Electrical Properties of Imidazole-Modified MWNT/Polyphenylenesulfide Composites Prepared by Melt Mixing
- Electrical Properties of Imidazole-Modified MWNT/Polyphenylenesulfide Composites Prepared by Melt Mixing
- 장용균; 장필규; 김준경; 박민; 윤호규
- Electrical properties; carbon nanotubes; PPS; melt mixing; Electrical Conductivity; Imidazole; Melt Processing; Percolation Behavior
- Issue Date
- Journal of nanoscience and nanotechnology
- VOL 9, NO 7, 4180-4186
- The electrical conductivity of surface-modified multiwalled carbon nanotubes (MWNTs)/polyphenylenesulfide
(PPS) composites prepared by melt processingis measured as a function of
frequency with the MWNTs content and evaluated in terms of percolation behavior. The imidazoledithiocarboyxlic
acid (imidazole) is grafted from the oxidized MWNTs, and the results of surface
analysis, HRTEM and thermal analysis reveal that the MWNTs are successfully modified by imidazole.
Although the imidazole-modified MWNTs are most damaged during the modification reaction
of imidazole with carboxylic group onto the MWNTs as well as during the oxidation, so that
the modified MWNTs are significantly shortened, the imidazole modification of MWNTs enables
the PPS composites to have the lower percolation threshold and the higher electrical conductivity
than the oxidized MWNTs/PPS composites. It is recognized that the better dispersion of MWNTs
derived from the compatibility of PPS with sulfur moiety in the imidazole and the presence of N–H
groups which may act as an assistor of the electronic conduction and/or decrease the energy barrier
required for the charge carriers to hop from conducting clusters to neighbors contribute to the
enhancement of the electrical properties of the imidazole-modified MWNTs/PPS composites.
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