Abstract
The influence of polylactic acid/high-density polyethylene (PLA/HDPE) volume ratio on the microstructure, electrical resistivity, and electromagnetic interference (EMI) shielding effectiveness (SE) of 1.0 vol% carbon nanotube (CNT) filled PLA/HDPE composites were investigated. Also, the effect of CNT content on the electrical resistivity and EMI SE of 90/10, 50/50, and 10/90 PLA/HDPE blends were studied. The CNT/PLA composite showed superior electrical and EMI SE performance compared with the CNT/HDPE composite. In the PLA/HDPE blends, the nanotubes were selectively localized in the HDPE domain. The EMI SE and electrical conductivity increased with the decrease of HDPE volume fraction in the blend. The 90/10 PLA/HDPE blend exhibited electrical percolation at 0.25 vol% CNT compared to 1.0 vol% for the 10/90 PLA/HDPE blend. At 7.0 vol% CNT and higher, the EMI SE of the 50/50 PLA/HDPE blend showed marginally higher SE than the 90/10 PLA/HDPE blend. The EMI SE was found to be a function of the composite’s electrical resistivity and microstructure.
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