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Influence of selective dispersion of MWCNT on electrical percolation of in-situ polymerized high-impact polystyrene/MWCNT nanocomposites.
- Source :
-
Express Polymer Letters . 2014, Vol. 8 Issue 1, p15-29. 15p. - Publication Year :
- 2014
-
Abstract
- This work demonstrates a simple method to develop highly conducting high impact polystyrene (HIPS)/multiwall carbon nanotube (MWCNT) nanocomposites through selective dispersion of MWCNT in HIPS matrix. The method involves in-situ polymerization of polybutadiene containing styrene monomer in the presence of HIPS beads and MWCNT. A significantly lower percolation threshold value than ever reported for HIPS/MWCNT systems was obtained using unmodified unaligned MWCNTs. With the increase in HIPS bead content (at a particular MWCNT loading) in the HIPS/MWCNT nanocomposites, the conductivity value was increased, suggesting that the presence of HIPS beads acted as excluded volume that decreased the percolation threshold. An increase in electrical conductivity from 1.91·10-7 to 1.15·10-5 S/cm was evident, when the HIPS bead content was increased from 30 to 60 wt% at a constant loading of MWCNT (i.e. 0.6 wt%). The morphological investigation of the HIPS/MWCNT nanocomposites revealed that, the MWCNTs were selectively dispersed in the in-situ polymerized HIPS region, outside the HIPS beads, which resulted in the lowering of the percolation threshold to a lower value of 0.54 wt%. The morphology and electrical properties of the nanocomposites have been discussed in detail in the manuscript. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 1788618X
- Volume :
- 8
- Issue :
- 1
- Database :
- Academic Search Index
- Journal :
- Express Polymer Letters
- Publication Type :
- Academic Journal
- Accession number :
- 91828899
- Full Text :
- https://doi.org/10.3144/expresspolymlett.2014.3