AI Article Synopsis
- The study explores the dielectric properties of PMMA composites filled with multiwalled carbon nanotubes (MWCNT) that have different outer diameters.
- It finds that composites with thicker nanotubes have a lower percolation threshold and higher dielectric permittivity below this threshold.
- The research highlights that the temperature dependence of the dielectric permittivity is influenced by beta relaxation in the PMMA matrix, with thicker nanotubes increasing the energy barrier for PMMA molecular rotation.
Article Abstract
The dielectric properties of Polymethylmetacrylate (PMMA) composites filled with CVD made multiwalled carbon nanotubes (MWCNT) of different mean outer diameters (d - 9 nm and 12-14 nm) were investigated at temperatures from 300 K to 390 K and in a wide frequency range (20 Hz-1 MHz). The percolation threshold is lower in composites with thick nanotubes. Below percolation threshold the dielectric permittivity was found also to be higher for composites with thicker carbon nanotubes. The temperature dependence of the complex dielectric permittivity of the investigated composites below percolation is mainly caused by beta relaxation in pure PMMA polymer matrix. The potential barrier for PMMA molecules rotation is higher in composites with thicker MWCNT and demonstrates non-monotonous concentration dependence.
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| http://dx.doi.org/10.1166/jnn.2014.8705 | DOI Listing |
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