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Journal of Physical Studies 20(3), Article 3702 [6 pages] (2016)
DOI: https://doi.org/10.30970/jps.20.3702 FEATURES OF PERCOLATION TRANSITION IN NANOCOMPOSITES BASED ON POLYETHERS AND CARBON NANOTUBESE. A. Lysenkov1, V. V. Klepko2
1V. O. Sukhomlynskyi Mykolayiv National University, |
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The purpose of this work was to study the percolation phenomenon in the nanofilled systems from the fundamental point of view, using the scaling approach. The conductivity of the systems based on polyethers (polyethylene glycol, polypropylene glycol and polytetrehydrofuran) and carbon nanotubes is investigated using the method of impedance spectroscopy and analysed in the frame of the percolation theory. It is discovered that the dependence of conductivity of investigated systems shows percolation behavior. It is shown that the percolation threshold, which was observed in the range of the CNT content from 0.3\0 0.5\%, for the probed systems depends on the type of the polymeric matrix. The value of percolation thresholds is determinated using the alternative Chodak-Krupa approach and the theory of excluded volume. It has been established that the crystallinity of the polymeric matrix considerably influences the value of the percolation threshold. The percolation threshold is inversely proportional to the matrix crystallinity. The critical indices of conductivity ($t$ and $s$) were certain using the scaling approach. The value of the critical index $t$ varies in the range from 1.15 (for liquid polypropylene glycol) to 1.88 (for crystalline polyethylene oxide). It is discovered that the processes of a filler's aggregation, its high aspect ratio, and high conductivity of neat polymer matrix tend to play leading roles in the formation of a conductive percolation network.
PACS number(s): 73.61.Ph, 73.63.Fg