کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1810986 | 1025575 | 2012 | 6 صفحه PDF | دانلود رایگان |
![عکس صفحه اول مقاله: Impedance study of polymethyl methacrylate composites/multi-walled carbon nanotubes (PMMA/MWCNTs) Impedance study of polymethyl methacrylate composites/multi-walled carbon nanotubes (PMMA/MWCNTs)](/preview/png/1810986.png)
The dielectric behavior of polymethyl methacrylate/multi-walled carbon nanocomposites (PMMA/MWCNTs) was investigated using impedance spectroscopy technique. The composites were prepared using melt mixing with MWCNTs loading ranging from 0.01 to 10 wt%. The experimental results showed that the measured impedance reflects the insulating behavior of the host material (PMMA) with no appreciable effects of the filler less than 8.5 wt%. However, for the sample containing 10 wt%, the calculated value of dc conductivity increases with increasing temperature from 2.0×10−6 (Ω m)−1 to attain a value of 4.8×10−6 (Ω m)−1 at 110 °C. The percolation threshold derived from the dielectric data was estimated to be higher than 8.5 wt% and lower than 10 wt%. A temperature dependent electrical relaxation phenomenon was only observed in the sample containing 10 wt% of MWCNTs. The frequency dependence of the ac conductivity data followed a power law.
Journal: Physica B: Condensed Matter - Volume 407, Issue 4, 15 February 2012, Pages 759–764