Abstract
Carbon black (CB)/ high-density polyethylene (HDPE)/polyaniline (PAni) functionalized multi-walled carbon nanotube (MWNT) hybrid nanocomposites were prepared by the combined solution and melt-mixing process. The influence of PAni-MWNTs on the positive temperature coefficient (PTC) characteristics of hybrid nanocomposites have been studied. The experimental results showed that the hybrid nanocomposites with small amount of PAni-MWNTs (0.50-0.75 wt%) have good conductivity at room temperature & PTC intensity was increased dramatically. The increase is possible because of the interaction between PAni and MWNTs which facilitates the charge transfer process. A noticeable PTC intensity was observed for hybrid nanocomposites near the melting point of HDPE. This is due to the significant volume expansion near the melting point of the HDPE in the presence of PAni-MWNTs and a sudden increase in the resistivity due to the disconnection of the conductive paths. Further PTC reproducibility of hybrid nanocomposites was greatly improved by introducing PAni-MWNTs.
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