivity, and the electromagnetic interference shielding effectiveness (EMI SE) showed the highest values, compared with those of the PC/a‐CF and PC/a‐CF/CNT composites. The EMI SE of the PC/a‐CF (10 wt %)/a‐CNT (0.5 wt %) composite was found to be 26 (dB at the frequency of 10.0 GHz, and the EMI SE was increased by 91.2%, compared to that of the PC/a‐CF composite at the same amount of total filler content. Among the composites studied in this work, the PC/a‐CF/a‐CNT composite also showed the highest values of relative permittivity (εr) and dielectric loss factor. The above results suggest that the CF modification with the a‐CNT significantly affected the electrical conductivity and EMI SE of the composite, and the hybrid fillers of the a‐CNT and a‐CF resulted in good electrical pathways in the PC/a‐CF/a‐CNT composite. © 2018 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2019, 136, 47302.
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