Structure changes of aligned carbon nanotubes in thermoplastics below percolation revealed by impedance spectroscopy
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In this study, poly(methyl methacrylate) (PMMA)/carbon nanotube (CNT) composite has been prepared using a melt-mixing procedure and an anisotropic filament has been extruded using a capillary rheometer. The electrical properties have been investigated using fast-Fourier transform impedance spectroscopy (FFT-IS), which allows to develop an equivalent circuit. The proposed electrical circuit contains two resistors and two capacitors, which mirrors the structure change of the CNTs in the composites. Some results are counter-intuitive but are explained by a novel microscopic model.
KeywordsMelt spinning Aligned CNTs Below percolation Impedance spectroscopy
- Qu M, Nilsson F, Schubert DW (2018) Novel definition of the synergistic effect between carbon nanotubes and carbon black for electrical conductivity. Carbon (submitted)Google Scholar