期刊
JOURNAL OF CELLULAR PLASTICS
卷 50, 期 6, 页码 551-562出版社
SAGE PUBLICATIONS LTD
DOI: 10.1177/0021955X14539778
关键词
Injection foam molding; polystyrene foams; chemical foaming; blowing agent; dielectric properties; carbon nanotube
资金
- Natural Sciences and Engineering Research Council (NSERC) of Canada
- Alberta Innovates Technology Futures (AITF)
This study investigated the impact of foaming on the broadband dielectric properties of multi-walled carbon nanotube/polystyrene (MWCNT/PS) nanocomposites. Different carbon nanotube concentrations were prepared by blending of a 20wt.% MWCNT/PS masterbatch and pure PS using a twin-screw extruder. A chemical blowing agent was used to foam the nanocomposites in a micro injection molding machine. Compression molding was applied to fabricate unfoamed nanocomposites for comparison purposes. Comparing the dielectric properties of unfoamed and foamed nanocomposites showed that foaming increased the percolation threshold, reduced DC and AC conductivities, widened the insulator-conductor transition window, and reduced the dissipation factor of the MWCNT/PS composites. These were attributed to deteriorated conductive network and inferior dispersion and distribution of MWCNTs coming from the presence of foam cells in the nanocomposites. The obtained results propose foaming as a promising technique to improve the dielectric properties of MWCNT/polymer composites.
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